The Swagelok MS-131-SR is a 131 Series pneumatic spring-return actuator that delivers 90° valve rotation for Swagelok ball valves. It uses a rack-and-pinion drive, is ISO 5211-compliant, and provides an actuator air displacement of 1.5 in³ (24.6 cm³) with a spring-return operation. The MS-131-SR weighs about 1.5 lb (0.7 kg) and is designed to pair with Swagelok ball valves and related actuation kits for reliable field installation.
