Full Round Port
Mechanically Pinched
Dual Pinch Mechanism
Most Economical Mechanical Design
Open Frame Design
Low to Moderate Pressures
- Available in Full Round or Pre-Pinched construction.
- Light weight
- Low pressure drop
- Drop tight closure
- On/Off or throttling service
- Fail Open or Fail Closed pneumatic actuators
Warnings: Warning ! Open frame valves have no provision for containing process fluid during a sleeve failure. Fluid may erupt unexpectedly from the valve. Do not use an open frame valve for fluids that are hot, acidic, flammable or toxic. Otherwise, serious injury may result.
![DAO_photo_1](https://onyxvalve.com/wp-content/uploads/2020/09/DAO_photo_1.jpg)
![DAO_photo_2](https://onyxvalve.com/wp-content/uploads/2020/09/DAO_photo_2.jpg)
Specifications:
- Flanges: ANSI STD 125/150 lbs
- Stem & Guide rods: 303 stainless steel
Options:
- Epoxy paint
- Sleeve elastomer
- Valve length
- 316 stainless steel stem
- Positioners
- Solenoid valves
- Limit switches
Technical Rescource:
![](https://onyxvalve.com/wp-content/uploads/2020/09/DAO_drawing_1.jpg)
Valve Sizes:
![](https://onyxvalve.com/wp-content/uploads/2020/09/DAO_table_1.jpg)
Actuator Sizes:
Actuator Selection Information
Click to review options
Double Acting Cylinder
PFO - Pneumatic Fall Open
PFC - Pneumatic Fall Closed
![](https://onyxvalve.com/wp-content/uploads/2020/09/ADA-Actuator.png)
![](https://onyxvalve.com/wp-content/uploads/2020/09/PFO-Actuator.png)
![](https://onyxvalve.com/wp-content/uploads/2020/09/PFC-Actuator.png)
All mechanically pinched pneumatic valves are available with 2 families of pneumatic actuator:
- 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.
- 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:
- Valve Size
- Fail Mode
- Process Pressure
![](https://onyxvalve.com/wp-content/uploads/2020/09/DAC_table_2.jpg)