Spring Return Valve Rotary Pneumatic Air Actuator High Performance

^{Pneumatic Rotary Actuator Air Actuator Spring Return Valve Pneumatic Actuated Plastic Valve}

Principle of Single Acting Actuator (Spring Return)

CCW

Air to port A forces the pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from port B.

Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A.

CW

Air to port B forces the pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from port B.

Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A.

Principle of Double Acting Actuator

CCW

Air to Port A forces the pistons outwards, causing the pinion to turn counterclockwise while the air is being exhausted from Port B.

Air to Port B forces the pistons inwards, causing the pinion to turn clockwise while the air is being exhausted from Port A.

CW

Air to Port A forces the pistons outwards, causing the pinion to turn clockwise while the air is being exhausted from Port B.

Air to Port B forces the pistons inwards, causing the pinion to turn counterclockwise while the air is being exhausted from Port A.

^{► Construction}

<sup>1, Indicator

Position indicator with NAMUR is convenient for mounting accessories such as Limit Switch box, positioner and so on.

2, Pinion

Thepinion is high-precision and integrative, made form nickelled-alloy steel, full conform to the latest standards of ISO5211, DIN3337, NAMUR. The dimensions can be customized and the stainless steel is available.

3, Actuator Body

According to the different requirements, the extruded aluminum alloy ASTM6005
Body can be treated with hard anodized, powder polyester painted ( different
Colours is available such as blue, orange, yellow etc. ), PTFE or Nickel plated.

4, End caps
Die-casting aluminum powder polyester painted in differentcolours, PTFE or Nickel plated.

5, Pistons
The twin rack pistons are made form Die-casting aluminum treated with Hard anodized or madeform Cast steel with galvanization. Symmetric mounting position, long cycle life and fast operation, reversing rotation by simply inverting the pistons.

6, Travel adjustment
The tow independent external travelstop adjustment bolts can adjust± 5° At both open and close directions easily and precisely.

7, High performance</sup> springs
Preloaded coating springs are made form th High-performance<sup>terial for resistant to corrosion and longer service life, which can be denounced safelyand conveniently to satisfy different requirements of torque by changing quantity of springs.

8, Bearings & Guides
Madeform 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 rubber O-rings provide trouble-free operation at standard temperature ranges. For high andlow temperature applications Viton or Silicone.</sup>

^{► Pneumatic Valve Actuator}

^{Spring return actuators}

^{1. Pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from port B.}

^{2. Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A.}

^{3. Air to port B forces the pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from port B.}

^{4. Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A.}

^{pneumatic actuator}

^{H.S CODE: 8412390000
Model:}

^{Export area:North America Central-South America ASIA Europe Africa Oceania}

<sup>Introduction:
VS series pneumatic actuators (rack& pinion) have the following features.

> 15 actuator models, the output torque from 9NM to 4620Nm at 6 bar air supply.

> Bottom drilling complies with ISO5211/DIN3337 to match valve, interface for solenoid valve, shaft top end and top drilling for assembling accessories are in accordance with VDI/VDE3845 (Namur) standard and +/- 5 degree stroke adjustment.

> The actuator body & piston are over 20um hard anodized treatment and over 100um epoxy coated on end caps which meet ASTM B117 qualification, over 500 hours salt spread test, no corrosion onactuator.

> The end cap can be blue, black, grey, yellow etc. As your request.

> PTFE, Nickel, Epoxy, Polyester and Ceramic coated against corrosive & abrasive environment are available.</sup>