Type 31140

> Safety valves made from Brass
> Atmospheric discharge with threaded connections

Product Description

Type 31140

37.5mm / 1 1/2″ Bore Atmospheric Discharge Safety Relief Valve for Compressed Air & Gases


Example Applications:
  • Compressors – Including PET compressors
  • Pressure vessels
  • Pneumatic systems



View or Download Datasheet

Type 31140 (37.5mm / 1 1/2" Bore Atmospheric Discharge Safety Relief Valve)

Technical Information for Type 31140

  • Min. Pressure
    2.80 bar (40.60 psi) *
  • Max. Pressure
    9.40 bar (136.30 psi) *
  • Temperature Range
    -40 °C to 200 °C (subject to seal material)
  • Flow Area
    1103.91 mm² (37.5 mm inlet bore diameter)
  • Inlet Connection(s)
    2" to 2 1/2" BSP, BSPT *
  • Flow Rate
    643.00 to 1784.00 std. litres/sec.
  • Materials
  • Seal Materials
    Viton® / Nitrile
  • Test Certification
    Included - supplied Free of charge
* Dependent on bore size.
See datasheet for full details



Relieving pressure is set pressure +10%
Reseating pressure is set pressure -10%


Flows Rates:

Flow calculated based upon: Air @ 15°C and 1013 mbar and are for guidance only, contact Seetru for help in sizing to your specifications.


  • Designed in accordance with BS EN ISO-4126-1 & -7
  • PED 2014/68/EU (CE)
  • PE(S)R UK SI 2016 No. 1105 (UKCA)
  • EAC


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.



View or Download the Type 31140 Datasheet

Full Technical Information - Including Flow Rates

Seetru offers a wide range of downloadable datasheets for our products, including safety relief valves, liquid-level gauges, and sight glasses.  These datasheets provide detailed information on the technical specifications, features, and applications of Seetru products.  They are an essential resource for engineers, designers, and other professionals who need to select the right Seetru products for their specific needs.


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