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Double-piston rack, using cast aluminum hard oxidation or cast steel galvanized treatment, symmetrical installation position, fast operation, long service life, simple inversion of the piston can change the direction of rotation.

Two independent stroke adjustment screws can easily and accurately adjust the opening and closing positions of ±5°.

High-performance spring, using high-quality materials, coating treatment, pre-compression assembly. With strong corrosion resistance and service life, it can safely and simply disassemble single-acting actuators, and meet different torque output ranges by changing the number of springs.



Product Introduction


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


The pinion is high-precision and integrative, made from nickelled-alloy steel, full conform to the lastest standards of NAMUR, ISO5211, DN3337. The dimensions can be customized and the stainless steel pinion is available.

Actuator Body

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

End caps

With die-casting aluminum alloy surface, coated with various metal powder, PTFE or Nickel plated.


The twin rack pistons are with die-cast aluminum hard oxidation or cast steel galvanized treatment, symmetric mounted, quick operation, long service life and fast operation, change the rotation direction by simply reversing the pistons.

Travel adjustment

Two independent external travel adjustment bolts can adjust the position at both on and off directions easily and precisely, the adjustment range is ±5°.

High performance springs

The spring adopts high quality material, coating treatment, and preload assembly. It has strong corrosion resistance and longer service life. It can disassembly single action actuators safely and simply, to meet different requirements of torque by changing the number of springs.


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


NBR rubber O-rings provide trouble-free operation at standard temperature ranges. For high and low temperature applications Viton or Silicone rubber O-rings are the best choice.

Sizing:Double Acting Actuator

The suggested safety factor for double acting actuators under normal working conditions is 120%-130%


●The torque needed by valve=100Nm

●The torque considered safety factor 130%=130N.m

●Air Supply=5Bar

According to the above table, we can choose the minimum model is HPR160DA.

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