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Valves & Actuation
Series 79 AtoA on Type 57 Fast Pack

Actuated Plastic Butterfly Valves

Series 79 on Type-57P Butterfly Valve (1-1/2" – 24")

The Type-57P butterfly valve from Asahi/America has the ability to mount a series 79 pneumatic actuator to allow for the valve to be controlled via an air supply. Actuators are sized to operate on 80psi of air pressure, and can be sized to operate on different air pressures upon request. Actuators are available as either air-to-air (double acting) or air-to-spring (single acting), with air to spring units having the option to fail either open or closed. The actuators are mounted on the valve through a coupling and bracket set up with an ISO bolt pattern. Units have a visual position indicator and operate as quarter turn actuators. Automation can be performed through optional equipment such as solenoids, positioners or BUS systems.


Data Sheet

O&M Manual

Ideal Applications Include:

Chemical Processing, Bleach Plants, Aquariums, Mining, Water Treatment, Landfills, Swimming Pools, Power Plants



1 ½” – 24” Type-57P/56/75 butterfly valve


Air-to-spring (fail open)
Air-to-spring (fail closed)

Air Supply:

80psi (standard)
60 – 120psi (optional)


Double piston, double rack and pinion


Glass filled polyamide, cataphoresis coated aluminum, stainless steel

Air Connections:

1/4" NPT

Mounting Dimensions:

ISO and Namur


  • Actuator body and end caps constructed of glass-filled polyamide or cataphoresis coated aluminum (depending on valve size)
  • Double piston double rack and pinion
  • ISO valve mounting pattern
  • ISO female star drive output
  • NAMUR accessory mounting pattern
  • Operates on 80psi (recommended) to 120psi (maximum) filtered air supply
  • Spring return models have cataphoresis coating or chromium passivation for spring protection
  • Available in air-to-air or air-to-spring models
  • Position indication through visible indicator knob and flats on actuator shaft
  • Actuator shaft constructed of cataphoresis coated steel or stainless steel with double o-ring seals top and bottom
  • End position adjustable travel stops
  • Polyacetal or PTFE/bronze piston guides
  • Self-lubricating BUNA-N o-ring seals
  • -25°F – 125°F temperature range
  • ¼" NPT air connections