Also 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. Effective 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.