1 1/2 Pipe Size Pressure-Relief Valves

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About Pressure-Relief Valves

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.

Discs

Graphite Body—Resin-Impregnated Graphite Disc
Pipe Size	For Flange ANSI Class	OD	Thickness	Operating Ratio	Temperature Range, °F	Gasket Material	Valve Type	Choose a Burst Pressure, psi		Each
1 1/2	150	3 1/4"	1 1/8"	80%	-20° to 300°	Neoprene	Rupture Disc	20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 175, 200, 250	00000000	0000000

Vacuum Rated Discs

Graphite Body—Resin-Impregnated Graphite Disc
Pipe Size	For Flange ANSI Class	OD	Thickness	Max. Vacuum, in. of Hg	Operating Ratio	Temperature Range, °F	Gasket Material	Valve Type	Choose a Burst Pressure, psi		Each
1 1/2	150	3 1/4"	1 1/8"	29.92	80%	-20° to 300°	Neoprene	Rupture Disc	10, 15	00000000	0000000

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.

For technical drawings and 3-D models, click on a part number.

Iron

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°	3 to 10, 7 to 35, 30 to 100, 60 to 175, 150 to 350, 300 to 500	0000000	0000000