Safety Relief Valves
Relief Valve - 800 OP
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
- Outlet Port Size
- 3/4"
- Assembly Options
- Dual Assembly With Unions, Dual Assembly Without Unions, Single Valve
assembly options
Dual Assembly With UnionsDual Assembly Without UnionsSingle Valve
ASME Certified
UV & NB stamped
100% Tested
Every valve, every time
American Made
Manufactured since 1912
Specifications & Details
| 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)
| 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 |
