Relief Valve – 801

$188.17$766.95

This low capacity relief valve has been designed for use in small pressure vessels. The ASME certified slope of 0.73 yields, for example, a capacity of 9.3 lbs per minute of air @ 250# set pressure.

  • Increased Durability

  • Corrosion Resistance

     

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Description

 

Part #  NB Cert. #  Body Material  Wt (lbs) Size 
801 51152

A36 Carbon Steel  Black Oxide Coated

3.2 ½” MNPT inlet x ¾” FNPT outlet

#801 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)
801-801SS-Schematic

 

Design Features

  • National Board Certification #:   51253
  • Set Pressure Range:      50-400 PSI in 25 PSI  increments.
    • Special Settings can be made at no extra charge and typically takes 1-2 extra days;
  • Each valve undergoes 3 separate test sequences for set pressures and seals, and then are lock-wired for security.
  • All Cyrus Shank relief valves are manufactured in accordance with ASME Boiler and Pressure Vessel Code Section VIII Division I and stamped with the ASME Certification Mark with UV Designator.
  • All Cyrus Shank relief valve capacities are certified by the National Board of Boiler and Pressure Vessel Inspectors and stamped with the NB Certification Mark.

801 Series Capacity Chart

Slope = 0.73 SCFM/PSIA
Standard Conditions [60
˚F, 1 Atm]
Set Pressure (PSIG) Air SCFM Air lb/min Air lb/hr NH3 lb/min NH3 lb/hr R-22 lb/min R-22 lb/hr R-290 lb/min R-290 lb/hr R-404A lb/min R-404A lb/hr
75 71.0 5.4 324.8 4.2 249.1 9.4 561.2 6.7 400.8 9.9 596.2
100 91.0 6.9 416.7 5.3 319.5 12.0 720.0 8.6 514.2 12.7 764.9
125 111.1 8.5 508.6 6.5 390.0 14.6 878.8 10.5 627.6 15.6 933.6
150 131.2 10.0 600.5 7.7 460.4 17.3 1037.5 12.3 741.0 18.4 1102.3
175 151.3 11.5 692.4 8.8 530.9 19.9 1196.3 14.2 854.3 21.2 1271.0
200 171.3 13.1 784.4 10.0 601.4 22.6 1355.1 16.1 967.7 24.0 1439.7
225 191.4 14.6 876.3 11.2 671.8 25.2 1513.9 18.0 1081.1 26.8 1608.4
250 211.5 16.1 968.2 12.4 742.3 27.9 1672.7 19.9 1194.5 29.6 1777.0
275 231.6 17.7 1060.1 13.5 812.8 30.5 1831.4 21.8 1307.9 32.4 1945.7
300 251.6 19.2 1152.0 14.7 883.2 33.2 1990.2 23.7 1421.3 35.2 2114.4
325 271.7 20.7 1243.9 15.9 953.7 35.8 2149.0 25.6 1534.7 38.1 2283.1
350 291.8 22.3 1335.8 17.1 1024.2 38.5 2307.8 27.5 1648.1 40.9 2451.8
375 311..9 23.8 1427.7 18.2 1094.6 41.1 2466.5 29.4 1761.5 43.7 2620.5
400 331.9 25.3 1519.6 19.4 1165.1 43.8 2625.3 31.2 1874.9 46.5 2789.2

 

Additional information

Outlet Port Size

3/4"

Assembly Options

Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve

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