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The Mechanism of Hydraulic Control Valve

by Adamant Valves

1. The concept of hydraulic control valve: hydraulic control valve is a kind of valve that is controlled by water pressure. It consists of a main valve and other accessories such as conduit, pilot valve, needle valve, sanitary ball valve and pressure gauge.

hydraulic control valve
2. The type of hydraulic control valve: according to different purposes of use, functions and occasions of use, there are remote control float valve, pressure relief valve, slow closing check valve, flow control valve, hydraulic electric control valve and water pump control valve. According to the structure, it can be divided into diaphragm type and piston type.

hydraulic control valve
3. The diaphragm type and piston type of hydraulic control valve share the same mechanism. They both use the pressure difference between upstream and downstream as power. They are controlled by pilot valve to make the diaphragm (piston) perform hydraulically differential operation, which is completely automatically adjusted by hydraulic power, so that the main valve disc is fully open or fully closed or in regulation state. When the pressure water entering the upper control chamber of diaphragm (piston) is discharged to the atmosphere or downstream low pressure zone, the pressure on the bottom of the valve disc and diaphragm is larger than the pressure on the top, pushing the main valve disc to fully open position. When the pressure water entering the upper control chamber of diaphragm (piston) can’t be discharged to the atmosphere or downstream low pressure zone, the pressure on the top of the valve disc and diaphragm is larger than the pressure on the bottom, pushing the main valve disc to fully closed position. When the pressure in upper control chamber of diaphragm (piston) is between the inlet pressure and outlet pressure, the main valve disc is in regulated state and its position of adjustment depends on the joint control effect of the needle valve and adjustable pilot valve of conduit system. Adjustable pilot valve can use the downstream outlet pressure to enlarge or tighten the valve opening, thereby changing the pressure value in upper control chamber of diaphragm (piston) and controlling the adjustment position of main valve disc.


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