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Oliver Valvetek Product Range

Subsea Relief Valves

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The Oliver Valvetek Subsea Relief Valves have a cracking pressure of 10 psi to 20 psi and a reverse sealing pressure of up to 5,000psi. Our relief valves are widely regarded as an industry standard when it comes to preventing leakage from hydraulically actuated gate valves.


Oliver Valvetek's Subsea Relief Valves are widely used on hydraulically actuated gate valves to prevent leakage from gland seals entering actuators.

The fail close sprung poppet arrangements have been design and flow tested to prevent pressure build ups by relieving to the sea, and closing to stop the seawater from entering.

The small bore subsea relief valves can be supplied with a range of opening pressures and are suitable for water depths to 3050m (10,000ft). We are also able to work with customers to extend the standard 20 PSI cracking pressure where necessary.

Subsea Relief Valve Specifications:
Body ConstructionBS 970 316S11 stainless steel
Inlet ConnectionTo customers specific requirement.
Water Depths3050m (10,000ft).
Reverse Sealing Pressure5,000 PSI
Cracking Pressure10 PSI to 20 PSI

Key Features

  • Pressure relief valve, typical material of body construction being BS 970 316S11 stainless steel spindle material of 316 stainless steel. Other material options are available on request.
  • A range of inlet connections based on the customers specific requirements.
  • Certification for materials of wetted pressure retaining parts (i.e. body and spindle) are traceable to original material certification to BS EN 10204 3.1. (3.2. certification also available upon request).

Technical Specifications

  • The valve has been designed and tested to have a cracking pressure of 10psi to 20psi and a reverse sealing pressure of 5,000psi.
  • The operating temperature range is - 40 C to 121 C.