Relief Valve – 800SS

Category:

Description

This low capacity relief valve has been designed for use in small pressure vessels. The ASME certified slope of 0.42 yields, for example, a capacity of 9.29 lbs per minute of air @ 250# set pressure.

Part #  NB Cert. #  Body Material  Size 
800SS 51163 304 Stainless Steel ½” MNPT inlet x ¾” FNPT outlet

#800 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)
800-800SS-Schematic

Additional Details

  • 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 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 800 series of relief valves 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.
800 Series 
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 29.27 2.24 134.12 102.83 1.71 274 4.57 231.73 3.86 263.28 4.39
75 40.82 3.12 187.04 143.41 2.39 382.1 6.37 323.17 5.39 367.16 6.12
100 52.37 4 239.96 183.98 3.07 490.21 8.17 414.6 6.91 471.04 7.85
125 63.92 4.88 292.88 224.55 3.74 598.31 9.97 506.03 8.43 574.92 9.58
150 75.47 5.76 345.8 265.13 4.42 706.42 11.77 597.46 9.96 678.8 11.31
175 87.02 6.65 398.72 305.7 5.1 814.52 13.58 688.89 11.48 782.67 13.04
200 98.57 7.53 451.64 346.27 5.77 922.63 15.38 780.32 13.01 886.55 14.78
225 110.12 8.41 504.55 386.85 6.45 1030.73 17.18 871.75 14.53 990.43 16.51
250 121.67 9.29 557.47 427.42 7.12 1138.84 18.98 963.18 16.05 1094.31 18.24
275 133.22 10.17 610.39 467.99 7.8 1246.94 20.78 1054.61 17.58 1198.19 19.97
300 144.77 11.06 663.31 508.57 8.48 1355.05 22.58 1146.04 19.1 1302.06 21.7
325 156.32 11.94 716.23 549.14 9.15 1463.15 24.39 1237.47 20.62 1405.94 23.43
350 167.87 12.82 769.15 589.71 9.83 1571.26 26.19 1328.9 22.15 1509.82 25.16
375 179.42 13.7 822.06 630.29 10.5 1679.36 27.99 1420.33 23.67 1613.7 26.89
400 190.97 14.58 874.98 670.86 11.18 1787.47 29.79 1511.76 25.2 1717.58 28.63

Additional information

Inlet Port Size

1/2"

Outlet Port Size

3/4"

Material Type

Stainless

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