About Pressure-Relief Valves
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Flange-Mount Pressure-Relief Discs
Install these discs within the bolt circle of ANSI Class 150 flanges. They break open at the burst pressure to allow unrestricted flow. All are for one-time use. Discs are made of resin-impregnated graphite for resistance to temperature and pressure fluctuations as well as corrosive liquids and gases. They include two gaskets for installation between flanges.
Vacuum-rated discs have supports to resist rupture caused by vacuum.
Operating ratio is the ratio between the normal operating pressure and the burst pressure. Exceeding the operating ratio decreases the service life of the disc. For example, a disc with a burst pressure of 100 psi and an operating ratio of 80% should not be used in a system with an operating pressure greater than 80 psi.
Pressure-Relief Hydraulic Valves
To set the pressure, unscrew the cap and turn the adjustment screw. Valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and close when the system pressure is restored below the set pressure.
Iron valves absorb vibration to reduce noise and wear in the pipeline.
Inlet Connection | Relief Connection | O'all | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Dash Size | Pipe Size | Dash Size | Lg. | Wd. | Ht. | Temp. Range, °F | Choose a Set Pressure Range, psi | Each | |
NPT Female Inlet and NPT Female Relief Port | ||||||||||
Iron Body | ||||||||||
| 1 1/2 | 24 | 1 1/2 | 24 | 4 1/8" | 2 7/8" | 11 1/16" | -20° to 400° | 0000000 | 0000000 | |