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Class Information
Number: 137/70
Name: Fluid handling > Destructible or deformable element controlled > Destructible element > Frangible element returns pressure responsive valve
Description: Apparatus in which a valve which opens in response to increased pressure is retained in closed position by means of a frangible element, opening of the valve resulting from the breaking of the frangible element.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
4977918 Pressure/vacuum relief valve Dec. 18, 1990
4949748 Backflash interrupter Aug. 21, 1990
4930578 Automatic sprinkler Jun. 5, 1990
4930536 Pipeline road crossing sealing system Jun. 5, 1990
4899960 Decompression panel for aircraft partition Feb. 13, 1990
4896689 Cylinder pressure relief valve Jan. 30, 1990
4796704 Drop ball sub-assembly for a down-hole device Jan. 10, 1989
4787409 Rupture pin valve system Nov. 29, 1988
4768539 Pipeline safety valve Sep. 6, 1988
4724857 Pressure relief valve Feb. 16, 1988
4688593 Well reverse flow check valve Aug. 25, 1987
4602684 Well cementing valve Jul. 29, 1986
4587987 Shear pin relief valve May. 13, 1986
4586526 Arrangement for controlling communication between a tubular member and an inflatable element supported on the tubular member in a well bore May. 6, 1986
4535957 Safety device for venting aircraft tires Aug. 20, 1985
4528999 Pressure relief device for pipes Jul. 16, 1985
4494608 Well injection system Jan. 22, 1985
4476991 Pressurizable container having a safety device for releasing excessive container pressure Oct. 16, 1984
4431716 Heat activated vent Feb. 14, 1984
4430392 Heat activated vent Feb. 7, 1984
4427070 Circulating and pressure equalizing sub Jan. 24, 1984
4402334 Rupture band relief valve Sep. 6, 1983
4399871 Chemical injection valve with openable bypass Aug. 23, 1983
4388940 Pressure relief device Jun. 21, 1983
4365643 Fuse device for a wheel equipped with a pneumatic tire Dec. 28, 1982
4359094 Shear relief valve Nov. 16, 1982
4324293 Circulation valve Apr. 13, 1982
4317470 Rupture band relief valve Mar. 2, 1982
4311197 Annulus pressure operated closure valve with improved reverse circulation valve Jan. 19, 1982
4286662 Tubing drain Sep. 1, 1981
4281715 Bypass valve Aug. 4, 1981
4260164 Inflatable packer assembly with control valve Apr. 7, 1981
4204703 Device for starting air bag devices May. 27, 1980
4203616 Air bag device for cars May. 20, 1980
4088192 Heat activated plunger May. 9, 1978
4075832 Partition for rocket motors Feb. 28, 1978
4022236 Safety device for a compressed gas tank May. 10, 1977
3981360 Well tubing drain Sep. 21, 1976
3948540 Controlled flow fluid supply for occupant restraint systems Apr. 6, 1976

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