800D Ductile Iron Safety Relief Valve, 1/2″ FNPT x 3/4″ FNPT

Item # 800D-CYRUS Brand: Cyrus Shank

$190.33

Set pressure range: 50 to 400 PSIG.

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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 9.3 lbs. per minute of air @ 250psi set pressure.

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.

Features:

  • National Board Certification #: 51163
  • Set Pressure Range: 50-400 PSI in 25 PSIG increments
  • Traditional Primer Painted Casting

800 Series Capacity Chart

Slope = 0.42 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          
50 29.3 2.2 134.1 1.7 102.8 3.9 231.6 2.8 165.4 4.1 246.1
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 6.6 698.6 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

Brand Cyrus Shank
Weight 3.3 lbs
Set pressure

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NB Certificate

Max Working Pressure

Temperature range

Material

Size

Item Type

Item #Description
800D-50Set pressure: 50
800D-75Set pressure: 75
800D-100Set pressure: 100
800D-125Set pressure: 125
800D-150Set pressure: 150
800D-175Set pressure: 175
800D-200Set pressure: 200
800D-225Set pressure: 225
800D-250Set pressure: 250
800D-275Set pressure: 275
800D-300Set pressure: 300
800D-325Set pressure: 325
800D-350Set pressure: 350
800D-375Set pressure: 375
800D-400Set pressure: 400