Product description

These valves come in fully or semi-internal types to conform to different installation requirements. Unlike the standard full-range gradual relief, these internal pressure relief valves feature a 'pop-action' functionality that ensures a full discharge once pressure exceeds a predetermined limit.

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Body: Stainless steel, brass
Spring: Stainless steel, steel, coated steel
Stem: Stainless steel
Seat disc: Resilient rubber, resilient synthetic rubber or Viton
Stem bushing: 17 to 4PH stainless steel

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Gas types: LPG (Propane, Butane), NH3 (Ammonia, Anhydrous Ammonia)
Connections: Thread
Types: NPT
Pressure range: Max. 27 bar (391 psi)
Capacity: Max. 453 m3/h
Sizes and range: 3/4" to 3"
Standards: UL listed, ASME

*Materials and specifications are subject to generalisation. Our experienced people are ready to help you find the correct fit for your application. 

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  • Low profile design (no shearing or distortion)
  • Tamper-proof functioning parts
  • Longer spring size to minimise stress cracking in service
  • Easy installation and removal
  • High capacity - low turbulence
  • Dependable shut-off after opening
  • Built-in spring stop
  • 'Pop-action' minimising product loss
  • Automatic re-seating after pressure equalisation

Did you know?

Internal valves are suitable for many different applications

  • A blue external relief valve LPG NH3

    External relief valves

    In places where pressure can build to unsafe levels and cause dangerous situations, these relief valves provide added security for both people and equipment.

    See our External relief valves

Get in touch!

Whether you already know what you need, or you would like the opinion of an expert, we are always ready to help you out.