the SPS-K & SPD-K series

ProControl Valve Actuation & Control - specialized in Scotch Yoke Actuators - canted and symmetric scotch yoke mechanism


ProControl has created the SPS-K & SPD-K series actuators based on the markets requirements for a new compact heavy duty high performance design actuator.
For single acting models the cylinder assembly also contains the spring, thus the advantage of a compact design


  • Fabricated entirely from low temperature carbon steel according to ASTM A352 gr. LCB and ASTM A350 LF2.
  • Totally enclosed weatherproof housing.
  • Scotch yoke mechanism to suit valve torque requirements.
  • Relief vent to expel undesired overpressure.
  • Low pressure pneumatic cylinder for supply pressures up to 12 bar design suitable for instrument air or sweet / inert gas applications or special application with material according to NACE requirements for sour gas supply medium.
  • Carbon steel piston with dynamic floating O-ring seals coupled with lubricating piston guide rings.
  • Alloy steel spring (only for single acting).
  • 17.4 PH shaft and mechanical position indicator (fully sealed IP68 to avoid ingress into the scotch yoke area) and square male output shaft complete with VDI/VDE 3845 NAMUR drive slot for monitoring devices.
  • Bronze sliding blocks which ensure minimum friction, allowing for a long service life and reducing maintenance costs.
  • Bronze thrust bearings which guides the actuators shaft & yoke throughout its stroke and supports all transverse loads generated.
  • ASTM A 320 L7 alloy steel tie rods, with standard electrolytic zinc coating according to ASTM B633 FeZn 12 (thickness 12 μm).
  • AISI 316 stainless steel end travel stops allow for accurate angular stroke adjustment.
  • Integral manual override facilities.
  • Design allows 4 x 90° actuator rotation.
  • AISI 316 stainless steel external bolting.


  • Supply pressure up to 12 bar design.
  • Actuator torque output up to 1.000 Nm.
  • Standard operating temperature range -30°C / +100°C.
  • Special low temperature application up to -60°C.
  • Special high temperature application up to +200°C.
  • All ProControl pressure containing parts are designed according to ASME VIII div.1 and EN 13445.
  • All ProControl actuators are designed for 30 years’ service life.
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