Series PP
Actuators Spring Opposed Piston & Double Acting Piston

  • The vsL range of pneumatic piston actuators has been designed to provide powerful high performance for automatic control valves.
  • Corrosion resistance to aggressive environments has led to careful consideration of component selection, whilst keeping in mind the need for weight reduction.
  • Safety is an important consideration and spring containment has been carefully addressed so that inadvertent energy release has been eliminated.
  • The foregoing conditions have led to unit being designed to accept air pressure up to 10 Bar, to provide thrust and stiffness.
  • The end caps, piston, stems and tie bars are all either carbon or stainless steel, with the cylinder being a strong light composite material called Black Amalgon.
  • This careful material selection makes the actuator inherently strong, durable and corrosion resistant.
  • The spring is contained in a cage and the spring cap is secured with HT steel tie rods and the nuts welded in place.
  • This cage cartridge design prevents accidental unbolting of a pre-compressed spring and possibility of a catastrophic energy release.
  • A further feature is the spring being contained inside the cylinder in a protected clean environment inhibiting atmospheric degradation.
  • The actuator is also available as a spring-less double acting unit for even greater bidirectional thrust.
  • The following sizes are available as spring opposed pistons, double acting pistons or springless double acting pistons.


Actuator Type Spring Opposed Piston, Double Acting Piston
Actuator Action Direct / Reverse Acting
Materials Wide range of materials available to suit application
Spring Range See Table 1
Air Supply 20 - 150 PsIG (1.4 - 10.0 Bar)
Air Connection 1/4” or 1/2” NPT
Accessories valve Positioners - Pneumatic, Electro-Pneumatic, smart Instruments - Airset, solenoid valve, volume Booster, Airlock, Limit switches
Features Top or side Mounted handwheel, Limit stops


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+44 (0) 1274 531992

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Valve Solutions Ltd, Unit 10,
Acorn Business Park, Baildon
Shipley BD17 7SW