835 Industrial Hwy | Cinnaminson, NJ 08077

Series CAP

Pre-pinched Port
Mechanically Pinched
Single Pinch Mechanism
Simple Economical Design

  • Low pressure drop
  • No packing
  • Drop tight closure
  • On/Off or throttling service
  • Linear throttling characteristic
  • Fail Open or Fail Closed pneumatic actuators
  • Long lasting compression molded sleeve

Applications: Ideal for automatic control of abrasive, viscous, and corrosive fluids including wastewater, mine slurry, chemicals, cement, pulp , powder and pellets.

Operation: A pre-pinched pneumatically operated valve with the maintenance free Onyx Actuator. The actuator uses a spring for reliable fail-open (PFO) or fail-closed (PFC) operation in a range of sizes. It does not require lubricated air.


  • Flanges: ANSI STD. 125/150 lbs
  • Housing: Cast iron, ASTM A48, Class 35
  • Stem: 303 stainless steel
  • Yoke: Carbon steel
  • Actuator: Cast iron/PVC


  • Epoxy paint
  • Sleeve elastomer
  • 316 stainless steel stem
  • ANSI STD 300 lbs. Flange
  • Secondary containment package
  • Auxiliary hand wheel
  • Positioners
  • Solenoid valves
  • Limit switches

Valve Sizes:

Actuator Sizes:

Actuator Selection Information

Click to review options
Double Acting Cylinder PFO - Pneumatic Fall Open PFC - Pneumatic Fall Closed
All mechanically pinched pneumatic valves are available with 2 families of pneumatic actuator:
  1. A conventional air double acting cylinder. Air is applied alternating to the cylinder head and cylinder bottom to open and close the valve. This is inherently a Fail-in-last-position actuator.
  2. Onyx "Bomb Proof" zero maintenance actuator. This actuator is designed around a firestone airbag for the most robust construction and zero maintenance. It is available in two configurations:
A.PFO-Pneumatic Fail Open B.PFC-Pneumatic Fail Closed-Fails closed with a spring for the most dependable drop tight operation. All actuator sizing is performed by Onyx Engineers based on three factors:
  1. Valve Size
  2. Fail Mode
  3. Process Pressure
Consult the factory for assistance in specialty actuator size selection. Fill out the contact form at the bottom of this page with pertinent information and an Onyx Representative will be in contact with you shortly.

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