The disclosure relates to a pressure release valve (100). The pressure release valve may be suitable for use as an oil recovery valve. In one embodiment, the pressure release valve may comprise a piston (5) and tube (4) configured to slide within a valve body, wherein the piston is configured to remain sealingly engaged with the tube until the pressure release valve fully activates. Upon activation, the piston may disengage from the tube, thereby allowing fluid to escape from the valve through the tube.

A hydrant includes a hydrant body defining an internal cavity; an upper stem positioned within the internal cavity; a lower stem positioned within the internal cavity; and a stem coupling securing the upper stem to the lower stem, the stem coupling comprising a coupling body defining a main bore that is circular in radial cross-section and sized to receive the upper stem and the lower stem; and a plurality of ribs, each rib extending radially outward from the coupling body.

A breaker clamp member includes a curved body shaped to fit around a portion of an upper portion of a fire hydrant and a portion of a lower portion of the fire hydrant at a joint between the upper portion of the fire hydrant and the lower portion of the fire hydrant. The breaker clamp member also includes at least one connection element extending from the body to connect the breaker clamp member with at least one other breaker clamp member. The breaker clamp member also includes an upper rim protruding from the body and a lower rim protruding from the body. The upper protruding rim, the lower protruding rim, and the body define a concavity therebetween, the concavity being configured to receive the first ledge and the second ledge. In another embodiment, a breaker clamp includes two breaker clamp members.

A fault-accommodating flow scheduling valve has a first inlet, outlet, and orifice therebetween. The valve has a shuttle valve member on the orifice inlet side, a primary valve member on the orifice outlet side, a compression-loaded primary spring, and first and second compression-loaded balance springs. Below a threshold differential pressure, the primary valve member engages with the outlet-side sealing face to close the valve while the shuttle valve member is spaced from the inlet-side sealing face, and on failure of the primary spring, the primary valve member moves from the outlet-side sealing face but the shuttle valve member closes the valve. Above the threshold differential pressure, the primary valve member opens the valve while the shuttle valve member remains spaced, and on failure of the primary spring, the primary valve member moves further from the outlet-side sealing face but the shuttle valve member closes the valve.

A valve arrangement comprises a rotatable part 32 rotatable relative to a stationary part 12, wherein one of the rotatable part 32 and the stationary part 12 includes an abutment surface 36a, 36b engageable with a stop associated with the other of the rotatable part 32 and the stationary part 12, wherein the stop comprises a stop pin 40 of hollow, substantially cylindrical form.

A pressurization device for pressurizing an enclosure may include a container containing a pressurized fluid, a pin that is inserted into the container, an actuator, and a heating device operably coupled to the actuator. The actuator may initially hold the pin in a closed position and allow the pin to move to an open position, disengaging from the container when the actuator increases in temperature. The pressurized fluid may force the pin toward the open position to release the pressurized fluid from the container. The actuator may include a frangible hollow bulb configured to fracture at a pre-defined temperature. The pressurized fluid may be vented into the enclosure through at least one fluid passage in fluid communication between the enclosure and the container.

A pressurization device for pressurizing an enclosure may include a container containing a pressurized fluid, a pin that is inserted into the container, an actuator, and a heating device operably coupled to the actuator. The actuator may initially hold the pin in a closed position and allow the pin to move to an open position, disengaging from the container when the actuator increases in temperature. The pressurized fluid may force the pin toward the open position to release the pressurized fluid from the container. The actuator may include a frangible hollow bulb configured to fracture at a pre-defined temperature. The pressurized fluid may be vented into the enclosure through at least one fluid passage in fluid communication between the enclosure and the container.

A pressure relief device is disclosed. The pressure relief device may take the form of a butterfly vent, including paired burst panels or blow-out portions that are configured to open in a manner similar to a butterfly flapping its wings. Upon opening, the paired burst panels may contact each other, thereby absorbing kinetic energy. The burst panels may be positioned within a frame or may be formed or cut from a single sheet. A cord may be provided between the burst panels to retain the burst panels and/or ensure that the burst panels open substantially simultaneously. The pressure relief device also may include an activation mechanism to control the opening of the burst panels, one or more hinge members, and/or a braking member.

A hydrant includes a hydrant body defining an internal cavity; an upper stem positioned within the internal cavity; a lower stem positioned within the internal cavity; and a stem coupling securing the upper stem to the lower stem, the stem coupling comprising a coupling body defining a main bore that is circular in radial cross-section and sized to receive the upper stem and the lower stem; and a plurality of ribs, each rib extending radially outward from the coupling body.

A pressure relief valve including a housing having an inlet and a relief outlet connected by a fluid flow passageway, the inlet fluidly connectable to a work string. The pressure relief valve includes a head sealingly disposed within the passageway between the inlet and relief outlet closing the fluid flow passageway between the inlet and relief outlet. An elongate buckling rod supports the head and is bucklable at a predetermined load thereby permitting sliding of the head from between the inlet and a relief outlet and opening the fluid flow passageway. A projection within the housing is extendible to an extended configuration, wherein in the extended configuration the projection applies a lateral force perpendicular to the longitudinal direction of the buckling rod bending the rod from its axial center thereby decreasing the load at which the buckling rod collapses.