OpTK™ Linear Piston-Cylinder Actuator

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The Optimux OpTK Linear Piston-Cylinder actuator is a powerful, high-performance pneumatic actuator that provides positive throttling or on-off operation for automatic control valves. The cylinders are double acting and designed for instrument air supply pressures of up to 150 psi – allowing the OpTK to generate a lot of thrust from a compact footprint.

This actuator is fully field reversible for air-to-open or air-to-close action without additional parts; a spring provides fail-safe operation. The positioner supplies air to both sides of the piston, providing exceptionally stiff, precise movement together with very high frequency response.

  • High thrust – 150 psi (10.3 Bar) operating pressure allows substantially higher thrust than comparable diaphragm actuators, which provides tighter valve shutoff.
  • High frequency – double-acting configuration responds quickly to signal changes response
  • Compact substantially lighter and more compact than comparable linear diaphragm actuators, for a smaller overall valve footprint and easier installation and maintenance.
  • Versatile – standard actuator sizes 25, 50 and 100 will handle thrust requirements for over 95% of process applications. Larger sizes are available for special applications.
  • Fewer parts – 1/3 fewer parts than diaphragm linear actuators. Wear parts cost 1/10 of those for diaphragms, and less inventory is required to maintain actuators.
  • Dynamic positioning – supply pressure is sent to both sides of the piston for stiff, precise operation. Air volume between the piston and the bottom of the cylinder provides powerful pneumatic stiffness, allowing a high pressure drop – without plug slamming.
  • Field reversible failure mode is easily reversed without additional parts.
  • Fail-safe spring – internal spring provides fail-safe operation in the event of air system failure. Universal spring bench set is not required.
  • Stiff operation – supply pressure is sent to both sides of piston for stiff and precise actuator operation without hunting hysteresis.
  • Durable components – high quality materials require very little maintenance, no diaphragm to rupture.
  • Simple maintenance – periodic maintenance is easy to perform, since the spring cylinder actuator only requires the removal of two parts to access all internal parts.
  • Low air consumption – cylinder design uses less supply air than comparable diaphragm actuators.
  • Longer strokes – Size 25 spring cylinder linear actuator has a 1 1/2 -inch (38 mm) stroke, in contrast to a 3/4 -inch (19 mm) stroke on a comparable linear diaphragm actuator. Larger actuators have similar comparisons. Stroke lengths are available up to 24-inches.
Actuator Type


Base Valve Type

Globe, Angle, 3-Way, Custom-Engineered/Specialty

Air Supply (PSI)

30 to 150

Piston Size (inch squared)

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Actuator Materials


Failure Position

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Actuator Options

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