ML Series

Double-Acting Hydraulic Actuator

Compact. Simple. Versatile. Delivering thrust up to 1,500,000 lbs and SIL-3 Capable. Our double-acting hydraulic valve actuators are designed to suit a wide range of applications; from commodity to severe-service extremes.

hydraulic actuator double acting

Unleash your plant’s full potential. Upgrade to the ML Series.

Cowan ML Series Double-Acting Hydraulic Valve Actuators are designed to suit a wide range of applications; from commodity to severe-service extremes.


  • Thrust up to 1,500,000 lbs
  • SIL 3 Capable (IEC 61508)
  • GT3 Triple Seal Gland for Severe Service Applications


  • Bore Size: 1 1/2″ to 24″
  • Configuration: Single-Stage and Tandem
  • Stroke Range: Up to 144″
  • Pressure Rating: 3000 psi
  • Rod Size: 1″ – 10″
SIL3 Logo

Valve Compatibility

Our Series ML Double-Acting Hydraulic Actuator is compatible with any process valve that requires linear motion.

knife gate valve actuator

Knife Gate Valve

gate valve actuator

Gate Valve

Globe Valve

Pinch Valve

In Market Example

Canadian Oil Sands Tailings Application.
8″ Bore ML Series

In Market application for the Double-Acting Hydraulic Valve Actuator - ML Series

Control and Monitoring Solutions


Available in 316 Stainless Construction

316 Stainless Steel construction
For corrosive applications. Includes attachments such as Rod Clevis and Eye Brackets.

HPU & Gas/Oil Systems

HPU & Gas/Oil Systems
HPU and Gas/Oil Systems available. Standard and custom units engineered to customer specifications and applications.

Manual Hand Pump

Manual Hand Pump for the Double-Acting Hydraulic Valve Actuator

Hydraulic manual override with indicator.

Mounting Kits: ISO, MSS & Customized Patterns Available

Mounting Kits
Cowan valve mounting kits can be designed for any linear hydraulic actuator for valve control. Mounting kits available in steel and stainless steel construction.

Anti-Rotation Torque Arm:

Maintains constant alignment between valve stem and cylinder piston-rod. Compatible with rotary type switch boxes and beacons.

Field-Adjustable Travel Stops:
To limit stroke for position-seated or limited-travel applications. Ensures valve reaches positive sealing every time without damage to valve internals.

GT3 Gland for Harsh Environments

GT3 Gland
Triple-seal gland with dual wipers. Rugged metallic scrapper and urethane double-acting wiper deflect contamination away from the rod seal for long service life for your hydraulic actuator.


Low Temp

Cast Iron construction for applications where yellow metals are not allowed

Limit Switches

Limit Switches

Mechanical Limit Switch SPDT, for Open & Close Indication. Inductive switches also available. Solid State, Reed and inductive type also available. Specify brand and part number for your hydraulic actuator.

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