Type 680

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

Product Description

Type 680

Enclosed Discharge Safety Relief Valves for Liquids, available with 10, 13, 18, 20 or 25mm nominal bore.

Stainless Steel (for bronze see type 670)


Example Applications:
  • Pumping systems and Hydraulic systems
  • Thermal relief
  • Waste water management
  • Oil transfer
  • Petrochemical industries
  • Fire fighting equipment
  • Water cooling and feeding systems



View or Download Datasheet

Technical Information

Technical Information for Type 680

  • Min. Pressure
    0.70 bar (10.15 psi)
  • Max. Pressure
    30.00 bar (435.00 psi)
  • Temperature Range
    -40°C to 200°C (subject to seal material)
  • Inlet Connection(s)
    3/8" to 2" BSP, BSPT orNPT
  • Outlet Connection(s)
    2 BSP or NPT
  • Flow Rate
    Refer to Flow Tables on the datasheet
  • Materials
    St. Steel
  • Seal Materials
    Viton® / Nitrile / Neoprene / Ethylene Propylene
  • Test Certification
    Included - supplied Free of charge
Flow Rates:

See datasheet


  • Relieving pressure is set pressure +25%
  • Reseating pressure is set pressure -20% (0.6 bar below 3.0 bar)


  • 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 Reassurance

While the sound of a safety relief valve opening may initially seem alarming, it signifies that pressure is being controlled and potential dangers are being averted, offering operational reassurance.


View or Download the Type 680 Datasheet

Full Technical Information - Including Flow Rates

View or Download the Type 680 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.


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