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Home / Products / Valves / Hydrogen / Enclosed Valves for Hydrogen

Enclosed Discharge Safety Relief Valves for Hydrogen


The Seetru range of safety valves for compressed air and gas are compact, highly 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 medical gases and Hydrogen.

These valves are manufactured in bronze, brass or stainless steel and offer a wide range of connections, for applications up to 300°C. Manufactured in accordance with a wide range of international standards and approvals such as TÜV (Germany) to AD Merkblatt A2, National Board UV Stamp to ASME Section VIII Division 1, EAC customs union (Russia, Belarus and Kazakhstan) and compliant with the requirements of the Pressure Equipment Directive, PED (CE marked).

Seetru safety relief valves are now supplied UKCA marked and approved

Type 636 & 656
Type 636 & 656
Enclosed Discharge Safety Relief Valves Bronze body with either a Brass or Stainless Steel Inlet with Elastomer Rubber SealingInlet Connections from 3/8" to 2" BSP, BSPT or NPT (depending on bore size)Set Pressures from 0.32 to 55.2 barg (depending on bore size)
Type 646
Type 646
Enclosed Discharge Safety Relief ValvesStainless Steel Construction with Elastomer Rubber SealingInlet Connections from 3/8" to 2" BSP, BSPT or NPT (depending on bore size)Set Pressures from 0.32 to 55.2 barg (depending on bore size)
Type 936
Type 936 Air & Gas
Enclosed Discharge Safety Relief ValvesBrass inlet with either Bronze or Stainless Steel body with Metal to Metal sealingInlet Connections from 1/2" to 2" BSP, BSPT or NPT (depending on valve bore size)Set Pressures from 0.3 to 28.0 bar (depending on valve bore size)
Type 946
Type 946 Air & Gas
Enclosed Discharge Safety Relief ValvesStainless Steel construction with Metal to Metal sealingInlet Connections from 1/2" to 2" BSP, BSPT or NPT (depending on valve bore size)Set Pressures from 0.3 to 28.0 bar (depending on valve bore size)
33020, 34020 & 34320 6.4mm Bore Safety Relief Valve
33020, 34020 & 34320
Enclosed Discharge Safety Relief ValvesBrass or Stainless Steel body with Stainless Steel inlet and Elastomer Rubber sealingInlet Connections from 3/8" to 1/2" BSP, BSPT or NPTSet Pressures from 55.0 to 103.4 bar
33110, 34110 & 34410
33110, 34110 & 34410
Enclosed Discharge Safety Relief ValvesEither Brass or Stainless Steel body with Stainless Steel inlet and Elastomer Rubber sealingInlet Connections from 3/8" to 1/2" BSP, BSPT or NPTSet Pressures from 27 to 36 & 48.3 to 241.3 Bar
Type 329
Type 329
Enclosed Discharge Safety Relief ValvesBronze or Stainless Steel body with Stainless Steel inlet with P.T.F.E. sealingInlet Connections from 3/8" to 3/4" BSP, BSPT or NPTSet Pressures from 53.0 to 370.0 bar
Type 359-B4605-B6605
Type 359 / B4605 / B6605
Enclosed Discharge Safety Relief ValvesStainless Steel construction with Metal Ball SealingInlet Connections from 3/8" to 1/2" BSP, BSPT or NPTSet Pressures from 35.0 to 500.0 bar
Type 94605 / 946H5
Type 94605 / 946H5 / 95605 / 956H5
Enclosed Discharge Safety Relief ValvesStainless Steel construction with Metal or Ceramic Disc SealingInlet Connections available in BSP, BSPT, NPT or Cone & ThreadSet Pressures from 35.0 to 1100.0 bar

These valves are available with a wide range of sealing materials and technologies as well as a comprehensive range of manual relieving devices to suit application requirements.


  • Tel: +44 (0) 117 930 6100

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