Hydraulic pumps are essential components of hydraulic drive systems. They can be hydrodynamic or hydrostatic. Also, they convert mechanical energy into hydraulic power. The pumps operate by creating a vacuum at their pump inlet. It forces the liquid to flow from the inlet line into the pump.
Afterward, they channel the fluid to a pump outlet hence pushing it into a hydraulic system. Here are some five common hydraulic pumps.
The pumps are mean machines with fixed displacement and external teeth. Their swept volume ranges from 1-200 milliliters. Also, they have a low volumetric efficiency. Usually, gear pumps mesh the gear teeth to create pressure thereby causing the gear fluid to pressurize their outlet sides.
An ordinary gear pump requires some oil from its pressurized sides to lubricate it. It discharges it through the hydrodynamic bearings and releases it to the gears’ low-pressure side. Over time, the equipment wears down the housing hence needing replacement.
Rotary Vane Pumps
The pumps have a fixed and adjustable displacement. Also, they have relatively high efficiencies making them appropriate for mid pressures. However, modern rotary pumps can exceed 30,000kPa while operating.
Some models can alter the vane body’s center hence obtaining an adjustable pump. Customarily, such pieces of equipment are constant power or constant pressure pumps. They increase their displacement until they reach the ideal energy or pressure. Moreover, they decrease the swept volume until they attain equilibrium.
Screw pumps have a fixed displacement. They have two Archimedes’s screws that interlink inside a chamber. The machines are suitable for high flows with low pressure. Initially, they were useful in board ships whose constant hydraulic systems extended to the control ball valves. It aided in driving the ships’ steering gear. Although they produce little noise, the pumps have low efficiency.
Bent Axis Pumps
There are two varieties of bent axis pumps that use adjustable or fixed displacement; the Thoma principle that has a 25 degrees angle and the Wahlmark pumps whose pistons are spherical-shaped. They have a 40 degrees angle between their pistons and driveshaft centerlines.
Also, axis pumps have the highest efficiency. The large displacements are one liter per revolution. However, you can build a two-liter volume pump when you need it. Axis pumps have a working pressure of up to 420 bars.
Radial Piston Pumps
Radial pumps are fit for small flows with high pressure of about 650 bars. They have a distinct design that allows one to connect the plungers and the floating ring. You can use a control lever to move the pump’s floating ring horizontally. Also, you can alter the discharge by controlling the eccentricity. Moreover, one can reverse the discharge and suction.
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