Relief Valve – 801SS

$245.55$881.76

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.

  • Maximum Durability

  • Corrosion Resistance

     

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Description

 

Part #  NB Cert. #  Body Material  Wt (lbs) Size 
801SS 51152 304 Stainless Steel 3.5 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 40.8 3.1 187.0 2.4 143.4 5.4 323.0 3.8 230.7 5.7 343.2
100 52.4 4.0 239.9 3.1 183.9 6.9 414.4 4.9 296.0 7.3 440.3
125 63.9 4.9 292.8 3.7 224.5 8.4 505.8 6.0 361.2 9.0 537.4
150 75.5 5.8 345.7 4.4 265.0 10.0 597.2 7.1 426.5 10.6 634.5
175 87.0 6.6 398.6 5.1 305.6 11.5 688.6 8.2 491.8 12.2 731.6
200 98.6 7.5 451.5 5.8 346.2 13.0 780.0 9.3 557.0 13.8 828.7
225 110.1 8.4 504.4 6.4 386.7 14.5 871.4 10.4 622.3 15.4 925.8
250 121.7 9.3 557.3 7.1 427.3 16.0 962.8 11.5 687.6 17.0 1022.9
275 133.2 10.2 610.2 7.8 467.8 17.6 1054.2 12.5 752.8 18.7 1120.0
300 144.8 11.1 663.1 8.5 508.4 19.1 1145.6 13.6 818.1 20.3 1217.1
325 156.3 11.9 716.0 9.1 548.9 20.6 1237.0 14.7 883.4 21.9 1314.2
350 167.9 12.8 768.9 9.8 589.5 22.1 1328.4 15.8 948.7 23.5 1411.3
375 179.4 13.7 821.8 10.5 630.1 23.7 1419.8 16.9 1013.9 25.1 1508.4
400 191.0 14.6 874.7 11.2 670.6 25.2 1511.2 18.0 1079.2 26.8 1605.5


Additional information

Inlet Port Size

1/2"

Outlet Port Size

3/4"

Material Type

Stainless

Assembly Options

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

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