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MPN: H733-250

Fisher H733-250 3" MNPT Flush Mounted SS Internal Relief Valve, 250 PSI

Fisher H733-250 3" MNPT Flush Mounted SS Internal Relief Valve, 250 PSI


Regular price $1,632.40 CAD
Regular price Sale price $1,632.40 CAD
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The Fisher H733-250 is a high-performance flush-mounted internal relief valve designed for mobile applications, particularly for trucks transporting LP-Gas, Anhydrous Ammonia (NH3), or other compressed gases. This valve features robust stainless steel construction to resist rust and corrosion, ensuring long-lasting durability and reliability.

Key Features:

  • Stainless Steel Construction: Body, stem, disc holder, and springs are made of stainless steel for maximum corrosion resistance.
  • Stainless Steel Springs: Provides consistent performance and durability.
  • True Internal Design: Ideal for mobile applications.
  • Standard Spring Settings: Ensures reliable operation.
  • Nitrile (NBR) Seat: Offers excellent sealing performance.
  • Serial Numbers for Identification: Facilitates easy tracking and maintenance.
  • UL Approved: Meets stringent safety standards.
  • Protective Cap Included: Type P298.


  • Type: H733-250
  • Container Connection: 3 in. MNPT
  • Start to Discharge Setting: 250 psig (17.2 bar)
  • Flow Capacity:
    • UL: 10,150 SCFM (17,245 SCMH)
    • ASME: 9,369 SCFM (15,918 SCMH)
  • For Tank With Area Up To: 598 ft² (55.6 m²)
  • Temperature Rating: -20° to 160°F (-29° to 71°C)
  • Approval: UL Listed

Note: Use with a 2-1/2 in. hex size installation tool.

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