Description

Working principle of hydraulic control valve

The hydraulic control valve is driven by the pressure difference △ p between the upstream and downstream of the pipeline system and controlled by the pilot valve, so that the diaphragm (piston) hydraulic differential operation is completely automatically adjusted by hydraulic pressure, so that the main valve disc is fully opened, fully closed or in the regulation state. When the pressure medium entering the control room above the diaphragm (piston) is discharged to the atmosphere or downstream low-pressure area, the pressure value acting on the bottom of the valve disc and below the diaphragm is greater than the pressure value above, Hydraulic Control Valve and the main valve disc is pushed to the fully open position by relying on the pipeline medium: when the pressure medium entering the control room above the diaphragm (piston) cannot be discharged to the atmosphere or downstream low-pressure area, The pressure above the diaphragm (piston) is greater than the pressure below, and the medium in the pipeline presses the main valve disc to the fully closed position; When the pressure value in the control room above the diaphragm (piston) is between the population pressure and the outlet pressure, the main valve disc is in the regulating state, and its regulating position depends on the joint control function of the needle valve and the adjustable pilot valve in the attached pipeline system. The Hydraulic Control Valve adjustable pilot valve can automatically adjust the opening of its own valve port through the downstream outlet pressure and with its change, so as to change the pressure value of the control room above the diaphragm (piston) and control the adjustment position of the main valve disc.

Hydraulic control valves can be divided into the following types according to their purpose.

1) Water level control valve. It mainly controls the water level in the pool and water tower.

2) Pressure reducing valve. It is a valve that reduces the higher inlet pressure to a required outlet pressure and automatically keeps the outlet pressure stable by relying on the energy of the medium itself.

3) Safety valve for water (pressure relief / holding valve). When the pressure in the water supply pipeline system exceeds the set pressure, the valve will automatically open for pressure relief to protect the pipeline safety.

4) Check valve. It is installed at the pump outlet of the water supply system to prevent medium backflow and eliminate water hammer.

5) Electric on-off valve. The solenoid valve is used as the pilot valve to remotely open and close the water supply pipeline system according to the electrical signal, which can replace the large electric device used to open and close the gate valve and butterfly valve, and realize remote control.

6) 400X Flow control valve. Limit the excessive flow to a predetermined value and reduce the upstream high pressure to the required downstream low pressure.

7) 800X differential pressure bypass balance valve. It is used between the water supply pipe, return pipe, water collector and water distributor of the air conditioning system to control the pressure difference between the water supply pipe, return pipe, water collector and water distributor as the set value.

8) 900X emergency shut-off valve. It is used in the parallel water supply system of fire water and domestic water to automatically allocate the water supply direction.

9) Jm744x diaphragm quick opening sludge discharge valve. It is installed outside the tank wall at the bottom of the sedimentation tank to remove sediment and dirt at the bottom of the tank.

10) Jm742x diaphragm bottom mud unloading valve. It is installed at the bottom of the sedimentation tank to discharge sediment and dirt at the bottom of the tank

Working principle of hydraulic electric control valve

When the Hydraulic Control Valve supplies water from the inlet end, the water flows through the needle valve and enters the main valve control room. When the solenoid pilot valve is opened, the water in the control room flows out through the solenoid pilot valve and ball valve. The opening of the ball valve is greater than that of the needle valve, the pressure in the main valve control room is very low, and the main valve is fully open.

When the Hydraulic Control Valve is closed, the water in the main valve control room cannot flow out. The control room pressurizes and pushes the diaphragm to close the main valve.

Main technical parameters of hydraulic electric control valve

Main parts and materials of hydraulic electric control valve

Connection dimensions of hydraulic and electric control valves