vane vs gear hydraulic pump quotation

With so many choices available for industrial pumps, the selection process often comes down to carefully evaluating the needs of the industry and choosing a pump that will be efficient and reliable in a specific application.

The case is no different when selecting sliding vane and rotary gear pumps. While both are types of positive displacement pumps, there are nuances that make one or the other better suited for a particular application.

A sliding vane pump uses a rotor with sliding vanes that creates suction between the vanes when the rotor rotates, thereby drawing the fluid behind each vane. The rotation carries the fluid between the inlet and the outlet. This type of construction allows sliding pumps to deliver constant flow under different pressure conditions.

While both sliding and rotary gear pumps are considered positive displacement pumps, the differences in their construction give them unique characteristics. Let us explore some of them in detail.

Sliding vane pumps have average performance in pumping viscous fluids. This is mainly because viscous fluids cannot easily enter the cavities formed within the pump. For pumping high viscous fluids, the speed of the sliding vane pumps must be lowered significantly.

Gear pumps, especially internal gear pumps, are great at handling viscous fluids. Their ability to work at slow speeds with minimal inlet pressure makes them ideal for viscous fluids.

Sliding vane pumps excel in pumping thin fluids. Their design makes it easier for the low viscosity fluids to enter the cavities. Therefore, the pump exhibits good suction capability.

Both gear and sliding vane pumps create pumping action with tight clearances. Pumping solids can significantly affect these clearances in a negative way, and the pumps can even lose their efficiency drastically.

Sliding vane pumps are better at handling wear. Since the vanes can be easily adjusted, these pumps are often referred to as wear adjusting pumps, where the pump automatically adjusts for the wear to maintain efficiency throughout its lifetime. If the wear becomes excessive to the degree that the pump cannot self-compensate, you can easily swap out the vanes.

Gear pumps wear at the meshing surface. A high degree of wear can introduce play between the meshing surfaces of the gears, causing the pump to lose its efficiency.

While both sliding vane pumps and rotary gear pumps have pros and cons, choosing between them depends largely on your specific fluid transport application. With over 40 application specialists on staff, Hayes Pump can help you find the right pumps for your requirements and have the setup running in no time.

You’ve heard about the difference between a vane pump and a gear pump, but not exactly know what it means. Well, this article is here to clear things up. Read on to learn more about the differences between these two types of pumps:

Gear pumps are better suited for high-pressure applications, while vanes can handle lower pressure. However, vane pumps are also used in higher-pressure applications as well.

A gear pump uses gears and a vane pump uses vanes to increase the flow rate of the liquid. A gear pump is built with a series of gears that spin around their axis at different rates. This creates a number of different patterns that allow for more fluid to pass through each gear than just one. The result is an increased flow rate for each gear because it has access to more volume.

Vane pumps use vanes which move toward and away from each other in order to create a larger area for fluid flow through. The overall design of a vane pump is similar to that of a gear pump but instead of using gears, it uses vanes which move toward and away from each other in order to create a larger area for fluid flow through.

Vane pumps have a unique design that allows them to pump more viscous liquids, such as honey, molasses and oil. They are also able to handle much higher flow rates than other types of pumps. Vane pumps are ideal for applications that require high-pressure or high-viscosity liquid pumping. In addition, they’re easier to clean than other types of pumps because they don’t need lubrication or seals.

In general, vane pumps have a larger diameter than gear pumps, but they have the same overall volume as a gear pump. This means they’ll be able to handle more volume at higher speeds and pressures than a gear pump would be able to do.

Vane pumps are typically more efficient at operating at low speeds because they rely on the rotation of their vanes rather than gears or other mechanisms that can reduce efficiency over time.

This is because the gear pump’s shaft is offset to allow it to be mounted in a larger diameter housing, which reduces the noise generated by the motor. The smaller diameter housing of a vane pump can cause it to vibrate excessively, thereby adding noise. However, vane pumps are also quieter than other kinds of pumps, including impeller pumps and centrifugal pumps.

Vane pumps are often used in applications where they need to be extremely quiet or where there are other concerns about vibration or humming caused by other types of motors or machinery. Vane pumps are also used in industrial applications where high pressure is required and there is no need for continuous power supply like that provided by a gear pump.

Gear pumps are typically used as a source of power for larger systems and for applications that require a high flow rate. They have many advantages, such as being able to deliver a high head (pressure) for a low flow rate. Because of their high efficiency, they are also used in the production of concrete, where they deliver a high head at low flow rates.

Vane pumps can produce much higher pressure than gear pumps. They do this by using a large diameter shaft with multiple vanes which rotate around it. This makes it possible to turn the pump shaft faster than with a gear pump and therefore achieve greater pumping speed without sacrificing efficiency.

Gear pumps are more efficient because they rotate at a constant speed, while vane pumps are not. When you put a gear pump in your system and it starts to spin up, it won’t increase the flow until it reaches its maximum rotational speed (which is slower than an impeller).

Vane pumps have a fixed volumetric efficiency that cannot be changed from the manufacturer’s spec. This means that as you increase the flow through your system, you may get less throughput per revolution of the pump.

Gear pumps are also more efficient, which means they can produce the same amount of horsepower at a lower cost. Gear pumps have advantages over vane pumps in that they can be used for both high- and low-pressure applications, and their construction is more durable than vane pumps. Vane pumps are generally more expensive, but they do have some advantages over gear pumps, such as being able to work at higher pressures.

Although they were not commonly used in the petrochemical industry until recently, they are now used extensively in this area. In addition to the traditional applications, vane pumps are also being applied as a motor for windmills and other machines that require a high output torque at low speed.

Vane pumps come in different forms such as axial piston vane pumps, radial piston vane pumps, centrifugal vane pumps, etc. The most common types of vane pumps are axial piston pump and radial piston pump.

Axial Piston Pump: This type of pump is used for water supply or waste water applications where the discharge pressure is relatively high and flow rate is relatively low. It consists of an enclosed rotor with a number of vanes arranged parallel to it. The arrangement of these vanes provides an efficient distribution of flow into the discharge line while maintaining its velocity in a vertical direction by using countercurrent flow technique.

A gear pump is a device used to transfer fluid from one place to another using a rotating shaft. They are designed to operate at low speeds and high pressures. A gear pump does not use a vane pump, but rather gear wheels or disc wheels to turn the shaft. Vane pumps are better for stationary applications, but gear pumps are best for portable equipment.

A vane pump has two parts: the impeller and the casing. The impeller is mounted on the shaft of the pump and has two vanes that spin around it. This type of pump has flow control by means of vanes that change in size as they rotate. A vane pump can work at any rotational speed, but it will deliver more power at higher speeds because its flow rate is greatest at these higher speeds.

Gear pumps have only one moving part, which is the shaft itself. We haven’t added any other internal parts to affect its operation; thus, you can spin as fast as you like if there aren’t any complications.

This blog post hopes to provide a brief, simple explanation of the difference between geared and vane pumps, and it was written with the hope that you can use this information as a guide to help you in the future. Happy reading!

The type of hydraulic pump you need depends on a variety of factors, including, but not limited to, the type of hydraulic fluid used in your machinery, operating pressure, application speed, and flow rate requirements.

Two of the most common pumps used in hydraulic equipment are piston pumps and gear pumps. This article will highlight everything you need to know about each pump, including its common uses and benefits.

A piston pump is a positive displacement pump that uses reciprocating motion to create rotation along an axis. Some piston pumps have variable displacement, while others have a fixed displacement design.

A hydraulic piston pump is capable of the highest pressure ratings and is commonly used to power heavy-duty lifts, presses, shovels, and other components.

The downside of piston pumps is that they are often more expensive (especially when compared to gear pumps). Still, their improved efficiency often makes them a better investment for long-term production.

Gear pumps use gears or cogs to transfer fluids. The cogs are tightly aligned to create suction as they draw liquid in and discharge it. The gears can be internal or external, depending on the application. Gear pumps are also positive displacement pumps, but they are always fixed displacement, so you would need separate pumps or valves to control the amount of displacement.

Gear pumps are known for being reliable and durable when they are well-maintained. Compared to piston pumps, they also don’t require as much maintenance and are typically more affordable. However, these pumps usually max out at 3000 PSI. While this is enough pressure to power some machinery, it may not have the power to operate large presses and other industrial equipment. A gear-style pump also lacks the ability to vary the displacement of your system.

Gear pumps are often used in low-pressure applications where dispensing high-viscosity liquids is required. They are typically used in the food and beverage, pulp and paper, and oil/chemical industries.

The primary difference between a gear pump and a piston pump is how they are designed. While both pumps need hydraulic fluid to generate mechanical power, a piston pump uses a piston to move liquid throughout the pump valves, while a gear pump uses cogs to move fluid throughout the pump.

Gear pumps are affordable for low-pressure applications (35 to 200 bar or 507 to 2900 PSI), while piston pumps are more efficient options for high-pressure applications. A piston pump is also a better option if you’re looking for a pump with a higher discharge rate. Lastly, a piston pump will provide the most efficiency if your application is high-speed.

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Gear pump in operation of the most important parts for each other meshing gear. Meshing driven gear and driven gear are installed in two parallel shaft, because the teeth into and out of mesh, the formation of the volume between the teeth to create suction and drainage effect.

The main working part of vane pump is the rotor with a number of sliding blades. When the rotor turns, because of the stator inner cavity contour line or the eccentric configuration of the rotor, the blade slides in the blade slot, resulting in the change of working volume, thus creating suction and drainage effect.

4. Rated discharge pressure has nothing to do with the size and speed of the working parts, mainly depends on the sealing of the gear pump and the bearing capacity of the parts.

1. Gear pump structure is more simple, reliable, low price; Blade pump structure is more complex, parts manufacturing accuracy requirements are higher, the blade is more easy to jam, to oil cleaning degree and viscosity more sensitive;

2. The gear pump with irreversible design can usually be reversed, but the suction orifice changes after reversal, and the relief valve of the pump does not work; Blade pump is generally not allowed to reverse;

3. The single-acting vane pump can be designed to change the eccentricity by moving stator at the same speed to achieve the purpose of changing the direction variable.

I’ll cut to the chase; the best days for the hydraulic vane pump are likely behind us but they’re not quite ready for extinction. Let me tell you why I feel this way. Just like much of technology from the early days of the twentieth century, the vane pump came about as inventors searched for “the better mousetrap.” There were many ways to create the pressure and flow required for a hydraulic system, and alongside the piston and gear pump designs, the vane pump turned out to be a fantastic option.

For many of the early decades, hydraulic systems could not function higher than 2,000 psi. This suited the vane pump perfectly, mainly the pressure-compensated vane pumps that arrived later in the game. The vanes take advantage of hydraulic pressure to force themselves against the cam ring to seal more effectively. However, as pressure rises, the force against those vanes becomes excessive, increasing friction and wear.

Vane pumps also benefited from a design allowing the cam ring to move radially relative to the shaft rotation. By attaching a pressure compensator to one side, an increase in pressure above the opposing bias piston’s spring force will result in the cam ring moving towards its center of rotation, effectively reducing pump displacement.

The pressure-compensated vane pump has dominated the machine tool industry, offering a quiet, somewhat efficient unit able to operate jaws or clamps at relatively low pressure. Even today, CNC machines everywhere use these pumps, their high demand maintaining their economical price point and quick delivery.

Advances in technology and materials helped the modern fixed-vane pump achieve performance over 5,000 psi. A combination of hardened steel, tighter tolerance and a pitch in vane angle gives the pump higher durability when exposed to the upper reaches of hydraulic pressure. However, variable displacement technology never caught on for these high-pressure pumps.

Most vane pumps are moderately priced, splitting the gap between the economical gear pump and the pricy piston pump. However, the vane pump’s modest advantages of low noise and slightly improved efficiency make them hard to justify over a gear pump, in most cases. As a result, their popularity has waned as consumers gravitated towards the inexpensive gear pump for low-end systems or the high-performance advantage of the piston pump.

Not all is lost for the vane pump, however. Besides their lock on the machine tool industry, they are ideally suited for other niches better than their counterparts. Hydrostatic bearings use hydraulic pressure to support large diameter or high-speed bearings, providing lubrication and a liquid bearing surface. The high-pressure fixed vane pump provides up to 5,000 psi in some applications while being quieter and less expensive than the piston pump option and offering better contamination resistance.

Fixed vane pumps have received more attention recently because, combined with closed-circuit drive systems, they provide a quiet and efficient closed-circuit pressure and flow control. Unlike the pressure compensated pump that reduces displacement to control pressure, the closed-circuit pump system uses pressure transducers to measure pressure, and then the PLC reduces the electric motor’s speed to exactly match the desired output pressure. With this type of technology behind it, the vane pump is not likely going away.

Gear pumps have very few moving parts. They consist of two intermeshing gears. These pumps have a constant flow rate. They operate at pressures generally between 50 and 210 bar. Gear pumps operate at the highest speeds of any pumps at up to 3000-6000 rpm.

In an external-gear pump, only one of the gear wheels, the drive gear, is connected to the drive. The other gear wheel, the driven gear, rotates in the opposite direction, so that the teeth of the rotating gear wheels interlock.

There are also double external-gear pumps, which combine two gear pumps driven by the same coupling shaft. A double external-gear pump has the advantage of supplying two independent hydraulic circuits, and also provides more flow to one circuit.

There are typically three types of hydraulic pump constructions found in mobile hydraulic applications. These include gear, piston, and vane; however, there are also clutch pumps, dump pumps, and pumps for refuse vehicles such as dry valve pumps and Muncie Power Products’ Live PakTM.

The hydraulic pump is the component of the hydraulic system that takes mechanical energy and converts it into fluid energy in the form of oil flow. This mechanical energy is taken from what is called the prime mover (a turning force) such as the power take-off or directly from the truck engine.

With each hydraulic pump, the pump will be of either a uni-rotational or bi-rotational design. As its name implies, a uni-rotational pump is designed to operate in one direction of shaft rotation. On the other hand, a bi-rotational pump has the ability to operate in either direction.

For truck-mounted hydraulic systems, the most common design in use is the gear pump. This design is characterized as having fewer moving parts, being easy to service, more tolerant of contamination than other designs and relatively inexpensive. Gear pumps are fixed displacement, also called positive displacement, pumps. This means the same volume of flow is produced with each rotation of the pump’s shaft. Gear pumps are rated in terms of the pump’s maximum pressure rating, cubic inch displacement and maximum input speed limitation.

Generally, gear pumps are used in open center hydraulic systems. Gear pumps trap oil in the areas between the teeth of the pump’s two gears and the body of the pump, transport it around the circumference of the gear cavity and then force it through the outlet port as the gears mesh. Behind the brass alloy thrust plates, or wear plates, a small amount of pressurized oil pushes the plates tightly against the gear ends to improve pump efficiency.

A cylinder block containing pistons that move in and out is housed within a piston pump. It’s the movement of these pistons that draw oil from the supply port and then force it through the outlet. The angle of the swash plate, which the slipper end of the piston rides against, determines the length of the piston’s stroke. While the swash plate remains stationary, the cylinder block, encompassing the pistons, rotates with the pump’s input shaft. The pump displacement is then determined by the total volume of the pump’s cylinders. Fixed and variable displacement designs are both available.

With a fixed displacement piston pump, the swash plate is nonadjustable. Its proportional output flow to input shaft speed is like that of a gear pump and like a gear pump, the fixed displacement piston pump is used within open center hydraulic systems.

As previously mentioned, piston pumps are also used within applications like snow and ice control where it may be desirable to vary system flow without varying engine speed. This is where the variable displacement piston pump comes into play – when the hydraulic flow requirements will vary based on operating conditions. Unlike the fixed displacement design, the swash plate is not fixed and its angle can be adjusted by a pressure signal from the directional valve via a compensator.

Vane pumps were, at one time, commonly used on utility vehicles such as aerial buckets and ladders. Today, the vane pump is not commonly found on these mobile (truck-mounted) hydraulic systems as gear pumps are more widely accepted and available.

Within a vane pump, as the input shaft rotates it causes oil to be picked up between the vanes of the pump which is then transported to the pump’s outlet side. This is similar to how gear pumps work, but there is one set of vanes – versus a pair of gears – on a rotating cartridge in the pump housing. As the area between the vanes decreases on the outlet side and increases on the inlet side of the pump, oil is drawn in through the supply port and expelled through the outlet as the vane cartridge rotates due to the change in area.

Input shaft rotates, causing oil to be picked up between the vanes of the pump which is then transported to pump outlet side as area between vanes decreases on outlet side and increases on inlet side to draw oil through supply port and expel though outlet as vane cartridge rotates

A clutch pump is a small displacement gear pump equipped with a belt-driven, electromagnetic clutch, much like that found on a car’s air conditioner compressor. It is engaged when the operator turns on a switch inside the truck cab. Clutch pumps are frequently used where a transmission power take-off aperture is not provided or is not easily accessible. Common applications include aerial bucket trucks, wreckers and hay spikes. As a general rule clutch pumps cannot be used where pump output flows are in excess of 15 GPM as the engine drive belt is subject to slipping under higher loads.

What separates this pump from the traditional gear pump is its built-in pressure relief assembly and an integral three-position, three-way directional control valve. The dump pump is unsuited for continuous-duty applications because of its narrow, internal paths and the subsequent likelihood of excessive heat generation.

Dump pumps are often direct mounted to the power take-off; however, it is vital that the direct-coupled pumps be rigidly supported with an installer-supplied bracket to the transmission case with the pump’s weight at 70 lbs. With a dump pump, either a two- or three-line installation must be selected (two-line and three-line refer to the number of hoses used to plumb the pump); however, a dump pump can easily be converted from a two- to three-line installation. This is accomplished by inserting an inexpensive sleeve into the pump’s inlet port and uncapping the return port.

Many dump bodies can function adequately with a two-line installation if not left operating too long in neutral. When left operating in neutral for too long however, the most common dump pump failure occurs due to high temperatures. To prevent this failure, a three-line installation can be selected – which also provides additional benefits.

Pumps for refuse equipment include both dry valve and Live Pak pumps. Both conserve fuel while in the OFF mode, but have the ability to provide full flow when work is required. While both have designs based on that of standard gear pumps, the dry valve and Like Pak pumps incorporate additional, special valving.

Primarily used on refuse equipment, dry valve pumps are large displacement, front crankshaft-driven pumps. The dry valve pump encompasses a plunger-type valve in the pump inlet port. This special plunger-type valve restricts flow in the OFF mode and allows full flow in the ON mode. As a result, the horsepower draw is lowered, which saves fuel when the hydraulic system is not in use.

In the closed position, the dry valve allows just enough oil to pass through to maintain lubrication of the pump. This oil is then returned to the reservoir through a bleed valve and small return line. A bleed valve that is fully functioning is critical to the life of this type of pump, as pump failure induced by cavitation will result if the bleed valve becomes clogged by contaminates. Muncie Power Products also offer a butterfly-style dry valve, which eliminates the bleed valve requirement and allows for improved system efficiency.

It’s important to note that with the dry valve, wear plates and shaft seals differ from standard gear pumps. Trying to fit a standard gear pump to a dry valve likely will result in premature pump failure.

Encompasses plunger-type valve in the pump inlet port restricting flow in OFF mode, but allows full flow in ON mode lowering horsepower draw to save fuel when not in use

Wear plates and shaft seals differ from standard gear pumps – trying to fit standard gear pump to dry valve likely will result in premature pump failure

Live Pak pumps are also primarily used on refuse equipment and are engine crankshaft driven; however, the inlet on a Live Pak pump is not outfitted with a shut-off valve. With a Live Pak pump, the outlet incorporates a flow limiting valve. This is called a Live Pak valve. The valve acts as an unloading valve in OFF mode and a flow limiting valve in the ON mode. As a result, the hydraulic system speed is limited to keep within safe operating parameters.

Outlet incorporates flow limiting valve called Live Pak valve – acts as an unloading valve in OFF mode and flow limiting valve in ON mode restricting hydraulic system speed to keep within safe operating parameters

After four years of growth, the Ghanian market for hydraulic pumps (gear or vane) and other rotary positive displacement pumps decreased by -32.3% to $X in 2021. Over the period under review, consumption, however, continues to indicate significant growth. As a result, consumption attained the peak level of $X. From 2015 to 2021, the growth of the market failed to regain momentum.

After two years of growth, overseas shipments of hydraulic pumps (gear or vane) and other rotary positive displacement pumps decreased by -47.2% to X units in 2021. Over the period under review, exports, however, continue to indicate perceptible growth. The most prominent rate of growth was recorded in 2020 when exports increased by 1,650%. As a result, the exports reached the peak of X units, and then shrank rapidly in the following year.

In value terms, exports of hydraulic pumps (gear or vane) and other rotary positive displacement pumps dropped sharply to $X in 2021. Overall, exports recorded a perceptible decrease. The most prominent rate of growth was recorded in 2020 with an increase of 1,793%. Over the period under review, the exports of attained the peak figure at $X in 2013; however, from 2014 to 2021, the exports remained at a lower figure.

South Africa (X units) was the main destination for exports of hydraulic pumps (gear or vane) and other rotary positive displacement pumps from Ghana, with a 96% share of total exports. It was followed by the United States (X units), with a 1.3% share of total exports.

In value terms, South Africa ($X) emerged as the key foreign market for hydraulic pump (gear or vane) and other rotary positive displacement pump exports from Ghana, comprising 64% of total exports. The second position in the ranking was held by the United States ($X), with a 6.9% share of total exports.

The average export price for hydraulic pumps (gear or vane) and other rotary positive displacement pumps stood at $X per unit in 2021, flattening at the previous year. Overall, the export price continues to indicate a abrupt decline. The most prominent rate of growth was recorded in 2013 an increase of 88%. Over the period under review, the average export prices attained the peak figure at $X per unit in 2014; however, from 2015 to 2021, the export prices failed to regain momentum.

After four years of growth, supplies from abroad of hydraulic pumps (gear or vane) and other rotary positive displacement pumps decreased by -35.3% to X units in 2021. Overall, imports, however, posted a strong expansion. The most prominent rate of growth was recorded in 2014 when imports increased by 2,769% against the previous year. As a result, imports reached the peak of X units. From 2015 to 2021, the growth of imports of failed to regain momentum.

In value terms, imports of hydraulic pumps (gear or vane) and other rotary positive displacement pumps declined to $X in 2021. Over the period under review, imports, however, recorded a significant increase. The pace of growth was the most pronounced in 2014 with an increase of 261% against the previous year. Over the period under review, imports of reached the peak figure at $X in 2020, and then contracted in the following year.

In 2021, the United Arab Emirates (X units) was the main hydraulic pump (gear or vane) and other rotary positive displacement pump supplier to Ghana, accounting for a approx. 100% share of total imports.

In value terms, the United Arab Emirates ($X) constituted the largest supplier of hydraulic pump (gear or vane) and other rotary positive displacement pump to Ghana.

In 2021, the average import price for hydraulic pumps (gear or vane) and other rotary positive displacement pumps amounted to $X per unit, surging by 33% against the previous year. In general, the import price enjoyed a remarkable increase. The pace of growth was the most pronounced in 2015 when the average import price increased by 674% against the previous year. Over the period under review, average import prices reached the maximum at $X per unit in 2019; however, from 2020 to 2021, import prices stood at a somewhat lower figure.

A vane pump is a self-priming positive displacement pump providing constant flow at varying pressures. Operation is via a motor connected to a gearbox as typically the maximum rpm is 900. The pump is fitted with a relief valve to prevent the pump from building to a pressure which may damage the pump.

The pump head is circular for the most part but has a flat portion as the vanes move in and out of the main rotor. The vanes will push out towards the casing due to the centrifugal force when the pump is in operation with forces exerting outwards keeping the vanes tight against the casing. When the vanes reach the outlet of the pump the casing is flatter and tighter against the rotor causing the vane to be pushed into the rotor and the fluid to expel through the outlet of the pump.

They are typically used for viscous fluids which are lubricating such as oils, petroleum’s, diesel, animal oils/blood, and fuel oil. They can also handle non-lubricating fluids such as solvents due to their being no metal to metal contact. Vane pumps self-compensate for wear meaning they can maintain peak performance without loss of flowrate.

Can handle viscous fluids up to 10,000cstPump requires a gearbox meaning pump can be larger / heavier than other designs and can also be less efficient due to mechanical losses through gearbox. Belt Driven designs can eliminate gear box

Heating chamber allows solidifying liquids to be kept at low viscosity and prevent solidification within the pumpLimited viscosity handling compared to other positive displacement pumps - maximum of 10,000cst

Vane Pumps self-compensate for wear. As vane tips wear they extend further out of the rotor ensuring efficiency is maintained. Other pump types lose efficiency as they wear

VP do not have metal to metal contact allowing pump to prime from dry but also strip containers, and handle non lubricating liquidsVP do not have metal to metal contact allowing pump to prime from dry but also strip containers, and handle non lubricating liquidsVP flow is maintained if viscosity is increased, whereas centrifugal pumps experience a drop in flow once outside designed duty point.

Gear pumps can have bearing or bushings in contact with fluid which can cause bearing lubrication issues with low lubricating fluidsLiquid ring pumps do not have as many sealing options.VP are self-priming by design.

Gear pumps are more precise for dosing or meteringVP typically have a lower NPSH requirementVP do not have metal to metal contact allowing pump to prime from dry but also strip containers, and handle non lubricating liquids

Hydraulic systems are in general members of the fluid power branch of power transmission. Hydraulic pumps are also members of the hydraulic power pack/hydraulic power unit family. Hydraulic units are encased mechanical systems that use liquids for hydraulics.

The hydraulic systems that hydraulic pumps support exist in a range of industries, among them agriculture, automotive manufacturing, defense contracting, excavation, and industrial manufacturing. Within these industries, machines and applications that rely on hydraulic pumps include airplane flaps, elevators, cranes, automotive lifts, shock absorbers, automotive brakes, garage jacks, off-highway equipment, log splitters, offshore equipment, hydraulic motors/hydraulic pump motors, and a wide range of other hydraulic equipment.

When designing hydraulic pumps, manufacturers have many options from which to choose in terms of material composition. Most commonly, they make the body of the pump–the gears, pistons, and hydraulic cylinders–from a durable metal material. This metal is one that that can hold up against the erosive and potentially corrosive properties of hydraulic fluids, as well as the wear that comes along with continual pumping. Metals like this include, among others, steel, stainless steel, and aluminum.

First, what are operating specifications of their customer? They must make sure that the pump they design matches customer requirements in terms of capabilities. These capabilities include maximum fluid flow, minimum and maximum operating pressure, horsepower, and operating speeds. Also, based on application specifications, some suppliers may choose to include discharge sensors or another means of monitoring the wellbeing of their hydraulic system.

Next, what is the nature of the space in which the pump will work? Based on the answer to this question, manufacturers will design the pump with a specific weight, rod extension capability, diameter, length, and power source.

Manufacturers must also find out what type of substance does the customer plan on running through the pumps. If the application calls for it, manufacturers can recommend operators add other substances to them in order to decrease the corrosive nature of certain hydraulic fluids. Examples of such fluids include esters, butanol, pump oils, glycols, water, or corrosive inhibitors. These substances differ in operating temperature, flash point, and viscosity, so they must be chosen with care.

All hydraulic pumps are composed in the same basic way. First, they have a reservoir, which is the section of the pump that houses stationary fluid. Next, they use hydraulic hoses or tubes to transfer this fluid into the hydraulic cylinder, which is the main body of the hydraulic system. Inside the cylinder, or cylinders, are two hydraulic valves and one or more pistons or gear systems. One valve is located at each end; they are called the intake check/inlet valve and the discharge check/outlet valve, respectively.

Hydraulic pumps operate under the principle of Pascal’s Law, which states the increase in pressure at one point of an enclosed liquid in equilibrium is equally transferred to all other points of said liquid.

To start, the check valve is closed, making it a normally closed (NC) valve. When the check is closed, fluid pressure builds. The piston forces the valves open and closes repeatedly at variable speeds, increasing pressure in the cylinder until it builds up enough to force the fluid through the discharge valve. In this way, the pump delivers sufficient force and energy to the attached equipment or machinery to move the target load.

When the fluid becomes pressurized enough, the piston withdraws long enough to allow the open check valve to create a vacuum that pulls in hydraulic fluid from the reservoir. From the reservoir, the pressurized fluid moves into the cylinder through the inlet. Inside the cylinder, the fluid picks up more force, which it carries over into the hydraulic system, where it is released through the outlet.

Piston pumps create positive displacement and build pressure using pistons. Piston pumps may be further divided into radial piston pumps and axial piston pumps.

Radial pumps are mostly used to power relatively small flows and very high-pressure applications. They use pistons arranged around a floating center shaft or ring, which can be moved by a control lever, causing eccentricity and the potential for both inward and outward movement.

Axial pumps, on the other hand, only allow linear motion. Despite this, they are very popular, being easier and less expensive to produce, as well as more compact in design.

Gear pumps, or hydraulic gear pumps, create pressure not with pistons but with the interlocking of gear teeth. When teeth are meshed together, fluid has to travel around the outside of the gears, where pressure builds.

External gear pumps facilitate flow by enlisting two identical gears that rotate against each other. As liquid flows in, it is trapped by the teeth and forced around them. It sits, stuck in the cavities between the teeth and the casing, until it is so pressurized by the meshing of the gears that it is forced to the outlet port.

Internal gear pumps, on the other hand, use bi-rotational gears. To begin the pressurizing process, gear pumps first pull in liquid via a suction port between the teeth of the exterior gear, called the rotor, and the teeth of the interior gear, called the idler. From here, liquid travels between the teeth, where they are divided within them. The teeth continue to rotate and mesh, both creating locked pockets of liquid and forming a seal between the suction port and the discharge port. Liquid is discharged and power is transported once the pump head is flooded. Internal gears are quite versatile, usable with a wide variety of fluids, not only including fuel oils and solvents, but also thick liquids like chocolate, asphalt, and adhesives.

Various other types of hydraulic pumps include rotary vane pumps, centrifugal pumps, electric hydraulic pumps, hydraulic clutch pumps, hydraulic plunger pumps, hydraulic water pumps, hydraulic ram pumps, portable 12V hydraulic pumps, hydraulic hand pumps, and air hydraulic pumps.

Rotary vane pumps are fairly high efficiency pumps, though they are not considered high pressure pumps. Vane pumps, which are a type of positive-displacement pump, apply constant but adjustable pressure.

Centrifugal pumps use hydrodynamic energy to move fluids. They feature a rotating axis, an impeller, and a casing or diffuser. Most often, operators use them for applications such as petroleum pumping, sewage, petrochemical pumping, and water turbine functioning.

Electric hydraulic pumps are hydraulic pumps powered by an electric motor. Usually, the hydraulic pump and motor work by turning mechanisms like impellers in order to create pressure differentials, which in turn generate fluid movement. Nearly any type of hydraulic pump can be run with electricity. Most often, operators use them with industrial machinery.

Hydraulic clutch pumps help users engage and disengage vehicle clutch systems. They do so by applying the right pressure for coupling or decoupling shafts in the clutch system. Coupled shafts allow drivers to accelerate, while decoupled shafts allow drivers to decelerate or shift gears.

Hydraulic ram pumps are a type of hydraulic pump designed to harness hydropower, or the power of water, to elevate it. Featuring only two moving hydraulic parts, hydraulic ram pumps require only the momentum of water to work. Operators use hydraulic ram pumps to move water in industries like manufacturing, waste management and sewage, engineering, plumbing, and agriculture. While hydraulic ram pumps return only about 10% of the water they receive, they are widely used in developing countries because they do not require fuel or electricity.

Hydraulic water pumps are any hydraulic pumps used to transfer water. Usually, hydraulic water pumps only require a little bit of energy in the beginning, as the movement and weight of water generate a large amount of usable pressure.

Air hydraulic pumps are hydraulic pumps powered by air compressors. In essence, these energy efficient pumps work by converting air pressure into hydraulic pressure.

Hydraulic pumps are useful for many reasons. First, they are simple. Simple machines are always an advantage because they are less likely to break and easier to repair if they do. Second, because fluid is easy to compress and so quick to create pressure force, hydraulic pumps are very efficient. Next, hydraulic pumps are compact, which means they are easy to fit into small and oddly shaped spaces. This is especially true in comparison to mechanical pumps and electrical pumps, which manufacturers cannot design so compactly. Speaking of design, another asset of hydraulic pumps is their customizability. Manufacturers can modify them easily. Likewise, hydraulic pumps are very versatile, not only because they are customizable, but also because they can work in places where other types of pump systems can’t, such as in the ocean. Furthermore, hydraulic pumps can produce far more power than similarly sized electrical pumps. Finally, these very durable hydraulic components are much less likely to explode than some other types of components.

To make sure that your hydraulic pumps stay useful for a long time, you need to treat them with care. Care includes checking them on a regular basis for problems like insufficient fluid pressure, leaks, and wear and tear. You can use diagnostic technology like discharge sensors to help you with detect failures and measure discharge pressure. Checking vibration signals alone is often not enough.

To keep yourself and your workers safe, you need to always take the proper precautions when operating or performing maintenance and repairs on your hydraulic pumps. For example, you should never make direct contact with hydraulic fluid. For one, the fluid made be corrosive and dangerous to your skin. For two, even if the pump isn’t active at that moment, the fluid can still be pressurized and may potentially harm you if something goes wrong. For more tips on hydraulic pump care and operation, talk to both your supplier and OSHA (Occupational Safety and Health Administration).

Pumps that meet operating standards are the foundation of safe and effective operations, no matter the application. Find out what operating standards your hydraulic pumps should meet by talking to your industry leaders.

The highest quality hydraulic pumps come from the highest quality hydraulic pump manufacturers. Finding the highest quality hydraulic pump manufacturers can be hard, which is why we have we listed out some of our favorites on this page. All of those whom we have listed come highly recommended with years of experience. Find their information nestled in between these information paragraphs.

Once you have put together you list, get to browsing. Pick out three or four hydraulic pump supply companies to which you’d like to speak, then reach out to each of them. After you’ve spoken with representatives from each company, decide which one will best serve you, and get started on your project.

Hydraulic Pumps are any of a class of positive displacement machines used in fluid power applications to provide hydraulic flow to fluid-powered devices such as cylinders, rams, motors, etc. A car’s power-steering pump is one example where an engine-driven rotary-vane pump is common. The engine’s gear-type oil pump is another everyday example. Hydraulic pumps can be motor-driven, too, or manually operated. Variable displacement pumps are especially useful because they can provide infinite adjustment over their speed range with a constant input rpm.

Pumps produce flow. Pressure is resistance to flow. Whereas centrifugal pumps can run against blocked discharges without building up excess pressure, positive-displacement pumps cannot. Hydraulic pumps, like any positive-displacement pump, thus require overpressure protection generally in the form of a pressure-relief valve. Over-pressure relief is often built into the pump itself.

Hydraulic systems are used where compact power is needed and where electrical, mechanical, or pneumatic systems would become too large, too dangerous, or otherwise not up to the task. For construction equipment, hydraulic power provides the means to move heavy booms and buckets. In manufacturing, hydraulic power is used for presses and other high-force applications. At the heart of the hydraulic system is the pump itself and the selection of a correct hydraulic pump hinges on just what the hydraulic system will be expected to do.

Axial piston pumps use axially mounted pistons that reciprocate within internal cylinders to create alternating suction and discharge flow. They can be designed as variable-rate devices making them useful for controlling the speeds of hydraulic motors and cylinders. In this design, a swashplate is used to vary the depth to which each piston extends into its cylinder as the pump rotates, affecting the volume of discharge. A pressure compensator piston is used in some designs to maintain a constant discharge pressure under varying loads.

Radial piston pumps arrange a series of pistons radially around a rotor hub. The rotor, mounted eccentrically in the pump housing, forces the pistons in and out of cylinders as it rotates, which cause hydraulic fluid to be sucked into the cylinder cavity and then be discharged from it. Inlets and outlets for the pump are located in a valve in a central hub. An alternative design places inlets and outlets around the perimeter of the pump housing. Radial piston pumps can be purchased as fixed- or variable-displacement models. In the variable-displacement version, the eccentricity of the rotor in the pump housing is altered to decrease or increase the stroke of the pistons.

Rotary vane pumps use a series of rigid vanes, mounted in an eccentric rotor, which sweep along the inside wall of a housing cavity to create smaller volumes, which forces the fluid out through the discharge port. In some designs, the volume of the fluid leaving the pump can be adjusted by changing the rotational axis of the rotor with respect to the pump housing. Zero flow occurs when the rotor and housing axes coincide.

External Gear pumps rely on the counter-rotating motion of meshed external spur gears to impart motion to a fluid. They are generally fixed-displacement designs, very simple and robust. They are commonly found as close-coupled designs where the motor and pump share a common shaft and mounting. Oil travels around the periphery of the pump housing between the teeth of the gears. On the outlet side, the meshing action of the teeth decreases the volume to discharge the oil. The small amount of oil that is trapped between the re-meshing gears discharges through the bearings and back to the pump’s suction side. External gear pumps are very popular in fixed-displacement hydraulic applications as they are capable of providing very high pressures.

The internal gear pump uses the meshing action of an internal and external gear combined with a crescent-shaped sector element to create fluid flow. The axis of the external gear is offset from that of the internal gear, and as the two gears rotate, their coming out of and into mesh create suction and discharge zones. The sector serves as a barrier between suction and discharge. Another internal gear pump, the gerotor, uses meshing trochoidal gears to achieve the same suction and discharge zones without needing a sector element.

This article presented a brief summary of some of the common types of hydraulic pumps. For more information on additional topics, consult our other guides or visit the Thomas Supplier Discovery Platform to locate potential sources of supply or view details on specific products.

In vane pumps, a number of vanes slide in slots in a rotor which rotates in a housing or ring. The housing may be eccentric with the center of the rotor, or its shape may be oval. In some designs, centrifugal force holds the vanes in contact with the housing, while the vanes are forced in and out of the slots by the eccentricity of the housing. In one vane pump, light springs hold the vanes against the housing; in another pump design, pressurized pins urge the vanes outward.

During rotation, as the space or chamber enclosed by vanes, rotor, and housing increases, a vacuum is created, and atmospheric pressure forces oil into this space, which is the inlet side of the pump. As the space or volume enclosed reduces, the liquid is forced out through the discharge ports.