Description
Product Name: Pneumatic Diaphragm Actuator
Type: Spring return diaphragm
Action: Reverse acting or direct acting
Supply air pressure: 260 to 800 kPa
Air connection: 1/4 NPT or 3/8 NPT
Optional accessories: Positioner, Pressure regulator with filter, Limit switch, Solenoid valve, Handwheel, etc,
I. APPLICATION AREA
The multi-spring diaphragm pneumatic actuators are applied for the modulating operation of control valves in industrial automatic systems. There are three following design options for the actuator:
– direct action (air – advances the steam)
– reverse action (air – retracts the steam)
– direct action, handwheel
– reverse action, handwheel
II. FEATURES
· Completely reversible action, option to change spring range w/o extra parts.
· Rigid structure of cast yoke.
· Wide range of the available forces.
· Linear relationship between rod displacement and control pressure as a result of using membranes with constant active area.
· Various ranges of spring pressures due to the changeability of spring number and /or dislocation of distance fencers.
· Capability of the actuator to incorporate side-mounted handwheel, pneumatic or electro-pneumatic positioners, limit switches, air sets, three-way pneumatic solenoid valves, lockup valves, position transducers.
· High strength of diaphragms, springs, and packings.
· Small size and weight.
(a)Direct-acting Pneumatic Diaphragm Actuator(PZMA)
![direct acting diaphragm pneumatic actuator](https://cncontrolvalve.com/wp-content/uploads/2022/05/direct-acting-diaphragm-pneumatic-actuator-300x263.png)
1. Up diaphragm castings 2. Diaphragm
3. Diaphragm plate 4. Spring
5. Down diaphragm castings 6. Actuator stem
7. Yoke 8. Adjust nut
9. Travel indicator
(b)Reverse-acting Pneumatic Diaphragm Actuator(PZMB)
![reverse acting diaphragm pneumatic actuator](https://cncontrolvalve.com/wp-content/uploads/2022/05/reverse-acting-diaphragm-pneumatic-actuator-300x298.png)
1. Up diaphragm castings 2. Diaphragm
3. Diaphragm plate 4. Spring
5. Down diaphragm castings 6. Actuator stem
7. Yoke 8. Adjust nut
9.Travel indicator