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SIL 3 Linear Valve Actuators Now Available

Cowan Dynamics® announces the availability of linear hydraulic and pneumatic actuators with up to a SIL 3 safety rating. The SIL 3 capable rating is designed to provide our customers reliable actuation solutions in critical applications without compromising their Safety Instrumented Systems (SIS – compliant with IEC 61511/ISA 84).

The SIL 3 capable rating was achieved by certifying the products to IEC 61508 and was obtained from Exida Certification Services after passing rigorous Failure Mode Effects Diagnostic Analysis (FMEDA).

Cowan Dynamics’ SIL 3 capable products include:

Double-Acting Valve Actuator – A Series

  • PSI 150 psi
  • Bore Size 4″ to 42″ 
  • Low Temp. -54ºC to 90ºC
  • Standard Temp. -20ºC to 104ºC 
  • High Temp. -10ºC to 200ºC 
  • Thrust up to 425,000 lbs
  • Valve Mounting Kits Available
  • Optional Stainless Steel Construction

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Spring-Return Valve Actuator – AS Series

  • PSI 150 psi
  • Valve Size 2” to 10″
  • Low Temp. -54ºC to 90ºC
  • Standard Temp. -20ºC to 104ºC 
  • High Temp. -10ºC to 200ºC 
  • Fail-Close or Fail-Open
  • Thrust up to 72,000 lbs
  • Valve Mounting Kits Available

 AS Series Certificate

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Control Valve Actuator – AT Series

  • PSI 150 psi
  • Bore Size 4″ to 42″ 
  • Low Temp. -40ºC to 90ºC
  • Stand Temp. -20ºC to 90ºC 
  • Robust Position Feedback Ideal for Application Requiring Position Control
  • Thrust up to 425,000 lbs
  • Optional Stainless Steel Construction
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A²A Booster – Dual-Stage High-Output Pneumatic Booster

  • PSI 250 psi
  • Intensification Ratio 4 to 1 
  • Low Temp. -48ºC to 60ºC
  • Air Driven, Double-Acting Pressure Amplifiers
  • No Mechanical or Electrical Power Required
  • 4:1, 3:1, and 2:1 Intensification Ratios
Download Our A2A Brochure



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Double-Acting Hydraulic Valve Actuator – ML Series

  • PSI 3000 psi
  • Bore Size 1 1/2″ to 20″ 
  • Low Temp. -54ºC to 60ºC
  • Standard Temp. -40ºC to 105ºC 
  • High Temp. -29ºC to 205ºC 
  • Thrust up to 1,500,000 lbs
  • Valve Mounting Kits Available
  • Optional Stainless Steel Construction
Download Our ML Brochure



Complete the form to get a quote within 24hrs.



Hydraulic Spring-Return – MS Series

  • PSI 3000 psi
  • Bore Size 1 1/2″ to 14″ 
  • Low Temp. -54ºC to 60ºC
  • Standard Temp. -40ºC to 105ºC 
  • High Temp. -29ºC to 205ºC 
  • Fail-Close or Fail-Open
  • Thrust up to 72,000 lbs
  • Valve Mounting Kits Available
Download Our MS Brochure



Complete the form to get a quote within 24hrs.



Products certified to SIL 3 capability are, on request, supplied with copies of the Exida certification, which contains all the information that engineers and designers need to calculate the safety integrity level of their complete system, based on its component parts.

Safety Manuals: