Rotary pneumatic actuator for shut-off valves SC-RAT/RST140-DA

Pneumatic rotary actuator for shut-off valves SC-RAT/RST140-DA with a piston diameter of 140 mm features a rotation 90 or 180° and a torque up to 701.92 Nm (at pressure 8 bar). This is a reliable pneumatic actuator designed for installation on large ball valves and butterfly valves DN 125~250, featuring a standard mounting base for the actuator F10/F12 according to standard ISO 5211/DIN3337. When ordering, you should consider the required Nm and choose the mode of action:

• SC-RAT140-DA — double-acting pneumatic actuator. Must be equipped with a Namur standard distributor 5/2 with a thread size of 1/4″ at the output of the pneumatic distributor;
• SC-RST140-DA — single-acting pneumatic actuator with forced spring return to the closed/open position in case of air pressure drop. The rotation force depends on the number of springs (from 5 to 12). Both 3/2 and 5/2 distributors can be used for control. We recommend supplying air to both outputs using the 5/2 configuration.

Horizontal Pneumatic Actuator 140 SC-RAT/RST140-DA

The air drive housings from Specialist are made of extruded aluminium with deep anodizing of the internal and external surfaces.

Structurally, it is a quarter-turn rack pneumatic cylinder 90±4° for ball valves or 180±4°. It can be equipped with pneumatic distributors of NAMUR standard, positioners, and limit switch blocks.