Relief Valve – 803LQ QC 100


The 803LQ is for liquid use only.

  • Quick-Connect Cartridge Style Valve



The 803LQ QC is for liquid use only.

Part #  NB Cert. #  Body Material  Wt (lbs) Size 
803LQ QC 100 51073

304 Stainless Steel

4.9 ½” FNPT inlet x ¾” FNPT outlet

#803LQ QC safety relief valve can be mounted on the following manifolds:

  • #843- ½” x ½” x ½” FNPT (hand wheel)
  • #843F- ½” x ½” x ½” FNPT (seal cap)
  • #846M- ½” x ½” x ½” FNPT (seal cap)
  • #848M- ¾” x ½” x ½” FNPT (seal cap)
803LQQC Schematic

Additional Information

  • For liquid use only.
  • The 803LQ series of relief valves is available in set pressures of 75 and 100 psi.
  • Body is painted blue.
  • There is no seat leakage of 803LQ up to 85% of set pressure.
  • All upper and lower seats are constructed from 304 stainless steel to prevent corrosion and embedded with a Teflon ring.
  • All springs are stainless steel.
  • All relief valves come with an installation tag and cable tie.
  • Each valve’s identification tag has the required information of catalog number, month and year of manufacture with lot number, set pressure, inlet pipe size, and capacity for WATER in units of GMP.
  • Each valve undergoes 3 separate test sequences to verify quality and set pressure, and then is sealed for security.
  • All Shank Relief Valves are manufactured in accordance with ASME Quality Control Procedures and stamped with the ASME Certification Mark with UV designator.
  • They are certified by the National Board of Boiler & Pressure Vessel Inspectors.
803LQ  Relief Valve Capacity Chart  
803LQ 100 100 25.9

Additional information

Inlet Port Size


Outlet Port Size


Material Type


Copyright © 2024. All Rights Reserved.
JLB - Nashville Web Design & SEO Services