Graphite Valves | McMaster-Carr

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12 Products

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-filled graphite for resistance to temperature and pressure fluctuations as well as corrosive liquids and gases. They include two gaskets for installation between flanges.

Pressure-Relief Discs

Operating Ratio—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.

	For Flange ANSI Class	OD	Thk.	Operating Ratio	Temp. Range, ° F	Gasket Material	Valve Type	Choose a Burst Pressure, psi		Each
Graphite Body—Resin-Filled Graphite Disc



	1	150	2 1/2"	1 1/8"	80%	-20 to 300	Neoprene	Rupture Disc	20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 175, 200, 250	4858K501	0000000


	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	4858K503	000000
	2	150	4"	1 1/8"	80%	-20 to 300	Neoprene	Rupture Disc	20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 175, 200, 250	4858K505	000000
	3	150	5 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	4858K507	000000
	4	150	6 3/4"	1 1/8"	80%	-20 to 300	Neoprene	Rupture Disc	20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 175, 200, 250	4858K509	000000
	6	150	8 5/8"	1 1/8"	80%	-20 to 300	Neoprene	Rupture Disc	20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 175, 200	4858K511	000000

Vacuum Rated Pressure-Relief Discs

Vacuum-rated discs have supports to resist rupture caused by vacuum.

	For Flange ANSI Class	OD	Thk.	Max. Vacuum, in. Hg	Operating Ratio	Temp. Range, ° F	Gasket Material	Valve Type	Choose a Burst Pressure, psi		Each
Graphite Body—Resin-Filled Graphite Disc



	1	150	2 1/2"	1 1/8"	29.92	80%	-20 to 300	Neoprene	Rupture Disc	15	4858K701	0000000


	1 1/2	150	3 1/4"	1 1/8"	29.92	80%	-20 to 300	Neoprene	Rupture Disc	10, 15	4858K703	000000
	2	150	4"	1 1/8"	29.92	80%	-20 to 300	Neoprene	Rupture Disc	5, 10, 15	4858K705	000000
	3	150	5 1/4"	1 1/8"	29.92	80%	-20 to 300	Neoprene	Rupture Disc	5, 10, 15	4858K707	000000
	4	150	6 3/4"	1 1/8"	29.92	80%	-20 to 300	Neoprene	Rupture Disc	5, 10, 15	4858K709	000000
	6	150	8 5/8"	1 1/8"	29.92	80%	-20 to 300	Neoprene	Rupture Disc	5, 10, 15	4858K711	000000