How does a variable displacement pump work?
The variable displacement pump converts mechanical energy(rotation of motor or engine) to hydraulic energy. That is, conversion from hydraulic energy to mechanical energy(the function of the hydraulic motor). The flow rate and outlet pressure of the variable displacement pump can be changed during its operation.
How do you adjust a piston pump?
Observe the pressure gauge and use a 1/8 inch Allen wrench and slowly turn the adjustment screw to obtain the desired pressure setting. Clockwise rotation of the adjustment screw will increase the pressure setting and counter- clockwise rotation will decrease the pressure setting.
How do you control variable displacement pump?
The amount of flow that each pump can provide is dependent on a rotating group of pistons. By varying the stroke of the pistons, we adjust the displacement of the pump. In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate.
What is meant by variable displacement pump?
A variable displacement pump is a device that converts mechanical energy to hydraulic (fluid) energy. The displacement, or amount of fluid pumped per revolution of the pump’s input shaft can be varied while the pump is running.
Does a pump need back pressure?
Backpressure valves are required when a low-pressure injection point is hydraulically lower than the feed tank. Long pipe runs between the pump and injection point may need pulsation dampeners to reduce water hammer or pressure spikes caused by acceleration of the liquid in the discharge line.
What should the differential pressure be on a PAVC pump?
PROCEDURE: a. Standard Pressure Compensated Pump Pumps are shipped from factory with a differential pressure of approximately 150 PSI (10 bar) on PAVC 33/38/65, PAVC 100 is 300 PSI (21 bar) at 50% of maximum swash angle. Differential pressure will not normally change through the life of the pump.
How does PAVC 33 / 38 / 65 piston pump work?
Introduction Series PAVC 33/38/65/100 General Description All control is achieved by the proper positioning of the swash plate. This is achieved by a servo piston acting on one end of the swash plate working against the combined effect of the off-setting forces of the pistons and centering spring on the other end.
How can I remote control a PAVC pump?
Remote control of the PAVC output pressure can be achieved by controlling the pressure in the low signal “B” port when the pump is set up for Control Type (M). A manual, hydraulically piloted, electrical or electro- proportionally controlled pressure control device is installed in the line from the low signal “B” port to tank.
How is the swash plate of a PAVC pump controlled?
Control Options Series PAVC 33/38/65/100 Pressure Compensated Control Swash plate angle controls the output flow of the pump. Swash plate angle is controlled by the force generated against the swash plate by the pumping pistons and by the force of the servo piston.
