hydraulic control valve is a pipeline medium pressure as the power, which can adjust the opening and closing, the valve. It consists of a main Industrial Valves and attached catheter, needle valve, ball valve and pressure gauge, etc, depending on the purpose of use, function can be turned into a remote-controlled floating ball valve, relief valve, slow close check valve, flow controller, pressure relief valve, hydraulic electric control valves, emergency shut-off valve, etc. Pilot valve along with the change of liquid level and pressure of medium action, because the pilot valve is a lot of more phyletic, can be used alone or several combination, can give the main valve of water level and water pressure and flow rate of single and compound adjustment function. Similar to the main valve body cut-off valve, the valve fully open, the pressure loss is much larger than the other valve, and the opening the more loss coefficient and full close state, close to the surge, the bigger the valve diameter is more significant. Has the characteristics of the Industrial Valves, close to the disc movement speed, prone to the impact of water hammer, close to full close valve action as slowly as possible, so the throttle device can be installed on the disc. Another pilot valve throttling and action part of the set to avoid as far as possible the small diameter of orifice, in order to avoid congestion. When it is necessary to add filter, preventive maintenance, and set the by-pass pipe. Hydraulic control valve diaphragm type and piston type two kinds, the working principle of the same, is more than the downstream pressure difference, pilot valve control, make diaphragm ( The piston) Hydraulic differential operation, entirely by hydraulic automatic adjustment, so that the main valve disc fully open or fully closed or in a state of adjustment. When entering the diaphragm ( The piston) Of control room above the pressure downstream of the water is discharged into atmosphere, or low pressure area, lower part role in disc above and below the diaphragm of the pressure value is greater than the pressure value, and thus pushes the main valve disc to the fully open position: when entering the diaphragm ( The piston) Of control room above the pressure in the inlet pressure and export since the middle, the main valve disc is in a state of adjustment, adjust the position depends on the catheter needle valve and pilot valve in the system of joint control function. Pilot valve to open or close by the change of the downstream pressure of their own small valve port, thus changing the diaphragm ( The piston) Above the control room of the pressure value, control the regulation of the main valve disc position. Can be used for drinking water and industrial water supply system, fire control system.

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