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Relief Valve – 800 OP

$188.17 – $766.95

This low capacity relief valve has been designed for use in small pressure vessels. The ASME certified slope of 0.216 yields, for example, a capacity of 4.8 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 
800 OP 51253

A36 Carbon Steel  Black Oxide Coated

 3.2 ½” MNPT inlet x ¾” FNPT outlet

#800 OP 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 Schematic

 

Design Features
  • National Board Certification #:   51253
  • Set Pressure Range:      250-300 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.
  • 50-400 PSI Set Pressure Range Coming Soon ***
  • 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.

800 OP Series Capacity Chart

Slope = 0.216 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 15.1 1.1 69.0 0.9 52.9 2.0 119.1 1.4 85.1 2.1 126.6
75 21.0 1.6 96.2 1.2 73.7 2.8 166.1 2.0 118.6 2.9 176.5
100 26.9 2.1 123.4 1.6 94.6 3.6 213.1 2.5 152.2 3.8 226.4
125 32.9 2.5 150.6 1.9 115.4 4.3 260.1 3.1 185.8 4.6 276.4
150 38.8 3.0 177.8 2.3 136.3 5.1 307.1 3.7 219.3 5.4 326.3
175 44.8 3.4 205.0 2.6 157.2 5.9 354.2 4.2 252.9 6.3 376.3
200 50.7 3.9 232.2 3.0 178.0 6.7 401.2 4.8 286.5 7.1 426.2
225 56.6 4.3 259.4 3.3 198.9 7.5 448.2 5.3 320.0 7.9 476.1
250 62.6 4.8 286.6 3.7 219.7 8.3 495.2 5.9 353.6 8.8 526.1
275 68.5 5.2 313.8 4.0 240.6 9.0 542.2 6.5 387.2 9.6 576.0
300 74.5 5.7 341.0 4.4 261.5 9.8 589.2 7.0 420.7 10.4 625.9
325 80.4 6.1 368.2 4.7 282.3 10.6 636.2 7.6 454.3 11.3 675.9
350 86.3 6.6 395.4 5.1 303.2 11.4 683.2 8.1 487.9 12.1 725.8
375 92.3 7.0 422.6 5.4 324.0 12.2 730.2 8.7 521.4 12.9 775.7
400 98.2 7.5 449.8 5.7 344.9 13.0 777.2 9.3 555.0 13.8 825.7

Additional information

Outlet Port Size

3/4"
Assembly Options

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

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