Abstract: A temporary seal within a wellbore. More specifically, a temporary seal within casing that limits the flow of fluid through the casing until the temporary seal is released.

Abstract: A fluid sensor assembly is provided. The fluid sensor assembly includes a flange, a base, and a cap. The flange is configured to mount to a fluid container. The base is configured to receive a fluid sensor, the base rotatably mounted to the flange and configured to rotate about the flange, the base forming a plurality of receiving apertures positioned about a perimeter of the base. The cap is configured to lock on the base and form a fluid-tight seal between the cap and the base.

Abstract: Various embodiments of the present invention relate to a secondary battery. The technical problem to be solved is to provide a secondary battery having an embossed safety vent, which is not damaged by an external force generated during a manufacturing process, can clearly define a rupture area or shape, and makes process management for rupture area or shape easy. To this end, various embodiments of the present invention disclose a secondary battery comprising: a case, a cap plate which is installed in the case and has a vent hole; and a safety vent which is coupled to the vent hole of the cap plate and ruptures when the internal pressure of the case is greater than a reference pressure, wherein the safety vent comprises an embossed portion; and a notch portion formed in the embossed portion.

Abstract: Various embodiments of the present invention relate to a secondary battery. The technical problem to be solved is to provide a secondary battery having an embossed safety vent, which is not damaged by an external force generated during a manufacturing process, can clearly define a rupture area or shape, and makes process management for rupture area or shape easy. To this end, various embodiments of the present invention disclose a secondary battery comprising: a case, a cap plate which is installed in the case and has a vent hole; and a safety vent which is coupled to the vent hole of the cap plate and ruptures when the internal pressure of the case is greater than a reference pressure, wherein the safety vent comprises an embossed portion; and a notch portion formed in the embossed portion.

Abstract: An air lock device for sealing a casing located inside a well, the air lock device including a body having a bore and configured to be attached with each end to the casing; a moving element located inside the bore; and a blocking element connected to the moving element, the blocking element preventing a fluid to pass through the bore of the body. The moving element forms an inner chamber with the body in which the blocking element is trapped after the blocking element is punctured by the moving element.

Abstract: In a lid for a battery case where an annular thin portion is formed integrally with a lid main body by coining, a pair of ribs formed integrally with the lid main body so as to bulge from the lid main body and extending in a short direction of the lid main body are disposed on both sides of the annular thin portion in a long direction of the lid main body.

Abstract: A vehicle air-bag inflator includes a container initially containing a pressurized gas and having a vent opening in a wall thereof. A rupturable element, attached to a container wall, covers the vent opening, sealing the interior of the container. The rupturable element is attached to a first support, which supports a region of the rupturable element and prevents the rupturable element from rupturing. A first support, attached to a container wall, is movable between a first and a second configuration, with respect to the container wall. In an initial configuration, a second support supports the first support and prevents the first support from moving from a first configuration to a second configuration. In a final configuration, a second support allows the first support to move from the first configuration to the second configuration. An activation mechanism moves the second support from an initial configuration to a final configuration when triggered.

Abstract: A differential pressure sensor includes a pressure sensing die comprising a semiconductor die, having a thinned portion forming a diaphragm. The diaphragm includes piezo-resistive elements that exhibit varying resistance based on force exerted on the diaphragm. A first support structure is bonded to a first surface of the semiconductor die, having an aperture defined through the support structure such that a first surface of the diaphragm is exposed through the aperture. A second support structure is bonded to the opposite side of the semiconductor die having an aperture aligned with the opposing side of the diaphragm. Electrical components in electrical communication with the piezo-resistive elements are arranged outside the region defined by the bond between the first and second support structures and the semiconductor die. An oil-filled volume may be defined between the semiconductor die and a harsh medium which transmits a fluid pressure to the die without the harsh medium contacting the die.

Abstract: A radiation detection assembly includes an ionization chamber for detecting radiation. The ionization chamber includes a volume of pressurized gas. An exterior enclosure houses the ionization chamber within an interior volume. The exterior enclosure includes a frangible section. A relief assembly defines a gas flow path from the ionization chamber to the frangible section of the exterior enclosure. The frangible section releases pressure from within the ionization chamber when the pressurized gas within the ionization chamber exceeds a predetermined pressure such that at least some of the pressurized gas flows through the relief assembly and through the frangible section of the exterior enclosure. The pressurized gas is then released to an exterior of the exterior enclosure. A method of reducing pressure within a radiation detection assembly is also provided.

Abstract: A pressure relief device of domed construction for venting an internally pressurized container. The pressure release device includes a coined pressure vent and is characterized by a relatively high venting pressure in combination with a failure pressure in the absence of venting which is higher than the intended venting pressure. The pressure relief device includes a sloped sidewall having an outer annular segment and a sloped annular intermediate segment. The sloped annular intermediate segment has a width dimension greater than the width dimension of the outer annular segment. A circular central plateau defines a flat dome top. The circular central plateau has a center point with an arc shaped coin line extending about an arc with the apex of the arc positioned at the center point of the circular central plateau.

Abstract: A pressure relief device and method of making the same are provided. The pressure relief device includes an over-pressure relief area with a plurality of co-linear spaced apart recesses located thereon. Gap segments are interspersed between the recesses to define a line of opening having desired performance characteristics during opening of the over-pressure relief area.

Abstract: A two-stroke crosshead large Diesel engine, comprising at least one combustion chamber, which is enclosed on multiple sides by a cylinder, and by at least one upper side of at least one piston moving up and down in the cylinder, which form an outer wall for the combustion chamber. The combustion chamber on its outer wall presents a predetermined breaking point, which is suited to protect the Diesel engine against possible damages which might be caused by an undesirably high overpressure (py) of gases in the combustion chamber during a malfunction of the Diesel engine. The predetermined breaking point comprises a predetermined breaking pressure (ps) below the overpressure (py) above which damages are expected, and above a combustion chamber normal pressure (pn) provided at a maximum during normal engine operation conditions.

Abstract: A rupture panel of three layers employs a lower layer (e.g. foam) that is adhesive, a middle layer (e.g. metallic) and a hold down layer. The middle layer has a weakened portion (scoring, openings, for example) that defines the panel burst pressure. A part of the lower layer does not connect to the middle layer. That part that does not connect to the middle layer adheres to the hold down layer. The hold down layer can be in the form of a ring with an open center, the weakened portion of the middle layer occupying a position within the open center of the hold down layer.

Abstract: A safety valve for a battery which is mounted on a sealing plate for sealing an opening portion of a gastight battery case, and which can rapidly release a gas in the battery when a battery internal pressure is elevated is provided. In a safety valve for a gastight battery, a thin-wall valve element is formed on a sealing plate which seals an opening portion of a battery case, and the valve element is opened when a battery internal pressure becomes a predetermined value or more so as to release a gas in the battery to the outside of the battery. The safety valve includes: an outer annular groove formed of an annular thin wall which is formed on the periphery of the valve element and is provided for releasing the whole valve element; an inner annular groove formed of an annular thin wall which is arranged in an area inside the outer annular groove; and a connecting groove formed of a straight thin wall which connects the outer annular groove and the inner annular groove to each other.

Abstract: The invention is directed toward a T-pipe designed for transfer of high pressure fluids through the main run and where the branch run is left in a standby position for possible use in the future. The opening, or outlet, of the branch run is sealed by a material continuous with the main run. An opening and fluid flow in the branch run while the main run is in production and remains under full pressure, is to be provided. The sealing includes a metal membrane which is in contact with the fluid flowing in the main run. The metal membrane is thinner than the wall thickness of the T-pipe and is supported by a plug inserted in the branch run.

Abstract: An overpressure indicating disk apparatus for indicating an over pressure condition in a pressurized system includes a body having first and second end portions and a bore, the first end portion configured for attachment to the pressurized system and in pressure communication therewith so that the pressure in the bore is the same pressure as the pressure of the pressurized system. A reverse buckling disk having an annular peripheral portion and a concave convex dome portion is provided. The annular peripheral portion surrounds the dome. The disk annular peripheral portion is mounted to the body, closing the bore at the first end portion. An indicating component or ring is affixed to the combination of a body and reverse buckling disk. The indicating ring has an annular peripheral portion that aligns generally with the annular peripheral portion of the reverse buckling rupture disk. A movable central tab portion is mounted inside the indicating component or ring.

Abstract: A rupture feature releases pressurized gas into a diffuser through an egress opening in an inflator wall responsive to a pressure impulse in the inflator. A sturdy rupture fragment is positioned opposite the egress opening. A thin rupture membrane continuously circumscribes and sealingly interconnects the rupture fragment to the inflator about the egress opening. Rupture membrane thickness is less than rupture fragment thickness or inflator wall thickness at the egress opening. The rupture membrane is upstanding from the inflator wall about the egress opening to a constant height. The rupture fragment and the rupture membrane are integrally-formed with each other and with the inflator wall at the egress opening. The pressure impulse impacts the rupture fragment, urges the rupture fragment away from the inflator, detaches the rupture fragment from the inflator by fully transversely fracturing the rupture membrane, and drives the rupture fragment into containment within the diffuser.

Abstract: A reverse acting rupture disc and methods of forming the same are provided. Generally, the rupture disc comprises a bulged portion and a circumscribing flange area surrounding the bulged portion. The bulged portion includes a mechanically formed line-of-opening recess comprising a singular channel. In certain embodiments, the mechanical process by which the recess is formed utilizes a high-speed mill which removes a portion of metal from the bulged portion of the disc without disrupting the substantially uniform metallic grain structure of the metal adjacent the channel.

Abstract: A rupture panel of three layers employs a lower layer (e.g. foam) that is adhesive, a middle layer (e.g. metallic) and a hold down layer. The middle layer has a weakened portion (scoring, openings, for example) that defines the panel burst pressure. A part of the lower layer does not connect to the middle layer. That part that does not connect to the middle layer adheres to the hold down layer. The hold down layer can be in the form of a ring with an open center, the weakened portion of the middle layer occupying a position within the open center of the hold down layer.

Abstract: A device for controlling fluid flow includes a conduit that defines a channel through which fluid flows opposing upstream and downstream directions of fluid flow. A rupture valve obliquely disposed in the channel to selectively prevent fluid flow through the channel, the rupture valve resisting rupture in response to pressure exerted on the rupture valve in the upstream direction and selectively rupturing in response to pressure exerted on the rupture valve in the downstream direction.

Abstract: An aerosol container (10) dispenses a fluid product under pressure. A pressure relief mechanism (30) vents the container in a controlled manner when the container is subjected to excessive pressure so to prevent the container from bursting. The container has a container body (12) of a hollow, generally cylindrical shape. Pressurized contents of the container are expelled through a valve assembly (18) installed at one end of the container. An end piece (22) attached to the container body at the other end of the container has a first circular shaped section (26) surrounded by a ring shaped outer section (28). The pressure relief mechanism comprises U-shaped score lines (32) formed across the transition between the two sections of the end piece. These score lines create lines of weakness in the material from which the end piece is made for the end piece to fracture along the score lines when the pressure within the container exceeds a predetermined pressure level.

Abstract: A temporary sealer for pipe repair and construction includes a sealing head, and a breakable film. The sealing head has a tubular shape and a size and shape corresponding to an inner diameter of a pipe. The breakable film is formed at the sealing face of the sealing head, wherein the breakable film forms a water barrier for temporarily restricting a flow of water passing through the sealing head within the pipe when the sealing head is slid into the pipe. The breakable film is inevitably torn apart in responsive to a predetermined water pressure for enabling the water flow passing through the sealing head within the pipe. Therefore, it not only provides a way to efficiently block the water flow when the water pipe needs construction, but also provides an apparatus involving the flow system when the water pipe system is finished with construction.

Abstract: A pressure relief bursting disc has a flange portion, a sloping portion interior of the flange portion and a dished portion interior of the sloping portion. The sloping portion has its wider end joined to the flange portion and slopes up from the flange portion in a first direction and is joined at its narrower end directly to the dished portion. The dished portion has its concave side facing in the first direction. In use pressure is applied to the concave side of the dished portion. The disc has a line of weakness, in the sloping portion. This shape achieves reliability of the burst strength, because the sloping portion buckles at the burst strength.

Abstract: The present invention is directed to pressure relief devices and to corresponding pressure relief assemblies that have improved vacuum resistance, improved fragmentation resistance, and/or improved burst control while maintaining low mass. The pressure relief device includes a substantially flat flange section and a domed section. The domed section may include a transitional line that defines a change in the shape of the domed section. The pressure relief device may also include a bracket for securing or aligning a domed section to a flange section. The pressure relief device may further include a stress distribution feature that is disposed transversely to a line of weakness in the domed section. The pressure relief assembly may include a fastener having a wire that is configured to break and release the pressure relief device when subject to a predetermined tensile load.

Abstract: Rectangular or circular vent apparatus for protecting a confined space having a vent aperture for relief of an overpressure condition is provided with each including vent structure having a vent unit adapted to be positioned over the vent aperture in normal closing relationship thereto. Each vent unit preferably includes at least one spring steel panel, or spring steel leaves positioned against a metal sheet, provided with a movable pressure relief portion having an initial position extending across the vent aperture. A backstop is provided for arresting the degree of movement of the spring steel. The spring steel panel or the spring steel leaves have a sufficient modulus of resilience and elasticity to cause the relief portion of the spring steel panel or the metal sheet to return to their respective initial positions from the open positions thereof upon relief of the overpressure condition in the confined space.

Abstract: A rupturable member in which the rupturing manner thereof can be controlled, and a gas generator using the rupturable member are provided. A fragile portion that ruptures preferentially and regulates the rupturing direction of the rupturable member is formed, the rupturable member being provided with a stress dispersion portion formed in a shape or structure to disperse stress when the rupturable member is ruptured, in the tip end of the fragile portion or forward for the rupturing direction of the fragile portion.

Abstract: A reverse acting rupture disc is provided having a laser defined electropolished line-of-weakness recess, and an improved method of forming an electropolished line-of-weakness recess in a reverse acting rupture disc that assures full opening of the disc upon reversal. A rupture disc blank is pre-bulged, final bulged, and then provided with a layer of resist material. A laser is used to remove at least a portion of the layer of resist material corresponding to a desired line-of-weakness recess in the concave face of the bulged rupture disc. The disc is then subjected to an electropolishing operation to remove metal from the lased area of the rupture disc, thereby forming a lustrous polished line-of-weakness recess in the disc of desired configuration and of a predetermined depth that is related to material thickness.

Abstract: Apparatus for protecting a confined space having a vent aperture for relief of an overpressure condition and provided with a vent unit having a pressure relief portion normally closing the vent aperture is provided with recloser structure for generally closing off the vent aperture in the event of opening of the pressure relief portion of the vent unit. The recloser structure includes a resilient, flexible, spring steel recloser panel that is normally held in a bent condition out of closing relationship to the vent aperture. Releasable mechanism engages the recloser panel for normally retaining the panel in its open position. An actuator is connected to the releasable mechanism for actuating the latter to release the recloser panel for movement as a function of its inherent resilience into substantially closing relationship to the vent aperture after the relief portion of the vent unit has opened.

Abstract: An oil well completion tool having a tubular assembly defining an elongated main passage is adapted to be connected to a multiple-section tubing string within an oil well casing. A severable plug is mounted in the tubular assembly in normal blocking relationship to the passage. A movable shear cylinder unit has a plug-severing edge operable to sever an entire central segment of the plug from a remaining peripheral portion thereof. Separate hinge structure has an elongated U-shaped leg portion connected to the central segment of the plug. The leg portion of the hinge structure, which undergoes elongation, is operable to retain the severed central segment of the plug in the main passage while allowing the central segment of the plug to bodily shift independent of and in a direction away from the peripheral portion of the plug.

Abstract: The invention relates to a plant for recovering a polluting fluid contained in the tank (4) of a sunken vessel (1) comprising a plurality of pipes (5) fixed to a deck (2), wherein each pipe comprises a first and second ends and, according to the beaching position of the sunken vessel, can form means for introducing a pressurised water into the tank or means for removing the polluting fluid outside thereof. Said invention is characterised in that said pipes are positioned in such a way that the ends thereof enters near each top corner of the tank and the second ends thereof are accessible from the inside of the sunken vessel.

Abstract: The bursting disc assembly has a primary bursting disc (10) and a secondary bursting disc (20) immediately behind and supporting the primary bursting disc. Each of the said discs (10,20) is made of metal and is gas impermeable, and the bursting strength of the assembly is derived from both of the bursting discs acting in combination. The primary and secondary bursting discs are in contact over the whole of the operating area of the disc, and are shaped together as a pair The materials of the two discs can be chosen suitably for their functions. The primary disc is for example corrosion-resistant.

Abstract: An inflator has a sealed vessel for containing compressed gas. The inflator has an axis. The vessel has a gas outlet passageway. The inflator has an elongated sealing cap closure with an internal chamber portion open to the compressed gas and sealed vessel to seal the opening of the gas outlet passageway. The elongated sealing cap is coaxial with the inflator. When a triggering device is activated it exerts a force against the elongated sealing cap closure in a direction substantially parallel to the axis of the inflator that causes the elongated sealing cap closure to fail and allows gas to escape from the vessel.

Abstract: An outlet connector for a container is provided through which a product can be introduced into the container through the outlet connector. The outlet connector preferably includes a sealing mechanism that can burst once a threshold pressure is exceeded, for example, by the flow of products toward the container. A sealing mechanism is described herein having two layers, wherein one layer is perforated to provide a defined tearing of the sealing mechanism. A method of producing an outlet connector is also provided herein.

Abstract: A non-reclosing, over-pressure relief device comprising a unitary pressure support having a central dome including a convex surface and an opposed concave surface, a flange surrounding the dome, the flange including a transition portion joining the flange to the dome and an elliptically shaped blow-out portion included in the dome formed by at least one cut-through line of an elliptical shape. In a preferred embodiment, the blow-out portion has at least one connecting member connectably bridging the cut-through line to connect the blow-out portion to an adjacent portion of the dome to thereby retain the blow-out portion, and at least one pressure seal in juxtaposition with the device.

Abstract: Valves for controlling the release of a substance, include a housing having an inlet for connection to a source of the substance, an outlet, and a passage extending therebetween. The passage is enclosed by a ceramic disc and means are provided to apply an electrical pulse to the disc to break the disc and so connect the inlet to the outlet. The methods include containing the substance in a container, connecting the container to a valve; and applying an electrical pulse to the disc to break the disc and connect the inlet to the outlet. The valves and methods are particularly suited, but not limited, to the control of substances such as pressurised fire extinguishing media.

Abstract: A lateral force resisting system includes a rigid structural panel and holdowns. A foundation bolt placement template may be used to locate and support the foundation bolts during fabrication of the foundation and to further secure the frame foundation interface. The rigid structural panel may be a vertical truss or a rigid structural frame with a wooden panel covering one side and interconnecting the members of the rigid structural frame. The wooden panel may be made up of multiple panes to tailor the response of the panel to the lateral force load. The holdowns secure the rigid structural panel to the foundation bolts and may be either a folded strap and pin embodiment or self-tightening.

Abstract: A safety pressure relief device comprises an annular flange portion (22), a concave/convex dome portion (24) and a transition portion (26) between the flange portion (22) and the dome portion (24), the transition portion (26) comprising a linear extent (28) extending from the annular flange portion (22) at a first acute angle (?1) to the plane of the flange portion (22), a tangent to the dome portion (24) at its junction with the transition portion (26) making a second acute angle (?2) with the plane of the flange portion (22) which is greater than said first angle (?1), a line of weakness being formed in and around part at least of the linear extent (28) of the transition portion (26).

Abstract: A pressure relief device for venting an internally pressurized container such as an aerosol can has three sections, a concave annular outer area, a circular central area and an annular intermediate area connecting the concave annular area to the circular area. The three sections all have the same thickness. The central area has a center point and an arc shaped score line extending through 132° to 138°, preferably 135°, about an arc center. The arc center is offset from the center point of the circular area by a distance of from about 0.290 inches. The score line has a depth of from 0.010 to 0.012 inches and is trapezoidal in transverse cross section. The intermediate area meets the circular area at an angle greater than 90° and the intermediate area meets the concave annular outer area at an angle greater than 90°.

Abstract: The present invention provides a compressed gas cylinder that is capable of storing a compressed fluid at high pressures. The cylinder of the present invention includes a body terminating in an inwardly domed cap. The dome included in the cap of the compressed gas cylinder of the present invention is formed such that the material near the tip of the dome is relatively thinner than the material near the base of the dome. The tip of the dome, therefore, creates a pierce region in the cap that can be pierced through the application of a relatively low pressure.

Abstract: A cell according to the present invention comprises a positive electrode, a negative electrode, an electrolyte solution, and an outer casing, wherein the outer casing comprises a valve plate 30 having a thickness, an annular-shaped break groove 4 formed on the valve plate, and one or more of break aiding grooves 1 in the inner area of the break groove, and wherein the break aiding groove comprises such configurations that remaining thickness of the valve plate at the break aiding groove is thicker than remaining thickness of the valve plate at the break groove, and at least one end of the break aiding groove is connected with the break groove. In a cell provided with a valve plate which is a safety valve 9 comprising the break groove and the break aiding groove, the safety valve operates smoothly and releases a gas inside the cell quickly, and resistance to dropping impact is improved.

Abstract: The invention relates to a fluid conduit piece (8) for passing therethrough a spontaneously exothermic working fluid such as a synthetic polymer, a cellulose derivative and a solution on the basis of cellulose, water and amino oxide, said fluid conduit piece comprising a working fluid zone (9) through which said working fluid flows. The aim of the invention is to prevent the fluid conduit piece and other fluidic devices from being damaged in the event of a spontaneous exothermic reaction in the working fluid. To this end, the fluid conduit piece is provided with an anti-rupture device (1) for the purpose of pressure relief. Said anti-rupture device has a pressure equalizing volume (7) that, once a predetermined rupture pressure is exceeded, can be converted from a normal operation state in which the pressure equalizing volume is separated from the working fluid zone into a rupture state in which the pressure equalizing volume is linked with the working fluid zone.

Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A planar disk is molded with the cylindrical section and is of a circular circumference which completely blocks the water line but which is selectively removable from the cylindrical section thus removing the barrier to the passage of water through the line. Removal of the barrier is facilitated through the use of a piercing device and pull tab which can be actuated from a position outside of the waste line.

Abstract: An extinguisher includes a compressed-gas generator for fighting fire and incipient explosions, and the extinguisher includes at least one rupture diaphragm having a rupture joint, in order to seal the extinguishing-agent vessel. In its center, the rupture diaphragm has a planar surface or a depression, which causes the rupture joint to simultaneously open at its entire circumference, in order for the extinguishing agent to escape in an axially symmetric manner.

Abstract: The present invention is directed to pressure relief devices and to corresponding pressure relief assemblies that have improved vacuum resistance, improved fragmentation resistance, and/or improved burst control while maintaining low mass. The pressure relief device includes a substantially flat flange section and a domed section. The domed section may include a transitional line that defines a change in the shape of the domed section. The pressure relief device may also include a bracket for securing or aligning a domed section to a flange section. The pressure relief device may further include a stress distribution feature that is disposed transversely to a line of weakness in the domed section. The pressure relief assembly may include a fastener having a wire that is configured to break and release the pressure relief device when subject to a predetermined tensile load.

Abstract: A unitary, forward buckling rupture disc is provided that is adapted to be mounted in a holder in which the disc is in closing relationship to a tubing string in an oil well and has greatest utility for testing the integrity of the connection between the sections of oil well tubing strings. The disc is designed to withstand the fluid pressure head in the string and a leak test pressure, and to then burst and fully open under a predetermined overpressure. The concavo-convex bulged section of the disc has a non-circular, continuous score line formed in the concave face thereof. The score line is of continuously varying depth around its circumference and includes an outwardly projecting cam segment which is of greatest depth that ruptures first and is in direct opposition to a lesser depth score line portion forming a hinge area for the burst region of the disc.

Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A planar disk is molded with the cylindrical section and is of a circular circumference which completely blocks the water line but which is selectively removable from the cylindrical section thus removing the barrier to the passage of water through the line. Removal of the barrier is facilitated through the use of a piercing device and pull tab which can be actuated from a position outside of the waste line.

Abstract: There is provided herein an improved rupture panel or disk that consists of a sheet metal top section with a relatively thick polymer foam seal attached thereto. In the preferred arrangement the instant invention does not require a separate support member. The foam sealing component is preferably attached to the top section by some sort of adhesive to hold it in place and it is installed on the process side of the top section. Additionally, the sealing member is preferably of a thickness which is substantially thicker than would typically be used in a conventional rupture panel arrangement. In another preferred embodiment the sealing member is also designed to function as a gasket, thereby eliminating the need for that separate member.

Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A unitary planar disk is molded with the cylindrical section and is of a circular circumference which completely blocks the water line when in place but which is selectively removable from the cylindrical section thus removing the barrier to the passage of water through the line.

Abstract: A cell according to the present invention comprises a positive electrode, a negative electrode, an electrolyte solution, and an outer casing, wherein the outer casing comprises a valve plate 30 having a thickness, an annular-shaped break groove 4 formed on the valve plate, and one or more of break aiding grooves 1 in the inner area of the break groove, and wherein the break aiding groove comprises such configurations that remaining thickness of the valve plate at the break aiding groove is thicker than remaining thickness of the valve plate at the break groove, and at least one end of the break aiding groove is connected with the break groove. In a cell provided with a valve plate which is a safety valve 9 comprising the break groove and the break aiding groove, the safety valve operates smoothly and releases a gas inside the cell quickly, and resistance to dropping impact is improved.

Abstract: There has been developed a safety valve installed on a small-sized cell vessel which remains hermetically sealed during the normal operation but which instantly releases the pressure in the inside of the vessel if, due to abnormalities, such as overcharging, the pressure is increased and reaches a prescribed value to prevent explosion or deformation of the cell vessel to evade the risk to the human being or destruction of the equipment. The metal foil type safety valve by the cold pressure welding of the present invention cold-pressure-welds the metal foil for sealing the air vent hole in the metal vessel. If the internal pressure in the vessel reaches the prescribed value, the metal foil is cleft to form an opening in the vessel to release the internal pressure.