Wenzhou Prance Hydraulic Equipment Co., Ltd
A hydraulic valve flow rating is meaningful only with its stated pressure drop, fluid, viscosity, temperature, spool path, and duty. A catalog's nominal flow is not a promise that every metering path will pass that flow with acceptable loss
Open center vs closed center hydraulics describes what the supply path does when directional valves are neutral. An open-center valve provides a low-pressure path toward tank for a compatible fixed-displacement supply. A closed-center valve
A hydraulic motor counterbalance valve meters outlet flow so an overrunning load cannot drive the motor uncontrolled. Pilot pressure opens the valve during commanded motion, while the setting maintains enough resistance to stabilize the loa
A hydraulic motor crossover relief valve connects one motor work port to the other when differential pressure exceeds its setting. It can limit shock during reversal or deceleration, but it does not automatically provide controlled overrunn
Hydraulic motor efficiency calculation separates volumetric efficiency, mechanical efficiency, and overall efficiency. Volumetric efficiency compares actual speed with the speed predicted from inlet flow and displacement; mechanical efficie
Hydraulic pump destroke testing checks whether a variable-displacement pump reduces output when its control condition is reached. The test must observe pressure, flow, case drain, temperature, command state, and circuit demand together; pre
The load sensing vs pressure compensated pump choice changes how a variable pump decides its displacement. A pressure-compensated pump responds to outlet pressure alone, while a load-sensing control compares pump pressure with a remote load
Hydraulic pump pressure pulsation is the repeating pressure variation created as pumping chambers connect to the outlet and the circuit responds. Its amplitude depends on pump geometry, operating point, trapped-volume timing, fluid compress
Hydraulic pump torque calculation converts displacement and pressure into the shaft torque a prime mover must supply. The theoretical relationship is torque = pressure × displacement ÷ 2π; practical sizing must then account for mechanical e
The proportional valve vs servo valve decision is a system-level choice. Both meter hydraulic flow in response to an electrical command, but servo valves usually target higher dynamic response and tighter control with stricter fluid-cleanliness and c
A load sensing hydraulic valve sends a signal representing the highest active load back to a compatible variable pump. The pump then supplies enough pressure to overcome that load plus a control margin. When properly sized and compensated, this arran
A hydraulic valve power-beyond port carries pressurized carryover flow to a downstream valve, while the tank port returns exhaust and leakage flow at low pressure. They are not interchangeable. A power-beyond sleeve separates the high-pressure carryo