the SPS & SPD series

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


The SPS & SPD series, heavy duty high performance design actuators, are for ProControl the long-standing products of the range.
The reliability and firmness that distinguish them arise from a constant innovation research combined with the experience gained over the years.


  • Fabricated entirely from carbon steel.
  • 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.
  • Carbon steel spring cartridge (only for single acting) with safety facility which allows safe installation and removal of the whole cartridge assembly.
  • AISI 316SS mechanical position indicator (fully sealed IP68 to avoid ingress into the scotch yoke area) 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 and high strength alloy steel chromium plated thrust reaction bar which guides the scotch 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 12μm).
  • Alloy steel end travel stops allow for accurate angular stroke adjustment.
  • Integral manual override facilities.
  • Design allows 4 x 90° actuator rotation.


  • Supply pressure up to 12 bar design.
  • Actuator torque output up to 1.000.000 Nm for single acting and up to 2.000.000 Nm for double acting.
  • Spring starting torque up to 400.000 Nm.
  • Spring ending torque up to 250.000 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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