H664H pneumatic extraction check valves for thermal power plants or exhaust system or other systems , and water and other non -corrosive media pipeline to prevent pressure turbine stage within the turbine load is suddenly reduced , and each extraction tube heater back into the steam turbine to the turbine causing pieces to break and destroy a vicious accident turbine generator and prevents the water heater system pipeline leak tight shut from extraction , to ensure that the water level in the feedwater heater ultra appears when pneumatic after receiving the liquid countercurrent signal device components , quickly separated the turbine , steam turbine or exhaust system to give maximum protection.
Gas from the compressed air source ( air pressure 0.4 ~ 0.6Mpa), through ball into the two -way solenoid valves, quick exhaust valve after the last intake port into the cylinder , check valve opens. Manual valve is used to run the test check valve flexibility .
When the check valve is closed, the solenoid valve is closed off , cut off the gas supply , quick exhaust valve actuation , the lower chamber of the cylinder exhaust air , quick closing check valve .
Solenoid valve, air treatment components, such as control components , steam turbine plant according to the requirements by the United States ASCO imported products, according to user requirements with other domestic and foreign manufacturers of quality products to ensure excellent performance and high reliability.
Features:
1, the sealing surface Cr13 stainless steel or cobalt-based alloy , has good wear resistance, stable and reliable sealing performance.
2 , when the medium forward flow , the lower chamber of the cylinder intake , and weight together, co- balanced valve is located in the fully open position. When the medium reverse flow , the lower chamber of the cylinder piston rapid relief , quick closing valve in 0.5 seconds .
3 , through extensions and fork weight acting on the pin, to balance and re- torque the rocker to prevent water hammer phenomenon. When the medium flows forward , helping to open the valve and keep the valve smooth and reduce vibration during operation.

Performance Specifications:

Main parts and materials: