Pressure Relief Valve

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  • Overview – Pressure Relief & Safety Valves

  • Pressure Relief Valves are used to protect equipment and personnel from damage or injury due to overpressure of piping systems and pressure vessels. These valves are available in various sizes, materials, pressure classes and types of inlet and outlet connections.

    Pressure Relief Valves are generally used on liquid duty and an allowance is made for an increase in pressure over the set point –at least 10%, to achieve the required capacity.

    Pressure Safety Valves are generally used on gases and steam and are typified by rapid opening and a lower increase of pressure over the set point to achieve required discharge capacity.

    Sizing is generally calculated according to pressure, flow rate and number of other influencing factors.

    Valves for boilers and pressure vessels are covered by Australian Standard (AS 1271) and International code (API 526) and care should be made in selecting a valve that complies and is marked accordingly.



  • Model HL9BP Bronze Pressure Relief Valve

  • HL9BP Bronze Safety Relief Valve for air, water and oil, PTFE soft seat, closed cap design, male BSP inlet x female BSP outlet, standard spring 2-10 bar (optional spring upgrade to 11-20 bar)

    HL9B Full port Bronze Safety Relief Valve for air, water and oil, metal/metal seat, closed cap design, male BVSP inlet x female BSP outlet. (LP 0.3-2 bar; HP 21-30 bar)

    Sizes- 1/2” (DN15) → 2” (DN50)

    * Options: Easing Gear/Lifting Lever, Steam service



  • Model HL8SP 316SS Pressure Relief Valve

  • 316SS Safety Relief Valve for air, water and oil, PTFE soft seat, closed cap design, male BSP inlet x female BSP outlet, standard spring 2-10 bar (optional spring upgrade to 11-20 bar)

    Sizes
    ½” x 1” (DN15 x DN25)
    ¾” x 1” (DN20 x DN25)
    1” x 1” (DN25 x DN25)
    1½” x 2” (DN40 x DN50)
    2” x 2” (DN50 x DN50)

    * Options: Easing Gear/Lifting Lever, Steam service



  • Model 1216 & 1216HP SS Relief Valve

  • 1216 Safety Relief valve for Gases & Liquids, cast CF3M body & nozzle, 316L disc, Viton or PTFE Seat, screwed BSP/NPT, closed cap – rated to PN40.

    1216B As above but also flanged option ANSI150/300 (1/2” x 1″; 3/4″ x 1″; 1″ x 1″)
    1216HP – As above but high pressure version, rated to PN40, PN250, PN400

    Sizes- 1/2” (DN15) → 2” (DN50)

    * Options: Lifting lever, sealed packed lever, cryogenic option with metal/metal seat,  Steam service, Halar ECTFE coating option for corrosion protection.



  • Model 1400 Relief Valve, Flanged AS

  • Safety Relief valve for Steam, Gases & Liquids, WCB Body + SS/Stellite Nozzle or 316 Body/Nozzle, Viton/PTFE Seat or metal/metal seat, flanged ends to AS standards PN16/25, PN40 or PN100

    Sizes –   ½”  x 1”   (DN15) x (DN25)
    ¾” x 1¼” (DN20) x (DN32)
    1”  x 1½” (DN25) x (DN40)
    1¼”x 2”   (DN32) x (DN50)
    1½”x 2½”(DN40) x (DN65)
    2”  x 3”    (DN50) x (DN80)
    2½”x 4”   (DN65) x (DN100)
    3”  x 5”    (DN80) x (DN125)
    4”  x 6”    (DN100) x (DN150)
    5”  x 8”    (DN125) x (DN200)
    6”  x 8”    (DN150) x (DN200)
    8”  x 12”  (DN200) x (DN300)

    * Options: Nodular Iron body, Lifting lever, sealed packed lever, Halar ECTFE coating option for corrosion protection.