Asahi America E79M2PFSNST Pneumatic Actuator Spring Return

Asahi/America E79M2PFSNST is a 6-inch butterfly valve package that pairs a Series 79 pneumatic actuator with a spring-return, delivering reliable, fail-safe control for quarter-turn butterfly valves. The actuator operates as an air-to-spring (single-acting) device, delivering a spring-driven position when air pressure is removed to ensure a defined shut or open state. This package is designed for Asahi/America Type-57P butterfly valves and features ISO 5211 mounting pads and NAMUR-compatible interfaces for straightforward mounting and optional accessories. Series 79 actuators are offered in air-to-spring configurations for butterfly valves up to 6 inches in size, with a drive shaft constructed from 303 stainless steel or cataphoresis-coated for corrosion resistance. The valve/actuator combination can be sourced as a Fast Pack, a factory-mounted solution that includes the 6-inch butterfly valve and spring-return actuator (with 8-inch Fast Pack offerings also available), simplifying installation in space-constrained or demanding environments. In practice, these assemblies are used in process and water-treatment applications where compact, dependable actuation is required and a defined fail-safe position is critical when the air supply is interrupted.