A rotatable pressure relief valve assembly is disclosed. The rotatable pressure relief valve assembly may comprise a rotatable plug mounted within a valve body, along with a release mechanism configured to engage with the shaft and hold the plug in a closed position until an opening pressure of the valve assembly is reached. An assembly may include a damper configured to absorb a rotational kinetic energy or a catching mechanism configured to retain the plug in an open position when the plug rotates into the open position. A plug may be wing-shaped or have a mass balanced across a rotatable shaft offset from a diameter of the plug. An assembly may include a buckling pin, torque pin, tensile member or other release mechanism, which may be pre-loaded. A thermal shield also may be provided.

A pressure relief valve configured to vent a pressurized tank in the event of a fire is provided. The pressure relief valve includes a body, a vent passage, a plug and a latch. The vent passage is disposed through the body. The vent passage can be placed in fluid communication with an internal volume of a tank and with the atmosphere. The plug is moveably mounted in the vent passage. The latch has a blocking member disposed in contact with a control end of the plug in a first configuration and out of contact with the control end in a second configuration. The second configuration allows movement of the plug in the vent passage. One or both of a shape memory alloy wire and a trigger piston is configured to actuate the latch from the first to the second configuration. The shape memory alloy wire is configured to shorten when exposed to a temperature above a threshold temperature. The trigger piston moves, e.g., by a pressurized gas, in a trigger actuation passage to actuate the latch from the first configuration to the second configuration.

Relevant specifications in the field of gas supply provide for different safety devices for installation in a gas-supply system, in particular, an acetylene-supply system. To provide such a safety device, which is characterized by a compact structure and a high level of operational reliability, this invention proposes that a valve body (1) incorporates an over-pressure valve (4; 104) of a quick-action shut-off device, a control valve (3; 103) of a pressure-limiting device, and a safety valve (2; 102), whereby the safety valve (2; 102) can be fluidically connected to the over-pressure valve (4; 104) and the control valve (3; 103), and closes either when the over-pressure valve (4; 104) opens due to an inlet pressure that is above the inlet-pressure limit value or when the control valve (3; 103) opens due to an outlet pressure that is above an outlet-pressure limit value.

A pressure relief valve configured to vent a pressurized tank in the event of a fire is provided. The pressure relief valve includes a body, a vent passage, a plug and a latch. The vent passage is disposed through the body. The vent passage can be placed in fluid communication with an internal volume of a tank and with the atmosphere. The plug is moveably mounted in the vent passage. The latch has a blocking member disposed in contact with a control end of the plug in a first configuration and out of contact with the control end in a second configuration. The second configuration allows movement of the plug in the vent passage. One or both of a shape memory alloy wire and a trigger piston is configured to actuate the latch from the first to the second configuration. The shape memory alloy wire is configured to shorten when exposed to a temperature above a threshold temperature. The trigger piston moves, e.g., by a pressurized gas, in a trigger actuation passage to actuate the latch from the first configuration to the second configuration.

Systems, methods, and devices for relieving overpressure associated with thermal expansion of fluid within a closed cavity of a subsea manifold assembly. The subsea manifold assembly may comprise a header bore fluidly connected to one or more branch connections. A unidirectional valve is included at the branch connections to allow fluid leakage from the closed cavity into a header bore of the subsea manifold assembly to thereby reduce a pressure within the cavity while in the closed position.

A fuse pin valve includes a housing, a piston, and a mechanical fuse, such as a fuse pin. As assembled, the piston is movably disposed in the housing and is retained in a static position by the fuse pin. Upon a certain pressure (e.g., an abnormal pressure) acting on the piston, the fuse pin fails, thereby releasing the piston to move from a first or start position to second or end position. In the start position of the piston, the valve is in a first operational state (e.g., a closed state). In the end position of the piston, the valve is in a second operational state (e.g., an open state, fully open states, etc.). In other embodiments, in the start position of the piston the valve is in an open state, and in the end position of the piston the valve is in a closed state.

A pressure equalization apparatus comprises a main element, a sealing device, and a connection device for connecting the main element and the sealing device. The sealing device sealingly bears against the main element when the pressure equalization apparatus is in a closed state and is fixed relative to the main element via the connection device. A fixing connection between the main element and the sealing device which is formed thereby can be released in order to unblock a fluid connection between the interior of the pressure equalization apparatus and surroundings of the pressure equalization apparatus. The connection device comprises a spring element, the spring force of which acts in particular in a direction extending crosswise to an opening direction of the pressure equalization apparatus.

An explosion-proof venting valve for a battery pack includes a protective cover, a cover seat engaged with the protective cover, and a membrane being water-impermeable and gas-permeable, the membrane being disposed under the protective cover. The explosion-proof venting valve further includes a valve body configured to be connected with a housing of the battery pack, a self-locking mechanism disposed on the cover seat, the protective cover, the cover seat, the membrane and the self-locking mechanism forming a cover assembly defining a venting passage, and a filter element housed in the valve body, the filter element and the valve body defining a valve passage.

A pressure relief assembly has a frame having a coupling structure, a valve mounting surface, a valve opening within the valve mounting surface, a vent mounting surface, and a vent opening within the vent mounting surface. The vent opening is functionally parallel to the valve opening. A valve body is sealably disposed on the valve mounting surface across the valve opening. A first detent releasably secures the valve body to the frame. The first detent is configured to release the valve body from the frame upon a minimum pressure differential across the valve opening. A vent is coupled to the vent mounting surface across the vent opening.

A battery housing includes a valve device for pressure equalization and for letting out a hot gas of a battery cell. The valve device has a valve seat in the form of a gas release opening in a housing wall of the battery housing and a valve body. The valve body closes the gas release opening when in a closed position, can be moved by a pressure-difference-induced internal pressure increase into a first open position in which the valve body reversibly opens the gas release opening to provide pressure equalization, and can be moved by a hot-gas-induced internal pressure increase into a second open position in which the valve body irreversibly opens the gas release opening to let out the hot gas.