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
Product Spec Spotlight
- Set Pressure
- 250-300 psi
- Temp Range
- -20°F to 275°F
- Body Material
- Black Oxide Coated Carbon Steel
- Weight
- 3.2 lbs
Custom set pressures available at no additional charge — call us if you need a value outside this range.
ASME Certified
UV & NB stamped
100% Tested
Every valve, every time
American Made
Manufactured since 1912
Specifications & Details
Additional Specifications
- Outlet
- 3/4" FPT
- Configuration
- Dual Port, Open Port
- MAWP
- 500 psi
| Inlet | Outlet | Configuration | MAWP |
|---|---|---|---|
| 1/2" MPT | 3/4" FPT | Dual Port, Open Port | 500 psi |
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 ***
| 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 *** |
800 OP Series Capacity Chart Slope = 0.42 SCFM/PSIA Standard Conditions [60 ˚ F, 1 Atm]
- Air SCFM
- 62.6
- Air lb/min
- 4.8
- Air lb/hr
- 286.5
- NH3 lb/min
- 3.7
- NH3 lb/hr
- 219.6
- R-22 lb/min
- 8.2
- R-22 lb/hr
- 494.9
- R-290 lb/min
- 5.9
- R-290 lb/hr
- 353.4
- R-404A lb/min
- 8.8
- R-404A lb/hr
- 525.8
- R-502 lb/min
- 3.0
- R-502 lb/hr
- 181.5
- Air SCFM
- 68.5
- Air lb/min
- 5.2
- Air lb/hr
- 313.7
- NH3 lb/min
- 4.0
- NH3 lb/hr
- 240.5
- R-22 lb/min
- 9.0
- R-22 lb/hr
- 541.9
- R-290 lb/min
- 6.4
- R-290 lb/hr
- 387.0
- R-404A lb/min
- 9.6
- R-404A lb/hr
- 575.7
- R-502 lb/min
- 3.3
- R-502 lb/hr
- 198.8
- Air SCFM
- 74.5
- Air lb/min
- 5.7
- Air lb/hr
- 340.9
- NH3 lb/min
- 4.4
- NH3 lb/hr
- 261.3
- R-22 lb/min
- 9.8
- R-22 lb/hr
- 588.9
- R-290 lb/min
- 7.0
- R-290 lb/hr
- 420.5
- R-404A lb/min
- 10.4
- R-404A lb/hr
- 625.7
- R-502 lb/min
- 3.6
- R-502 lb/hr
- 216.0
| 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 | R-502 lb/min | R-502 lb/hr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 250 | 62.6 | 4.8 | 286.5 | 3.7 | 219.6 | 8.2 | 494.9 | 5.9 | 353.4 | 8.8 | 525.8 | 3.0 | 181.5 |
| 275 | 68.5 | 5.2 | 313.7 | 4.0 | 240.5 | 9.0 | 541.9 | 6.4 | 387.0 | 9.6 | 575.7 | 3.3 | 198.8 |
| 300 | 74.5 | 5.7 | 340.9 | 4.4 | 261.3 | 9.8 | 588.9 | 7.0 | 420.5 | 10.4 | 625.7 | 3.6 | 216.0 |
