Relief Valve – 850D

$548.81

This high capacity relief valve has been designed for use in large-sized pressure vessels. The ASME certified slope of 6.17 yields, for example, a capacity of 136.4 lbs per minute of air @ 250# set pressure.

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Description

 

Part #  NB Cert. #  Body Material  Wt (lbs) Size  Side Outlet
850D 51051 Ductile Iron Casting 60-40-18 12.2 ¾”,1”, or 1 ¼” MNPT inlet x 1 ½” FNPT outlet 1 ½” FNPT

#850D safety relief valve can be mounted on the following manifolds:

  • #850 MW- ¾ ” (for ¾” MNPT)
  • #850 MW- 1” (for 1” MNPT)
  • #875 M- (for 1” MNPT)
  • #876 M- (for 1” MNPT)
  • #900 MW- 1 ¼” (for 1 ¼” MNPT)
  • #901 M- (for 1 ¼” MNPT)
850-Schematic

Design Features

  • National Board Certification #:   51051
  • Set Pressure Range:      150-400 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.

850/851 Series Capacity Chart

Slope = 6.17 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
150 1108.7 84.6 5078.2 64.9 3893.5 146.2 8773.7 104.4 6265.5 155.4 9321.1
175 1278.4 97.6 5855.4 74.8 4489.3 168.6 10116.3 120.4 7224.4 179.1 10747.5
200 1448.1 110.5 6632.5 84.8 5085.1 191.0 11459.0 136.4 8183.2 202.9 12174.0
225 1617.8 123.5 7409.7 94.7 5681.0 213.4 12801.7 152.4 9142.0 226.7 13600.4
250 1787.4 136.4 8186.8 104.6 6276.8 235.7 14144.3 168.3 10100.9 250.4 15026.9
275 1957.1 149.4 8963.9 114.5 6872.6 258.1 15487.0 184.3 11059.7 274.2 16453.3
300 2126.8 162.4 9741.1 124.5 7468.5 280.5 16829.6 200.3 12018.5 298.0 17879.7
325 2296.5 175.3 10518.2 134.4 8064.3 302.9 18172.3 216.3 12977.4 321.8 19306.2
350 2466.1 188.3 11295.3 144.3 8660.1 325.2 19515.0 232.3 13936.2 345.5 20732.6
375 2635.8 201.2 12072.5 154.3 9256.0 347.6 20857.6 248.3 14895.0 369.3 22159.0
400 2805.5 214.2 12849.6 164.2 9851.8 370.0 22200.3 264.2 15853.9 393.1 23585.5

Additional information

Outlet Port Size

3/4", 1", 1 1/4", 1 1/2"

Material Type

Ductile

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