A pressure equalization device for a housing has a base body and a closure element with a flow path between them being open in a normal operating state of the pressure equalization device. A flow opening in the flow path is spanned by a membrane. An emergency venting spike projects from the closure element toward the membrane. The pressure equalization device transitions after emergency venting into an emergency operating state in which the closure element gas-tightly closes the base body. A housing with such a pressure equalization device is provided. In a method for pressure equalization with such a pressure equalization device between a housing interior and an environment, gas exchange between interior and environment is performed through the membrane and the flow path between closure element and base body. During emergency venting, the membrane is destroyed by the emergency venting spike. The closure element then closes the base body.

A valve arrangement for inflating an inflatable device includes a valve body comprising an inlet, an outlet, a main fluid channel, a first ball detent, and a second ball detent. A lifter and a sleeve are located in the main fluid channel. A locking ball is disposed at least partially within a locking ball aperture disposed in the sleeve. A piston is coupled to the lifter and fluidly coupled to a command pressure cavity of the valve body. A spring biases the lifter toward a ball locking position whereby the lifter urges the locking ball at least partially into the first ball detent. A valve operation initiator controls a flow of pressurized gas into the command pressure cavity to urge the lifter to a ball releasing position to free the sleeve, as to the locking ball, to translate to an open position to fluidly couple the inlet with the outlet.

A valve arrangement for inflating an inflatable device includes a valve body comprising an inlet, an outlet, a main fluid channel, a first ball detent, and a second ball detent. A lifter and a sleeve are located in the main fluid channel. A locking ball is disposed at least partially within a locking ball aperture disposed in the sleeve. A piston is coupled to the lifter and fluidly coupled to a command pressure cavity of the valve body. A spring biases the lifter toward a ball locking position whereby the lifter urges the locking ball at least partially into the first ball detent. A valve operation initiator controls a flow of pressurized gas into the command pressure cavity to urge the lifter to a ball releasing position to free the sleeve, as to the locking ball, to translate to an open position to fluidly couple the inlet with the outlet.

The present disclosure provides a valve seat assembly for a fluid end of a hydraulic fracturing pump. The valve seat assembly includes a valve seat having a substantially cylindrical body defined along an axis. The valve seat has a first seat end and a second seat end with a through bore extending between the first and second seat ends. The cylindrical body has an inner cylinder surface and an exterior cylinder surface with an annular flange formed along the exterior cylinder surface adjacent the first seat end. The through bore expands from a first diameter to a second diameter adjacent the first seat end. The valve seat assembly further includes a leak detection notch formed in the exterior cylinder surface between the annular flange and the second seat end.

A safety relief valve for a high-pressure hydrogen cylinder is provided therein with a compression spring and an adjusting nut. The adjusting nut can move up and down to adjust the pressure of the compression spring to compress a sealing plug, so as to adjust the pressure in the hydrogen cylinder to reach an upper limit of pressure relief, which is convenient. Meanwhile, the safety relief valve is provided therein with a fusible seal. When the temperature is lower than a melting point, the fusible seal solidifies, and the sealing plug keeps a gas outlet sealed to prevent hydrogen leakage. When the temperature is higher than the melting point, the fusible seal melts. When the pressure in the hydrogen cylinder is higher than the set upper limit, the sealing plug is forced to open, and the hydrogen flows from an exhaust hole to a hydrogen collection tube.

A valve member for an inlet or outlet valve assembly of a reciprocating pump assembly includes a valve body and a seal member. The valve body comprises a first body surface and a second body surface that extend circumferentially about the valve body. The valve body defines a body axis and an annular cavity. The seal member is positioned at least partially within the annular cavity of the valve body such that an outer seal portion of the seal member extends between the first body surface and the second body surface of the valve body. The outer seal portion of the seal member comprises a first seal surface and a second seal surface. The first body surface, the first seal surface, and the second seal surface extend at different angles relative to the body axis.

A safety relief valve for a high-pressure hydrogen cylinder is provided therein with a compression spring and an adjusting nut. The adjusting nut can move up and down to adjust the pressure of the compression spring to compress a sealing plug, so as to adjust the pressure in the hydrogen cylinder to reach an upper limit of pressure relief, which is convenient. Meanwhile, the safety relief valve is provided therein with a fusible seal. When the temperature is lower than a melting point, the fusible seal solidifies, and the sealing plug keeps a gas outlet sealed to prevent hydrogen leakage. When the temperature is higher than the melting point, the fusible seal melts. When the pressure in the hydrogen cylinder is higher than the set upper limit, the sealing plug is forced to open, and the hydrogen flows from an exhaust hole to a hydrogen collection tube.

A membrane puncturing mechanism comprises a first element and a second element arranged with opposing surfaces. At least one opposing surface comprises a sloping region inclined relative to the other opposing surface. The first element is moveable towards and away from the second element. A pin for puncturing a membrane is coupled to the first element such that movement of one of the pin and first element causes movement of both. A spring is operable to bias the first element towards the second element. An actuator is removably positioned between the opposing surfaces, the actuator being withdrawable from between and moveable along the opposing surfaces such that, as the actuator is withdrawn, the actuator progressively moves the first and second elements apart against the bias of the spring so as to load the spring and such that the actuator being fully withdrawn from between the opposing surfaces.

A valve assembly is provided, the valve assembly comprising a body that defines a fluid flow path between an inlet and an outlet with a frangible member between the inlet and the outlet across the fluid flow path so as to block fluid flow The valve assembly also includes a member for rupturing the frangible member, a spring biasing the rupturing member into contact with the frangible member and a member for retaining the rupturing member away from the frangible member. A magnet is spaced apart from the retaining member, and a non-magnetic sleeve is disposed between the magnet and the retaining member. The non-magnetic sleeve blocks a magnetic field provided by the magnet. Also included is a trigger for removing the non-magnetic sleeve, wherein, when the non-magnetic sleeve is removed, in use, the magnetic field attracts the retaining member to release the rupturing member to cause rupture of the frangible member.

A valve includes a valve body having a gas inlet and a gas outlet. The valve body has an internal circumferential wall defining a gas passageway between the gas inlet and gas outlet. The inlet of the valve body is connectable to a source of pressurized gas. The valve also includes a rupture disc provided adjacent said gas inlet, wherein the ruptured disc is configured to prevent flow of gas through said inlet when intact and to allow flow of gas through said inlet when ruptured. The valve includes ribs radially extending from the internal circumferential wall, said ribs extending longitudinally in the direction to the gas outlet and from the gas inlet in a maze-type pattern. The ribs may be formed in a printed pattern to form a maze with dead-ends.