known as Auto diaphragm valves - Pneumatically operated
diaphragm actuators can be direct, reverse or double
acting in operation with spring or can be springless.
Springless actuator can be supplied with the air
reservoir for fail safe position.
area 9 sq. in. to 300 sq. in. and in case of double
diaphragm actuators. it can go up to 600 sq.in.to
match any thrust requirements
Valve Closing time:
Valve Opening time:
Air Pressure: Upto 50
psig for diaphragm
psig for Cyclinder
type actuator can be supplied with 3
psig constant loading
Line pressure: 150
psig for valve size up to 100mm
for valve size upto 150mm
150 mm size, line pressure will be lower.
acting actuated diaphragm valve (Air to close, spring
to open, DOPC):
actuator is designed to operate from a normally open position.
Air pressure on
the top side of the actuator diaphragm
closes the valve, and the spring opens the
valve, when the air is released from the actuator.
(Air failure valve opens)