Hydraulic control valve is a water pressure control valve, which consists of a main valve and attached to the catheter, pilot valve, needle valve, ball valve and pressure gauge and other components, can be evolved into a remote control float valve, pressure relief valve, slow closing stop Valve, flow control valve, pressure relief valve, hydraulic electric control valve. Hydraulic control valve is divided into two types of diaphragm and piston, the same working principle, are the pressure difference between the upstream and downstream â–³ P as the driving force, controlled by the pilot valve, the diaphragm (piston) hydraulic differential operation, fully automatic adjustment by the hydraulic Main valve disc fully open or completely closed or in regulation. When the pressure into the control room above the diaphragm (piston) V-ball valve water is discharged to the atmosphere or the lower reaches of the lower pressure zone, the role of pressure in the bottom of the valve plate and the diaphragm pressure value is greater than the above, so the main valve disc Pushed to the fully open position; when the pressure into the control chamber above the diaphragm (piston) can not be discharged to the atmosphere or the low pressure zone downstream, the pressure acting above the diaphragm (piston) is greater than the pressure below, Main valve disc pressure to completely close the track-style ball valve position; when the diaphragm (piston) above the control chamber pressure value is between the inlet pressure and outlet pressure, the main valve disc is in regulation, the adjustment position depends on the catheter system In the needle valve and adjustable pilot valve joint control. Adjustable pilot valve through the downstream outlet pressure and with its changes to open or close its own small valve port, thereby changing the diaphragm (piston) above the control room pressure value, control valve plate valve position adjustment.
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