Technical characteristics and working principle of pneumatic valve to relieve stress

, QPF - F type pneumatic pneumatic valve, pneumatic valve is also called the decompression balance used in pneumatic circuit, adjusted for compressed air pressure value, make the set pressure value to a constant.
, the pneumatic valve is a pressure regulating - The overflow combination pneumatic valve. When the outlet pressure is lower than the set pressure, the pressure regulating the function of the pneumatic valve, pressure rise to set. When the outlet pressure is higher than the set pressure, the overflow of the pneumatic valve role, make the outlet pressure drops to the set pressure. To guarantee the stability of outlet pressure is always in need of set pressure.
, due to the pneumatic valve at the same time has a pressure regulating characteristics of the pneumatic valve and relief valve, it can also replace regulating pneumatic valve, pneumatic valve and the overflow ratio in the gas circuit system regulating alone setting pneumatic valve, pneumatic valve and the overflow system simple and compact structure. Also eliminates the pressure regulating pneumatic valve and relief valve set pressure difference between, can guarantee the air pressure in the system more accurately adjust and set to the desired steady value.
, the pneumatic valve as part of the combined with pneumatic pressure regulating the overflow of outlet pressure feedback of pneumatic valve, without a pilot signal input, in a normally closed state. When the guide gas circuit compressed air into the chamber B, the pneumatic valve start to work. The output pressure of the high and low, by entering the forerunner port CP air pressure to control, through adjusting the pressure to set the outlet pressure. Controlled by CP into the mouth cavity compressed air, B forces the pistons to along with its pneumatic valve core move upward along the axial direction, to overcome the spring force, make its compression. When the pneumatic valve pneumatic valve core of the overflow mouth ( On the face after contact with the underside of pneumatic valve cover completely, the output and the overflow channel is blocked. Continues to move up, pneumatic piston valve core will build up along the axial pneumatic valve, pneumatic compression, the spring on the valve cover and the regulating pneumatic valve is opened, the input cavity and output cavity connected input cavity compressed air through regulating mouth into the output cavity, the output port OUT. Output on the compressed air by the pneumatic valve body cavity of A C and gas path into A cavity. A cavity in the body of the gas pressure is the same.
and when the output pressure is lower than the set value, the piston is greater than the upper side of the force, under the piston moving up, push the pneumatic valve cover up, the pressure regulating pneumatic valve mouth, by regulating the pneumatic valve mouth into the output cavity compressed air flow increased, the output cavity pressure. When the pressure reach setting of the output cavity, piston upper and lower sides of force equilibrium, piston to stop up, regulating the mouth of the pneumatic valve opening remain the same. Output pressure and flow of compressed air outlet remain stable.
and when the output pressure is higher than the set pressure, piston force is greater than the upper side, pneumatic valve cover with the piston moves down, reduce pressure regulating pneumatic valve opening, the pressure regulating pneumatic valve mouth into the output cavity flow of gas is reduced, the output cavity gas pressure is reduced. If the pressure is still higher than the set value of the output cavity, the piston is still continue to move down, until the pressure regulating pneumatic valve fully closed. Cover the pneumatic valve spring force is no longer by pneumatic valve core effect on the piston, but to make the pneumatic valve cover bottom of the rubber gasket pressure on the pressure regulating pneumatic valve mouth tightly, pathways between the input cavity and output cavity is blocked. At this point, if the output pressure is equal to the set pressure value, the piston stop moving. At set pressure is the pressure regulating pneumatic valve pneumatic valve and the overflow mouth shut down at the same time, the pneumatic valve is in a state of static equilibrium of the outlet pressure.
, if the output pressure is higher than the set pressure value, continue to move down the piston, the overflow mouth pneumatic valve of pneumatic valve core on end face and the pneumatic valve cover bottom out, output cavity and the overflow cavity connected, the output cavity gas through the overflow pneumatic valve mouth through the EX port discharge. As the output cavity pressure drop, C cavity pressure also decreased, the pressure of the piston underside is higher than the upper, the piston with pneumatic valve core B along the axial moving up gradually down the overflow of the opening of the mouth of the pneumatic valve. When output pressure reached set value, the overflow mouth pneumatic valve and pneumatic valve cover bottom fully fit, between the output cavity and the overflow cavity path is blocked, the overflow to stop. At this point, the overflow mouth pneumatic valve and pressure regulating pneumatic valve mouth shut down at the same time, the pneumatic valve in the gas stops flowing state of static equilibrium. The pneumatic valve cover upper and lower side offset by air pressure in a state of balance, so, no matter the air intake ( IN how the pressure fluctuation, can affect the pneumatic valve inside the pressure balance, and thus can ensure outlet pressure steady needs is on the set value, the pressure characteristics of pneumatic valve has good.