Pneumatic actuators are actuators that use gas pressure to drive open and close and regulate valves. In general, pneumatic actuators are also equipped with auxiliary devices for use together. Commonly used are valve positioners and handwheel mechanisms. The role of the valve positioner is to use the feedback principle to improve the performance of the actuator so that the actuator can achieve accurate switching according to the controller’s control signal. The role of the handwheel mechanism is when the control system is due to power outages, gas outages, no controller output or actuator failure, the use of it can directly manipulate the control valve to maintain normal production and reduce the cost of downtime.

According to the stroke, the pneumatic actuator can be divided into quarter-turn type or linear operated type. In this article, we will have a brief introduction of components of COVNA pneumatic actuator. Hope it could help you know our quarter-turn actuator combined by what materials and if those are suitable for your project’s needs. Any demand for rack and pinion pneumatic actuators, feel free to consult us at

The COVNA rack & pinion pneumatic actuator consists of 27 components:

covna components of pneumatic actuator

No. Description Qty Standard Material Protection Optional Material
1 Indicator Screw 1 Plastic
2 Indicator 1 Plastic
3 Spring Clip 1 Stainless Steel
4 Thrust Washer 1 Stainless Steel
5 Outside Washer 1 Engineering Plastics
6 Body 1 Extruded Alluminum Alloy Hard Anodized etc
7 Inside Washer 1 Engineering Plastics
8 Cam 1 Alloy Steel
9 O-ring(Pinion Top) 1 NBR Viton/PTFE
10 Bearing(Pinion Top) 1 Engineering Plastics Stainless Steel
11 Pinion 1 Alloy Steel Nickel Plated
12 O-ring(Pinion Bottom) 1 Engineering Plastics
13 Bearing(Pinion Bottom) 1 NBR Viton/PTFE
14 Plug 2 NBR Viton/PTFE
15 O-ring(Adjust Screw) 2 NBR Viton/PTFE
16 Nut(Adjust Screw) 2 Stainless Steel
17 Adjust Screw 2 Stainless Steel
18 Piston 2 Cast Aluminum/Casting Anodized/Zinc Gaslvanized Stainless