BLEEDER TRIP VALVE (NON RETURN STOP CHECK VALVE)

Bleeder Trip Valves always have operated same as general swing check valves. 
But it makes to high seating thrust with the assistance of the pneumatic cylinder actuator when it is needed
more tightly seating. Also, Bleeder Trip Valves are straightthrough valves usually operated automatically. 
These valves are equipped with a safety pneumatic actuator that provides assistance to the valve at the beginning of closing operation. But it has high height because it must have high lift length and the stop
lift check valve has disadvantages for horizontal pipelines.

The type of Bleeder Trip Valve\'s actuator is single acting. When the solenoid was only energized, the air pressure of the actuator\'s cylinder is emission, and then pre-loaded spring of the actuator is extended, that is, seating mode. This type is simple and free from air fail and electrical fail. When electrical fail occur, although the
seating mode is unable remotely, it is more important to be continued in operation mode than the seating mode.

The solenoid valve of Bleeder Trip Valve\'s actuator is the normal open type and so when you directly supply air, the actuator\' stem is up and the crank arm rotate in counterclockwise. This state is on operating mode and Bleeder Trip Valve operate same as general swing check valves. If the fail occur in air line, because Bleeder
Trip Valve\'s actuator has connected the air check valve in air inlet pipe the actuator is on lock state.