summa hydraulic pump pricelist

The tips of the vanes are the most vulnerable part of each pump. Because the vanes are held out under pressure and subject to centrifugal forces, the area where the tip moves across the outer ring is critical. Vibrations, dirt, pressure peaks or high local fluid temperatures can all result in a breakdown of the fluid film, resulting in metal to metal contact and reduced service life. With some fluids, the high fluid shear forces created at points like this can damage the fluid and again lead to reduced service life. Although this effect is not limited to vane pumps.

Suction head pressures are very important for vane pumps and must not exceed the manufacturers stated minimum. Always pre-fill the tank suction line and pump casing. It"s always better to make sure the installation has a positive suction head, e.g. the pump is below the fluid level, but never self-prime. Remember that as soon as you remove any valve or break the circuit in any way, it"s likely all of the fluid will drain out of the pipework and back into the reservoir. This will result in the need to re-prime any pumps that do not have positive pressure heads.

Case leakage lines allow all of the fluid that has leaked past the rotating faces to drain back to the reservoir. Without a case leakage line, the pumps would instantly fail. Because these case leakage lines take away the lost fluid, the volume and temperature of the fluid will be directly related to the operating efficiency of the pump. By monitoring the temperature of this fluid and preferably flow, and contamination level as well, you should get a good indication of the condition of the pump and an early warning of potential failures.

1.Cleanliness limits e.g. the level it needs from the system to work reliably and the best it will allow the system to run at, considering the duty at which it will work. Users should also consider what the consequences will be if the pump was to fail e.g. what would be the nature of the debris released during a typical failure. Does filtration need to be improved?

2.What is the minimum suction head requirement? Can pump suction conditions be improved, particularly when starting from cold? Will units operate at altitude which could increase potential issues.

3.What is the predicted life of the pump under the expected duty cycle? Remember that rated life predictions are based on normal operating conditions, which will not be the same for all installations. Have peak pressure or continuous pressure ratings been used?

7.Is planned maintenance appropriate e.g. is the fluid health checked or could it be damaged by aging or local operating conditions, therefore, reducing the life of the pump? Can the temperature of the case leakage line be monitored as a way of predicting pump damage?

10.Does the pump require a separate case leakage line? And if so what is the maximum pressure permitted. It"s always recommended to have a motor case leakage line even it the pump version doesn"t. Motor return lines are likely to exceed shaft seal limits and therefore without a drain line, high case pressures will cause seal failures or reduced life.

A hydraulic pump is a mechanical power source which converts mechanical power into hydraulic energy. A hydraulic pump does not create energy, but converts energy into a form which can be utilized by the hydraulic system. Although pumps come in various shapes & sizes with different pumping mechanisms, their sole purpose is to convert the mechanical energy of the prime mover ( eg. an electric motor) into hydraulic enerqy. They do this simply by pushing hydraulic fluid into the systemHydraulic pumps convert mechanical energy  (torque speed ) into hydraulic energy (flow, pressure)

In most industrial hydraulic systems, the prime mover is an electric motor. The rotary motion of the prime mover creates a flow of fluid from the outlet of the pump.

There are two types of displacement: a fixed displacement pump is a positive displacement design in which the amount of the displacement cannot be  varied. At a given input RPM, the pump must deliver flow in an amount equivalent to its fixed displacement, on the other hand, a variable displacement is a type of pump which its displacement can be changed easily.

In general all three design classification are applicable to fixed displacement pumps. However only the vane or piston type can be used for variable displacement.

A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for hydraulic fluid power applications.

A global leader in hydraulic pump design and manufacturing was approached by SPIROLShims regarding their use of shims. They were interested in changing their existing program with the goals of improving quality, having consistent supply and reducing overall cost.

Hydraulic pumps serve virtually every industry in manufacturing and technology applications such as chemical plants, automotive engineering, marine / offshore projects, railway engineering, civil water facilities and many other industrial applications.

The precision steel shims used in hydraulic pumps are engineered to be durable and meet extremely tight tolerances. Shims account for the variation in the pumps components for precise fit and proper bearing load.

Shims used in hydraulic pumps are manufactured to precise hardness specifications and dimensional tolerances to ensure proper long lasting functionality.

Thickness tolerance (to .0004 inch), flatness and parallelism are important for the correct shim selection based on the assembly measurements. Precise fit is needed for optimum pump functionality and durability.

The rough blanks still needed be ground to specified thickness. This was done on-site at the pump manufacturer. The grind operation was not part of their core business, was costly and slowed down the assembly lines. The hydraulic pump manufacturer wanted to remove grind operations from their facility.

The SPIROL Shims sales engineer worked closely with the pump manufacturer to determine the part"s requirements, program scope and the goals of improving quality and availability while reducing overall program costs.  After careful review and project development, SPIROL Shims was able to offer a program that addressed all of their goals.

The SPIROL proposal for the large shim program allows the pump manufacturer to focus on its core business of hydraulic pump production and not managing a time consuming shim program.

In summary, SPIROL Shims is now producing the entire package of shims for the hydraulic pump manufacturer. The shims are manufactured as complete parts with superior quality, improved availability and at a significant costs savings.

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.

Suction shoe pumps maintain high-volumetric efficiency, even at elevated pressures. Additional benefits include near-zero slip for accurate metering, long life, and more stable performance as pump components wear or thermally expand.

The suction shoe pump, unlike any other gear pump on the market, self adjusts on the job for reliable, pulseless flow, and features easier maintenance with less downtime than standard pumps.

Centrifugal pumps offer a reliable, simple, long-lasting design for higher flow applications. Using the unique magnetic drive technology, centrifugal pumps provide excellent chemical resistance and energy-efficient fluid delivery. Integrated impeller and magnet assemblies reduce the number of rotating parts to maximize pump life.

Centrifugal pumps consist of an impeller rotating within a casing. Liquid directed into the center of the rotating impeller is picked up by the impeller vanes and accelerated to a high velocity. When the liquid in the impeller is forced away from the center of the impeller, a reduced pressure is produced and consequently more liquid flows forward. There is no closed volume, as in a positive displacement pump, therefore producing a steady flow through the impeller. The pump basically increases the Bernoulli head of the flow between the eye and the exit of the pump.