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Scotch-yoke valve actuators


PN and HY-Series pneumatic and hydraulic scotch-yoke valve actuators have been designed specifically to guarantee long cycle life in the most demanding applications and environmental conditions. A fabricated steel frame, coupled with an all-steel construction, results in lighter and more corrosion resistant scotch-yoke valve actuators than traditional designs employing castings. A light design, superior corrosion resistance and an Ingress Protection rating of IP66 as standard make PN & HY-Series scotch-yoke valve actuators an ideal choice for offshore applications, or any other in which weight and corrosion resistance are critical design considerations.


Automation of any quarter-turn mechanism; including ball, butterfly & plug valves and louvers & dampers.

Operating Ranges

Supply Pressures

  • PN-Series: 2.7 to 12 Barg (40 to 174 psig)
  • HY-Series: 13 to 250 Barg (189 to 3,625 psig)

Torque Outputs

  • 200 to 680,000 Nm (1,770 to 6,018,000 lb in)


  • Ultra-low: -65 to +80°C (-85 to +176°F) (HY-Series only)
  • Low: -45 to +60°C (-49 to +140°F)
  • Standard: -20 to +80°C (-4 to 176°F)
  • High: -20 to +140°C  (-4 to +284°F)

Key Features & Benefits

  • Third party approved for use in SIL 3 certified systems

  • Electroless nickel plated cylinder as standard with hard chromium plating, Xylan® or Electro-film available

  • Springs contained within a fully welded canister (which is post weld heat treated) to guarantee simple and safe removal

  • Springs are scragged (set removal) in order to warrant optimum and stable output torque characteristics

  • Easy and economical maintenance due to simplified design, no special tools required

  • Compliant to PED 97/23/EC

  • Modular construction means greater flexibility when selecting cylinder/spring combinations, and reduces production downtime during field servicing

  • Various scotch-yoke configurations (symmetrical, demi-canted and canted) allows for optimum and cost effective valve actuator sizing

  • Suitable for high frequency and high speed operation

  • Guide bar frame design used to eliminate side forces and low friction seals ensure high efficiency, even at low supply pressures

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