Hydraulic Valve Actuation


Stream-Flo’s Crown hydraulic actuated valves are used for the automatic closing of gate valves on wellheads and flow lines under emergency conditions. The system consists of a hydraulic actuator and a reverse-acting gate valve.

Proven in extreme conditions around the world, Crown hydraulic actuated valves are API 6A certified and SIL 3 capable to provide reliable protection of personnel, facilities, resources, and the environment.


Crown hydraulic actuated valves can be applied as:

  • Emergency Shutdown Valves (ESDVs)
  • High Integrity Protection Systems (HIPSs)
  • High Integrity Pressure Protection Systems (HIPPSs)
  • Shutdown Valves (SDVs)
  • Surface Safety Valves (SSVs)

In the following applications:

  • Wells – Conventional
  • Wells – Gas Storage
  • Wells – High Pressure
  • Wells – High Temperature
  • Wells – Water Disposal
  • Flowlines
  • Manifolds
  • Skids


Hydraulic Design Features: Actuator

The actuator hydraulically opens and closes upon release of hydraulic pressure. Modular design allows the actuator to be changed independent of the gate valve and bonnet assembly, thus providing ease of service or replacement.

Hydraulic Design Features: Assembly

Built-in gate stops, both upper and lower, are incorporated in the bonnet assembly. This enables the valve and bonnet to be completely assembled and stroke set independent of the actuator. A metal-to-metal stem back seat provides a means of sealing to isolate the stem-packing cavity from the flow medium in the event of a stem packing failure in addition to providing an upper travel stop for the gate.



API 6A Sizes: 1-13/16” to 11”

API 6A Pressure Ratings to 20,000 psi

API 6A Temperature Classifications K to Y (-75°F/-60°C to +650°F/+345°C)

API 6A Material Classes AA to HH

API 6A Performance Requirements 1 & 2

API 6A Product Specification Levels 1, 2, 3, 3G & 4

SIL 3 Capable

Fire-Safe Capable


Standard Maximum Cylinder Working Pressure – 3500 psi (optional maximum cylinder working pressures available upon request)


  • Custom Packaged Actuation Systems
  • Indicator Rod Protectors
  • Limit Switches
  • Lock Open Devices
  • Theft Proof Enclosures
  • Other application requirements



Crown Actuated Valves & Controls Brochure

Technical Bulletins

Available upon request. Email us at info@streamflo.com


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