Relief Valve – 803QC

Category:

Description

This new generation valve allows the piping to remain in place, while only the insert is replaced. This makes replacement of the valves faster and less costly than the standard valve. The ASME certified slope of 1.978 yields, for example, a capacity of 43.8 lbs. per minute of air @ 250# set pressure. Stainless steel housing for durability and performance.

Part #  NB Cert. #  Body Material  Size 
803QC 51129 304 Stainless Steel ½” FNPT inlet x ¾” FNPT outlet

#803QC 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)
803QC-Schematic

Additional Information

  • 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 body has a 1/4” FNPT port for gauges or service valves.
  • 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 AIR in units of SCFM.
  • Each valve undergoes 3 separate test sequences to verify quality and set pressure, and then is sealed for security.
  • The 803QC relief valve is available in set pressures from 50 to 400 psi. All relief valve common set pressures are in stock. Special settings can be made up at no extra charge and usually take 1 to 2 days.
  • 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. They are also certified in Canada.
803QC
1/2” x 3/4”
Relief Valve capacity Chart 
Set or Release Pressure (PSIG) Air SCFM 60 F 1 Atm Air lb/min 60 F 1 Atm Air lb/hr 60 F 1 Atm NH3 lb/hr 60 F 1 Atm NH3 lb/min 60 F 1 Atm R-12 lb/hr 60 F 1 Atm R-12 lb/min 60 F 1 Atm R-22 lb/hr 60 F 1 Atm R-22 lb/min 60 F 1 Atm R-502 lb/hr 60 F 1 Atm R-502 lb/min60 F 1 Atm
50 137.9 10.5 631.7 484.3 8.1 1290.4 21.5 1091.4 18.2 1239.9 20.7
75 192.3 14.7 880.9 675.4 11.3 1799.5 30 1522 25.4 1729.2 28.8
100 246.7 18.8 1130.1 866.5 14.4 2308.6 38.5 1952.5 32.5 2218.4 37
125 301.1 23 1379.3 1057.5 17.6 2817.8 47 2383.1 39.7 2707.6 45.1
150 355.4 27.1 1628.5 1248.6 20.8 3326.9 55.4 2813.7 46.9 3196.8 53.3
175 409.8 31.3 1877.8 1439.7 24 3836 63.9 3244.3 54.1 3686 61.4
200 464.2 35.4 2127 1630.8 27.2 4345.1 72.4 3674.9 61.2 4175.2 69.6
225 518.6 39.6 2376.2 1821.9 30.4 4854.3 80.9 4105.5 68.4 4664.5 77.7
250 573 43.8 2625.4 2013 33.5 5363.4 89.4 4536.1 75.6 5153.7 85.9
275 627.4 47.9 2874.6 2204 36.7 5872.5 97.9 4966.7 82.8 5642.9 94
300 681.8 52.1 3123.9 2395.1 39.9 6381.6 106.4 5397.3 90 6132.1 102.2
325 736.2 56.2 3373.1 2586.2 43.1 6890.8 114.8 5827.9 97.1 6621.3 110.4
350 790.6 60.4 3622.3 2777.3 46.3 7399.9 123.3 6258.5 104.3 7110.5 118.5
375 845 64.5 3871.5 2968.4 49.5 7909 131.8 6689.1 111.5 7599.7 126.7
400 899.4 68.7 4120.8 3159.4 52.7 8418.1 140.3 7119.7 118.7 8089 134.8

Additional information

Inlet Port Size

1/2"

Outlet Port Size

3/4"

Material Type

Stainless

Available in 2 pieces

Yes

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