Rack and Pinion Pneumatic Actuator

Product: Rack and Pinion Pneumatic Actuator

Introduction

Rack and pinion pneumatic actuator is common actuation devices in industrial pipelines due to its compact configuration and convenient operation. Such pneumatic actuators are suitable for those rotary valves such as ball valves, butterfly valves, plug valves.

Working principle

Rack and pinion pneumatic actuator comes available in types of double acting and single acting.

(1) Double Acting Pneumatic Actuator

When the pressure of the air source enters the middle chamber between the two pistons of the cylinder from the air port “2”, the two pistons are separated and moved to the two ends of the cylinder, and the air in the air chambers at both ends is discharged through the air port’’4’’. Then the racks of the two pistons simultaneously drive the output shaft to rotate counterclockwise.

Conversely, when the pressure of the air source enters the air chambers at both ends of the cylinder from the air port ‘’4’’, the two pistons are moved toward the middle of the cylinder. The air in the intermediate air chamber is discharged through the air port ‘’2’’. Then the two piston racks simultaneously drive the output shaft to rotate clockwise.

If the piston is installed in the opposite direction, the output shaft becomes reverse rotation.

(2) Single acting Pneumatic Actuator

When the pressure of the air source enters the middle chamber between the two pistons of the cylinder from the air port ‘’2’’, the two pistons are separated and moved toward the ends of the cylinder, forcing the springs at both ends to compress. The air in the air chambers at both ends is discharged through the air port ‘’4’’. The two piston racks synchronously drive the output shaft to rotate counterclockwise.

After the air source pressure is reversed by the solenoid valve, the two pistons of the cylinder move in the middle direction under the elastic force of the spring. The air in the middle chamber is discharged from the air port ‘’2’’, and the two piston racks simultaneously drive the output shaft to rotate clockwise.

If the piston is installed in the opposite direction, the output shaft will turn in reverse when the spring returns.

Feature:

1.    Rack and pinion design allows the smooth action and easy maintenance;

2.    All internal parts are coated with lubricants to ensure prolonged longevity.

3.    Aluminum shell with anodizing surface provides corrosion proof performance;

4.    Spring acting and double acting can be exchangeable with the same body;

5.    Two internal bolts maintain the fully opening and closing at the position adjustment of ±5° .

6.    All pneumatic accessories conform to VDI/VDE 3845 and NAMUR standards and ISO mounting according to ISO5211 and DIN3337 (F03-F25)

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

Specification data:

Air supply range	2.5 bars -8 bars, Max 10 bars
Torque	Max 4700Nm
Stroke	90°, 135°，180 ° and customized angle
Working temperature	-40 ℃ to 150 ℃
Ambient temperature	-20°C to 90°C
Optional accessories	solenoid valve, positioners, limit switch, filter, regulator, lubricator, etc

FAQ:

1.    Q: Do you have any certification for actuators and valves?

A: Yes, it is certified by ISO 9001 and SIL Level 3.

2.    Q: Can I get one free sample to try in my market?

A: Yes, one set of free sample is dispatched by door-to-door courier.

3,  Q: Can you customize our design and logo for actuators and valves?

A: Yes, we can do ODM and OEM for all customers.

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