The concept of hydraulic pneumatic control valve and species

the concept of control, hydraulic pneumatic valve, pneumatic hydraulic control valve is controlled hydraulic pneumatic valve, pneumatic valve and it consists of a main attached catheter, guide pneumatic valve, pneumatic valve, pneumatic ball valve and pressure gauge needle, etc.
the kinds of pneumatic, hydraulic control valve: depending on the purpose, function and place can be turned into a remote control float pneumatic valve, vacuum pneumatic valve, slow close check pneumatic valve, flow control, pneumatic valve, pneumatic valve, pressure, hydraulic electric control pneumatic valve, water pump control valve, etc. According to the structure can be divided into two categories, the diaphragm and piston.
type pneumatic, hydraulic control valve diaphragm and piston type two kinds of pneumatic valve working principle is the same, is more than the downstream pressure difference delta P, controlled by pneumatic valve guide, make diaphragm ( Piston hydraulic differential operation, entirely by hydraulic automatic adjustment, so that the main pneumatic valve pneumatic valve fully open or fully closed or in a state of adjustment.
when entering the diaphragm ( Of control room above the piston pressure downstream of the water is discharged into atmosphere, or low pressure area, effect in the pneumatic valve at the bottom of the dish above and below the diaphragm of the pressure value is greater than the pressure value, so will the Lord pneumatic valve pneumatic valve to the fully open position; When entering the diaphragm ( Piston pressure of control room above the downstream water cannot be discharged into atmosphere, or low pressure area, the diaphragm ( The piston at the top of the pressure value is greater than at the bottom of the pressure value, so will be the main pneumatic valve pneumatic valve plate pressure to the fully closed position; When the diaphragm ( Pressure value of control room above the piston in the inlet pressure and outlet pressure, the main pneumatic valve pneumatic valve plate is in a state of adjustment, adjust the position depends on its needle catheter system of pneumatic valve and adjustable guide joint control of pneumatic valve. Adjustable pneumatic valve can through the downstream outlet pressure and along with the change of it up or down its own small pneumatic valve port, thus changing the diaphragm ( The piston of control room above the pressure value, control of the pneumatic valve pneumatic valve position adjustment.