silent hydraulic pump free sample

Continuum pumps are used to pump fluids in a continuous flow. They are often used in industries such as the chemical, oil and gas industry, water treatment plants, and power stations as well as in forklifts, machine tools, and on boats.

These silent pumps’ helical rotors don’t trap any fluid volume. Continuum pumps run highly efficiently while still producing minimal sound, continuous flow can be maintained even at maximum operating speed. They produce exremely low vibrations and low pulsations, operating silently which helps to not disrupt operations and prevent noise pollution or complaints.

Pumps are a vital part of any water or wastewater project, and choosing the right one is an important decision. Continuum pumps are one of the most popular options because they offer a number of advantages over other types, such as centrifugal pumps. Here at Antech, we can help you choose the right pump for your project or application, we have a team of experts who have been supplying hydraulic equipment for many years and know all the ins and outs of it.

Here at Antech, we’re complete experts in everything to do with hydraulic engineering, as well as our team always being happy to help our existing customers, past customers, and potential future customers. We always provide fantastic customer service and our team is always here to provide advice and guidance when you need it. Simply use our contact form, email us, or call our number and you’ll be put through to a member of our fantastic sales team.

Gear pumps are widely used in applications ranging from injection-molding machines to wind-turbine power plants. The new QXEH Series internal-gear drive units from Bucher Hydraulics are said to offer a performance advantage over other gear pumps, thanks to several engineering features. These include:

According to Bucher Hydraulics engineers, this results in extremely quiet operation, precise controllability in highly dynamic reversing modes, and higher reliability and efficiency versus similar products from competing suppliers—as proven by benchmark tests conducted by several major injection-molding machine manufacturers. In addition, intrinsic low noise emissions and low flow pulsations lets OEMs save costs by eliminating the need for additional noise-reduction measures.

The free-running gear with pinion and sprocket in the non-compensated pump allows for simple and quick configuration over a wide pressure and speed range. The drive unit also has high hydraulic-mechanical efficiency. The non-compensated system exhibits low mechanical friction. Moreover, fluid feeds into the pump through internal cast-metal suction and pressure channels designed for low turbulence. Both features lower energy consumption.

The pump’s symmetric structure also helps ensure high operational reliability. This is particularly relevant in highly dynamic servodrives, where the pump briefly reverses to avoid pressure peaks. Enclosed in a precisely manufactured chamber, the QXEH Series units contain a free-running gear without sealing elements in the crescent, thus requiring no special backup pressure at the pump outlet. So the pump runs normally even in reverse mode with outlet pressures of up to 1 bar. This not only pays off through high drive-unit reliability but it also eliminates auxiliary valves that other pumps require to protect against failure in reverse operation—which reduces costs and energy losses.

For operation in a multi-quadrant mode, Bucher Hydraulics has developed a special design: The QXEM internal-gear drive unit. It also has a symmetric structure with identical high- and low-pressure areas, special metering grooves and lubrication systems, as well as two same-size pressure-tight connections. The design is optimized for two- and four-quadrant modes and is thus suited for rotation in both directions at high and low pressures.

The single-stage QXEH Series units are rated for pressures to 280 bar over a broad temperature, viscosity and speed range. Thus, they are suited for numerous applications. For example, according to Bucher officials, they offer high reliability and operational safety over millions of load cycles in injection-molding machines. They meet strict low-noise emission requirements in folding and bending machines. And press manufacturers are teaming QXEH pumps with variable-speed drives, permitting smaller and more cost-effective drives.

Highly dynamic servodrives can briefly reverse pump rotation to release pressure, thanks to a symmetric structure requiring no extra pressure-retaining valves.

The single-stage QXEH Series expands Bucher Hydraulics’ QX drive series, which is available with one to three stages and pressure levels from 125 to 400 bar.

Pulsations and noise can be captured inside the hydraulic power pack. Noise levels of 65 dBA can be achieved at 300 bar pressure. The TPD pulsation damper is one active part of the overall concept but there are also suction line technology and technology for sound traps in the ventilation system of power packs that helps achieve overall silence. PMC Hydraulics can offer a standard solution for silent power packs made in steel with one or more pump units equipped with electric motors ranging from 5,5 to 55 kW. Dampers are also often used in industrial press applications like extruding presses that work at high pressure for long periods of time.

Mobile pulsation dampingPulsations can create problems in mobile systems. One example is truck applications with pump units that run constantly at high pressure. Trucks that transports food with hydraulic refrigerator units are one example. This can create vibrations and noise inside the truck cabin. Another example is mobile equipment running very close to living areas in harbors or similar applications. The demands on low noise level can be very high in cities near living areas. Hydraulic piston pumps without damping can create a sound with a pulsation frequency that travel a great distance and that sound can reduced in by adding pulsation damping. Another focus area is the demand for low leakage in mobile machine applications with high concern for oil leakage to the environment.

The design key is the non-involute helical gearing, which uses its innovative tooth profile for continuous fluid delivery. This ensures virtually noiseless running of the pump while generating far fewer noise-exciting vibrations in the connected hydraulic system. The internal axial forces generated in the helical gearing are cancelled out in a wear-free manner using hydrostatic bearings. Use of SILENCE PLUS can for example reduce the total noise emission of a standard hydraulic power unit by 11 dB(A). At pressures up to 280 bar ,the new pump allows for increased operator comfort.

It wasn’t until the beginning of the industrial revolution when a British mechanic named Joseph Bramah applied the principle of Pascal’s law in the development of the first hydraulic press. In 1795, he patented his hydraulic press, known as the Bramah press. Bramah figured that if a small force on a small area would create a proportionally larger force on a larger area, the only limit to the force that a machine can exert is the area to which the pressure is applied.

Hydraulic systems can be found today in a wide variety of applications, from small assembly processes to integrated steel and paper mill applications. Hydraulics enable the operator to accomplish significant work (lifting heavy loads, turning a shaft, drilling precision holes, etc.) with a minimum investment in mechanical linkage through the application of Pascal’s law, which states:

The principle of Pascal’s law is realized in a hydraulic system by the hydraulic fluidthat is used to transmit the energy from one point to another. Because hydraulic fluid is nearly incompressible, it is able to transmit power instantaneously.

The purpose of the hydraulic reservoir is to hold a volume of fluid, transfer heat from the system, allow solid contaminants to settle and facilitate the release of air and moisture from the fluid.

The hydraulic pump transmits mechanical energy into hydraulic energy. This is done by the movement of fluid which is the transmission medium. There are several types of hydraulic pumps including gear, vane and piston. All of these pumps have different subtypes intended for specific applications such as a bent-axis piston pump or a variable displacement vane pump. All hydraulic pumps work on the same principle, which is to displace fluid volume against a resistant load or pressure.

Hydraulic valves are used in a system to start, stop and direct fluid flow. Hydraulic valves are made up of poppets or spools and can be actuated by means of pneumatic, hydraulic, electrical, manual or mechanical means.

Hydraulic actuators are the end result of Pascal’s law. This is where the hydraulic energy is converted back to mechanical energy. This can be done through use of a hydraulic cylinder which converts hydraulic energy into linear motion and work, or a hydraulic motor which converts hydraulic energy into rotary motion and work. As with hydraulic pumps, hydraulic cylinders and hydraulic motors have several different subtypes, each intended for specific design applications.

There are several components in a hydraulic system that are considered vital components due to cost of repair or criticality of mission, including pumps and valves. Several different configurations for pumps must be treated individually from a lubrication perspective. However, regardless of pump configuration, the selected lubricant should inhibit corrosion, meet viscosity requirements, exhibit thermal stability, and be easily identifiable (in case of a leak).

There are many variations of vane pumps available between manufacturers. They all work on similar design principles. A slotted rotor is coupled to the drive shaft and turns inside of a cam ring that is offset or eccentric to the drive shaft. Vanes are inserted into the rotor slots and follow the inner surface of the cam ring as the rotor turns.

The vanes and the inner surface of the cam rings are always in contact and are subject to high amounts of wear. As the two surfaces wear, the vanes come further out of their slot. Vane pumps deliver a steady flow at a high cost. Vane pumps operate at a normal viscosity range between 14 and 160 cSt at operating temperature. Vane pumps may not be suitable in critical high-pressure hydraulic systems where contamination and fluid quality are difficult to control. The performance of the fluid’s antiwear additive is generally very important with vane pumps.

As with all hydraulic pumps, piston pumps are available in fixed and variable displacement designs. Piston pumps are generally the most versatile and rugged pump type and offer a range of options for any type of system. Piston pumps can operate at pressures beyond 6000 psi, are highly efficient and produce comparatively little noise. Many designs of piston pumps also tend to resist wear better than other pump types. Piston pumps operate at a normal fluid viscosity range of 10 to 160 cSt.

There are two common types of gear pumps, internal and external. Each type has a variety of subtypes, but all of them develop flow by carrying fluid between the teeth of a meshing gear set. While generally less efficient than vane and piston pumps, gear pumps are often more tolerant of fluid contamination.

Internal gear pumps produce pressures up to 3000 to 3500 psi. These types of pumps offer a wide viscosity range up to 2200 cSt, depending on flow rate and are generally quiet. Internal gear pumps also have a high efficiency even at low fluid viscosity.

External gear pumps are common and can handle pressures up to 3000 to 3500 psi. These gear pumps offer an inexpensive, mid-pressure, mid-volume, fixed isplacement delivery to a system. Viscosity ranges for these types of pumps are limited to less than 300 cSt.

Today’s hydraulic fluids serve multiple purposes. The major function of a hydraulic fluid is to provide energy transmission through the system which enables work and motion to be accomplished. Hydraulic fluids are also responsible for lubrication, heat transfer and contamination control. When selecting a lubricant, consider the viscosity, seal compatibility, basestock and the additive package. Three common varieties of hydraulic fluids found on the market today are petroleum-based, water-based and synthetics.

Petroleum-based or mineral-based fluids are the most widely used fluids today. These fluids offer a low-cost, high quality, readily available selection. The properties of a mineral-based fluid depend on the additives used, the quality of the original crude oil and the refining process. Additives in a mineral-based fluid offer a range of specific performance characteristic. Common hydraulic fluid additives include rust and oxidation inhibitors (R&O), anticorrosion agents, demulsifiers, antiwear (AW) and extreme pressure (EP) agents, VI improvers and defoamants. Additionally, some of these lubricants contain colorful dyes, allowing you to easily identify leaks. Because hydraulic leaks are so costly (and common), this minor characteristic plays a huge role in extending the life of your equipment and saving your plant money and resources.

Elevated temperatures cause the water in the fluids to evaporate, which causes the viscosity to rise. Occasionally, distilled water will have to be added to the system to correct the balance of the fluid. Whenever these fluids are used, several system components must be checked for compatibility, including pumps, filters, plumbing, fittings and seal materials.

When choosing a hydraulic fluid, consider the following characteristics: viscosity, viscosity index, oxidation stability and wear resistance. These characteristics will determine how your fluid operates within your system. Fluid property testing is done in accordance with either American Society of Testing and Materials (ASTM) or other recognized standards organizations.

Viscosity (ASTM D445-97) is the measure of a fluid’s resistance to flow and shear. A fluid of higher viscosity will flow with higher resistance compared to a fluid with a low viscosity. Excessively high viscosity can contribute to high fluid temperature and greater energy consumption. Viscosity that is too high or too low can damage a system, and consequently, is the key factor when considering a hydraulic fluid.

Viscosity Index (ASTM D2270) is how the viscosity of a fluid changes with a change in temperature. A high VI fluid will maintain its viscosity over a broader temperature range than a low VI fluid of the same weight. High VI fluids are used where temperature extremes are expected. This is particularly important for hydraulic systems that operate outdoors.

Aside from these fundamental characteristics, another property to consider is visibiilty. If there is ever a hydraulic leak, you want to catch it early on so you don"t damage your equipment. Opting for adyed lubricant can help you spot leaks quickly, effectively saving your plant from machine failure.

When selecting lubricants, ensure that the lubricant performs efficiently at the operating parameters of the system pump or motor. It is useful to have a defined procedure to follow through the process. Consider a simple system with a fixed-displacement gear pump that drives a cylinder (Figure 2).

Collect all relevant data for the pump. This includes collecting all the design limitations and optimum operating characteristics from the manufacturer. What you are looking for is the optimum operating viscosity range for the pump in question. Minimum viscosity is 13 cSt, maximum viscosity is 54 cSt, and optimum viscosity is 23 cSt.

Check the actual operating temperature conditions of the pump during normal operation. This step is extremely important because it gives a reference point for comparing different fluids during operation. Pump normally operates at 92ºC.

Using the manufacturer’s data for the pump’s optimum operating viscosity, find the value on the vertical viscosity axis of the chart. Draw a horizontal line across the page until it hits the yellow viscosity vs. temperature line of the lubricant. Now draw a vertical line (green line, Figure 5) to the bottom of the chart from the yellow viscosity vs. temperature line where it is intersected by the horizontal optimum viscosity line. Where this line crosses, the temperature axis is the optimum operating temperature of the pump for this specific lubricant (69ºC).

Repeat Step 8 for maximum continuous and minimum continuous viscosities of the pump (brown lines, Figure 5). The area between the minimum and maximum temperatures is the minimum and maximum allowable operating temperature of the pump for the selected lubricant product.

Find the normal operating temperature of the pump on the chart using the heat gun scan done in Step 2. If the value is within the minimum and maximum temperatures as outlined on the chart, the fluid is suitable for use in the system. If it is not, you must change the fluid to a higher or lower viscosity grade accordingly. As shown in the chart, the normal operating conditions of the pump are out of the suitable range (brown area, Figure 5) for our particular lubricant and will have to be changed.

The purpose of hydraulic fluid consolidation is to reduce complexity and inventory. Caution must be observed to consider all of the critical fluid characteristics required for each system. Therefore, fluid consolidation needs to start at the system level. Consider the following when consolidating fluids:

Hydraulic systems are complicated fluid-based systems for transferring energy and converting that energy into useful work. Successful hydraulic operations require the careful selection of hydraulic fluids that meet the system demands. Viscosity selection is central to a correct fluid selection.