Description

 

Application

Applied on small/middle rotary valves, such as ball valve, butterfly valve.
 

Technical Parameters

1. Work Medium

Dry or lubricated air or non-corrosive air. Dust below *0 micron.
 

2. Air Supply Pressure

Min. air pressure is 2.5bar, max. air pressure is 8bar.

 

3. Operating Temperature

Standard: **0℃~**0℃

Low: **5℃~**0℃

High: **5℃~***0℃
 

4. Stroke Adjustment

±5° Adjustment range at 0° and *0° point for rotation

 

Structure

 

1. Indicator

Multi-function position indicator with NAMUR is convenient for mounting accessories such as valve positioner, limit switch.
 

2. Pinion

The pinion is high-precision and integrative, made from nickel-plating steel, full conform to the standards of ISO****1, DIN***7, NAMUR. The size can be customized and stainless steel is available.
 

3. Actuator Body

According to the different requirements, the extruded aluminum alloy ASTM***5 body can be coated with hard anodized, polyester, PTFE or nickel. 
 

4. End cap

End caps are made of Aluminum die-casting, and can be coated with polyester, metal powder, PTFE and nickel.
 

5. Piston

The twin rack pistons are made of aluminum die-casting coated with hard anodized or steel coated with Zinc. Long lifespan, fast operation and reversed rotation by simple reversing. 
 

6. Stroke adjustment

The two independent external travel bolts can accurately adjust ±5°at both open and close position.
 

7. High performance spring

Preloaded springs are made from high quality material for resistant to corrosion and longer lifespan, which can be demounted safely and conveniently to satisfy different requirements of torque by changing quantity of springs.
 

8. Bearing & Guide

Made from low friction, long-life compound material, to avoid the direct contact between metals. The maintenance and replacement are easy and convenient.
 

9. O-rings

NBR O-rings provide trouble-free operation at standard temperature ranges. Viton or silicone for high and low temperature.
 

Operating Principle

Double Acting

1. Air from Port A forces the pistons outwards, causes the pinion to turn anticlockwise while the air exhausted through Port B.
 

2. Air from Port B forces the pistons inwards, causes the pinion to turn clockwise while the air exhausted through Port A.

Single Acting

1. Air from Port A forces the pistons outwards, causes the springs to compress, the pinion turns anticlockwise while the air exhausted through port B.

 

2. Loss of air force, compressed springs force the pistions inwards, causes the pinion turns clockwise while the air exhausted through Port A.

 

Non-standard rotation can be enforced by simple reversing the actuator. Air from Port A turn clockwise, from Port B turn anticlockwise.

 
 Fork type for large valve is optional.