Type 636 Refrigeration

> Safety valves with bronze body
> Enclosed discharge valve with threaded connections

Product Description

Enclosed Discharge Safety Relief Valve for Refrigeration
Available with 10, 13, and 18mm nominal bore – See Datasheet

Brass and Bronze (for Stainless Steel see type 646).


Example Applications:
  • Refrigeration compressor manufacture
  • Industrial refrigeration
  • Commercial refrigeration
  • Ice making machinery
  • Air conditioning



View or Download Datasheet

Technical Information

Technical Information for Type 636 / 631

  • Min. Pressure
    6.60 bar (95.70 psi)
  • Max. Pressure
    55.20 bar (800.40 psi)
  • Temperature Range
    -30°C to 200°C (subject to seal material)
  • Inlet Connection(s)
    3/8” to 1 1/2” (depending on bore size)
  • Outlet Connection(s)
    3/4” to 1 1/2” (depending on bore size)
  • Flow Rate
    Refer to Flow Tables on the datasheet
  • Materials
  • Seal Materials
    Bonded elastomer
  • Test Certification
    Included - supplied Free of charge
Flow Rates:

See datasheet


  • The maximum permissible built-up back pressure is 10% of set pressure
  • Stable operation on flows down to 50% of valve-rated capacity
  • Relieving pressure is set pressure +10%
  • Reseating pressure is set pressure -10%


  • UKCA – PE(S)R
  • BS EN ISO 4126-1
  • ASME Section VIII Division 1
  • Pressure Equipment Directive, PED (CE marked)
  • EAC customs union (Russia, Belarus, and Kazakhstan)


Engineered for Reliability

More than just rugged hardware, these valves incorporate meticulous design and rigorous testing to ensure dependable performance under even the most demanding pressure situations.


View or Download the Type 636 / 631 Datasheet

Full Technical Information - Including Flow Rates

View or Download the Type 636 / 631 Datasheet

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.


Find your PDF Download for the 636 / 631 Range below…
Visit our downloads page for other Seetru product brochures and catalogues
Visit Our Downloads Page View the Type 636 / 631 Datasheet