Pneumatic Actuators

Asahi/America's Series 79 pneumatic actuators, for quarter turn ball and butterfly valves, provide accurate and dependable control, especially in corrosive applications.

The units are compact, yet extremely durable and available in output torques from 60 to 17,000 inch-pounds based on an 80-psi air supply. Three standard actuator materials are offered: glass reinforced polyamide, cataphoresis and rilsan coated cast aluminum alloy, and 316 stainless steel; all of which incorporate ISO and NAMUR mounting configurations for simple installation of accessories. These material choices provide excellent protection from adverse environments and corrosive process materials.

Two versions of this actuator are offered: single acting (air to spring or "failsafe") and double acting (air to air). Both versions utilize a double piston, double rack and pinion design.

There are definitive advantages for using the rack and pinion design; the accuracy of translating linear to rotary torque is one. This is especially important in a modulating application. Another advantage is the constant torque output throughout the travel, which simplifies actuator to valve sizing.