This high-capacity relief valve was designed for use in large pressure vessels and offers a light-weight alternative to ductile iron valves.
The ASME certified slope of 6.17 yields, for example, a capacity of 136.4 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 #: 51051
- Set Pressure Range: 150-400 PSI in 25 PSIG increments
- Light-weight anodized aluminum casting
| 850 A 3/4″, 1″, or 1-1/4″ x 1 1/2″ Relief Valve Capacity Chart |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Set or Release Pressure (PSIG) | Air SCFM 60 F 1 Atm | Air lb/min 60 F 1 Atm | Air lb/hr 60 F 1 Atm | NH3 lb/hr 60 F 1 Atm | NH3 lb/min 60 F 1 Atm | R-12 lb/hr 60 F 1 Atm | R-12 lb/min 60 F 1 Atm | R-22 lb/hr 60 F 1 Atm | R-22 lb/min 60 F 1 Atm | R-502 lb/hr 60 F 1 Atm | R-502 lb/min60 F 1 Atm |
| 150 | 1108.75 | 84.67 | 5079.94 | 3894.86 | 64.91 | 10377.61 | 172.96 | 8776.92 | 146.28 | 9971.83 | 166.2 |
| 175 | 1278.42 | 97.62 | 5857.34 | 4490.9 | 74.85 | 11965.73 | 199.43 | 10120.08 | 168.67 | 11497.85 | 191.63 |
| 200 | 1448.1 | 110.58 | 6634.74 | 5086.94 | 84.78 | 13553.85 | 225.9 | 11463.24 | 191.05 | 13023.86 | 217.06 |
| 225 | 1617.77 | 123.54 | 7412.13 | 5682.98 | 94.72 | 15141.96 | 252.37 | 12806.39 | 213.44 | 14549.88 | 242.5 |
| 250 | 1787.45 | 136.49 | 8189.53 | 6279.02 | 104.65 | 16730.08 | 278.83 | 14149.55 | 235.83 | 16075.9 | 267.93 |
| 275 | 1957.12 | 149.45 | 8966.93 | 6875.06 | 114.58 | 18318.19 | 305.3 | 15492.71 | 258.21 | 17601.92 | 293.37 |
| 300 | 2126.8 | 162.41 | 9744.33 | 7471.11 | 124.52 | 19906.31 | 331.77 | 16835.86 | 280.6 | 19127.93 | 318.8 |
| 325 | 2296.47 | 175.36 | 10521.72 | 8067.15 | 134.45 | 21494.42 | 358.24 | 18179.02 | 302.98 | 20653.95 | 344.23 |
| 350 | 2466.15 | 188.32 | 11299.12 | 8663.19 | 144.39 | 23082.54 | 384.71 | 19522.18 | 325.37 | 22179.97 | 369.67 |
| 375 | 2635.82 | 201.28 | 12076.52 | 9259.23 | 154.32 | 24670.65 | 411.18 | 20865.34 | 347.76 | 23705.98 | 395.1 |
| 400 | 2805.5 | 214.23 | 12853.92 | 9855.27 | 164.25 | 26258.77 | 437.65 | 22208.49 | 370.14 | 25232 | 420.53 |
