Type 94605/946H5/95605/956H5

> Stainless Steel Safety Valves
> High Pressure Applications

Product Description

Type 94605/946H5/95605/956H5

4.6mm Nominal Bore Enclosed Discharge Safety Relief Valve for Compressed Air & Gases – Including Hydrogen


Example Applications:
  • Air/Gas Compression
  • Air/Gas Boosters
  • Natural Gas
  • Pressure Vessels
  • Hydrogen Production
  • Hydrogen Storage


Key Features:
  • Compact and space-saving design
  • Designed and built for repeatable operation
  • Advanced sealing technology with super-lapped hard-faced seat and disc, designed to offer robust high-performance sealing
  • Orientable gas-tight packed lever option (9*6H5 only)
  • Simple and robust design with three moving parts
  • Maintenance-friendly design
  • All wrought construction with no castings
  • Designed with Hydrogen embrittlement resistant materials (H2 option)**For Hydrogen applications above 515 bar, a ceramic disc is required, use type 956H5**



View or Download Datasheet


Technical Information

Technical Information for Type 94605 / 946H5 / 95605 / 956H5

  • Min. Pressure
    35.00 bar (507.50 psi)
  • Max. Pressure
    1100.00 bar (15950.00 psi)
  • Temperature Range
    -196°C to 300°C (subject to seal material)
  • Flow Area
    16.61 mm² (4.6 mm inlet bore diameter)
  • Inlet Connection(s)
    BSPP, BSPT, NPT or Cone & Thread
  • Outlet Connection(s)
    BSPP or NPT
  • Flow Rate
    Refer to Flow Tables on the datasheet
  • Materials
    St. Steel
  • Seal Materials
    Metal or ceramic disc seal
  • Test Certification
    Included - supplied Free of charge
Flow Rates:
  • See Datasheet


  • Stainless Steel construction with metal or ceramic disc seal


  • The maximum permissible built-up back pressure is 10% of the set pressure
  • Relieving pressure is set pressure +10%
  • For Hydrogen applications above 515 bar, a ceramic disc is required, use type 956H5**


Inlet connection options:
  • BSP (male) max 515 bar
  • BSPT (male) max 515 bar
  • NPT (male) max 1034 bar
  • Cone & Thread (female) max 1100 bar


  • BS EN ISO 4126-1
  • PED 2014/68/EU
    • Module B – TÜV Rheinland
    • Module D – LRQA Deutschland
  • PE(S)R 2016 (UKCA)
    • Module B – TÜV UK
    • Module D – LRQA UK
  • Seat tightness better than API 527

(EAC marking available upon request)


Pressure Guardians

Pressure relief valves stand sentinel in diverse systems, automatically releasing excess pressure and preventing equipment damage. Essential safety measures for various industries and applications.

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Solutions for the Hydrogen Industry

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Seetru offers a range of safety relief valves and change-over valves for hydrogen applications.  Seetru safety relief valves are efficient and incorporate the exclusive Tutchtite– seal technology for repeatable bubble-tight sealing performance: designed for applications including air/gas compressors, specialist gas plants, chemical equipment and piping, pressure vessels, thermal relief and medical gases, etc.

Find Seetru Products for Hydrogen View the Type 94605 / 946h5 /95605 / 956h5 Datasheet