Liquids Pressure Relief Valve

1/4″-1″ (6~25mm)
WCB, S.S.304, S.S.316

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Liquids Pressure Relief Valve Specifications

Liquids pressure relief valve is similar with low lift safety valve, which is normally applicable to incompressible medium like liquids. Pressure relief valve is also called pressure reducing valve sometimes, which controls pressure by manual or automatic operation. Different from safety valve, the main purpose of pressure relief valve is not protecting equipment, but for commission or emergency use, in order to protect the pipeline. Liquids pressure relief valve is mainly applicable to liquids pipelines, protecting the pipeline safety. Flowspec Luokai can manufcture the liquids pressure relief valve according to ISO4126, API RP520, JIS8210 and DIN3320.


  • Relief valves are mostly precision castings, compact structure, nice appearance, bright surface.
  • Valve seat and body are separated type, seat is easy processing, and sealing surface is easy to grind into mirror surface, making sure on the valve sealing, convenient for disassembly and repair.
  • Reasonable designed disc holder is well-matched with nozzle ring, convenient for adjusting, which makes the safety valve discharge quickly, back to seat timely, achieving in on-off pressure difference.
  • Both valve seat and disc are Stellite welded, wear-resistance, erosion resistance, extending the valve service life.
  • Back pressure balance safety valve adopts high quality bellows, avoiding the effect of back pressure against discharge pressure.
  • The spring is processed with 2 x 24 hours constant temperature treatment, making sure the spring keep stable rigidity and correct lift in working condition.
  • Taking serious pressure testing on the valve body and seat, making sure that the safety valve work safely and reliably.


  • Design & manufacturing: ISO4126, API RP520, JIS8210, DIN3320
  • Male threaded x female threaded: G, NPT, PT, Rp, Rc (ASME B1.20.1, BS21/2799, DIN2999/259, ISO228-1, JIS B 0203, ISO7/1)
  • Face to face: API 526, JIS B2001, DIN3202
  • Inspection & testing: API 527


  • Class rating: 150LB~600LB
  • Size: 1/4″-1″ (DN6~25mm)
  • Materials: steel A216 WCB, stainless steel 304 (A351 CF8), stainless steel 316 (A351 CF8M), CF3M, Bronze, Monel, Hast. C
  • Set pressure tolerance: ≤±3%
  • Overpressure: ≤10%
  • Blowdown: ≤15%


  • Applicable medium: steam, LPG, oil, corrosive liquids
  • Applicable temperature: -29℃~+300℃
  • Applicable fields: boiler, oil & gas field, steam equipment, oil vessel, pressure vessel

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