A temperature pressure relief device includes a body including an inlet passage into which high-pressure gas is introduced, an interior passage extending from the inlet passage in a predetermined first direction, and a high-pressure gas exhaust passage that is formed between the inlet passage and a reference end that is a distal end of the interior passage in the first direction and that connects the interior passage to an outside, a blocking part disposed in the interior passage of the body and selectively placed in one of a blocking state or a connecting state, and a support part arranged between the blocking part and the reference end, in which the support part is maintained in a solid state at a reference temperature or less and is in a molten state at more than the reference temperature and discharged from the interior passage.

A safety interlock valve with two flow passages, which in one position allows flow through the flow passages and blocks flow between them, and in another position blocks flow through the flow passages and allows flow between them. The safety interlock valve can be used in hydraulic systems such as power tongs.

A hydraulic circuit for a hybrid powertrain having an engine and an electric motor. The hydraulic control circuit includes a first pressure regulating valve configured to cooperate with a shift valve for selectively communicating a hydraulic fluid to a hydraulic piston actuator of a clutch assembly for engaging the engine to a driveline. The hydraulic control circuit further includes a second pressure regulating valve configured to selectively communicate a flow of hydraulic fluid to a cooling circuit for the cooling of the electric motor and to cooperate with a check valve and the shift valve to actuate the hydraulic piston actuator during a predetermined fail mode of the first pressure regulating valve, thus providing a limp-home mode by coupling the torque output from the engine to driveline of the vehicle.

A fluid coupler includes: an outer body; an end connector being at least partially received inside the outer body and configured to receive pressurized fluid; an inner body received inside the outer body, the inner body being moveable with respect to the outer body; a seat holder and a valve seat both located inside of the inner body, the valve seat being configured to press against an inner surface of the inner body to close the fluid coupler; a connector partially housed within the inner body, the connector comprising a first end secured to the seat holder and a second end. The fluid coupler defines a pressurized fluid flow path enabling pressurized fluid to contact and pressurize the end connector, the inner body, the seat holder, and the connector without contacting and pressurizing the outer body.

A fluid coupler includes: an outer body; an end connector being at least partially received inside the outer body and configured to receive pressurized fluid; an inner body received inside the outer body, the inner body being moveable with respect to the outer body; a seat holder and a valve seat both located inside of the inner body, the valve seat being configured to press against an inner surface of the inner body to close the fluid coupler; a connector partially housed within the inner body, the connector comprising a first end secured to the seat holder and a second end. The fluid coupler defines a pressurized fluid flow path enabling pressurized fluid to contact and pressurize the end connector, the inner body, the seat holder, and the connector without contacting and pressurizing the outer body.

Described herein is a safety valve for a hydraulic circuit comprising a pump designed to supply a hydraulic fluid at a first pressure value to a pressure line, comprising: a chamber, which can be fluidically connected to the pressure line and is filled with the hydraulic fluid at a pressure value and a temperature value; and a casing with an opening, which can be connected to a reservoir of the hydraulic circuit; a shutter, which delimits the first chamber and can be displaced between a first position, in which it occludes the first opening, and a second position, in which it leaves the opening at least in part free; the valve comprises a thermally expandable element, which can be displaced, as a result of the temperature of the hydraulic fluid, between a first configuration that it assumes when the temperature of the hydraulic fluid is below the threshold value and a second configuration that it assumes when the temperature of the hydraulic fluid is above the temperature threshold value and in which it holds or displaces the first shutter in or towards the second position so as to reduce the pressure in the first chamber.

Described herein is a safety valve for a hydraulic circuit comprising a pump designed to supply a hydraulic fluid at a first pressure value to a pressure line, comprising: a chamber, which can be fluidically connected to the pressure line and is filled with the hydraulic fluid at a pressure value and a temperature value; and a casing with an opening, which can be connected to a reservoir of the hydraulic circuit; a shutter, which delimits the first chamber and can be displaced between a first position, in which it occludes the first opening, and a second position, in which it leaves the opening at least in part free; the valve comprises a thermally expandable element, which can be displaced, as a result of the temperature of the hydraulic fluid, between a first configuration that it assumes when the temperature of the hydraulic fluid is below the threshold value and a second configuration that it assumes when the temperature of the hydraulic fluid is above the temperature threshold value and in which it holds or displaces the first shutter in or towards the second position so as to reduce the pressure in the first chamber.

A control circuit for automatically stopping the flow of a gas in a primary circuit, includes a valve, a sensor and a controller. The valve is couplable with a primary pressure-regulator that controls the flow of another gas in a primary circuit. The valve has an inlet operable to receive a gas and an outlet operable to distribute the gas. The sensor is positionable in the primary circuit and operable to sense a parameter of the flow of the gas in the primary circuit and generate a signal that represents the sensed parameter. The controller is operable to receive the sensor's signal and, in response to the signal, direct the valve to close if the parameter of the flow of gas in the primary circuit lies outside of a predetermined range.

A control circuit for automatically stopping the flow of a gas in a primary circuit, includes a valve, a sensor and a controller. The valve is couplable with a primary pressure-regulator that controls the flow of another gas in a primary circuit. The valve has an inlet operable to receive a gas and an outlet operable to distribute the gas. The sensor is positionable in the primary circuit and operable to sense a parameter of the flow of the gas in the primary circuit and generate a signal that represents the sensed parameter. The controller is operable to receive the sensor's signal and, in response to the signal, direct the valve to close if the parameter of the flow of gas in the primary circuit lies outside of a predetermined range.

A packing system is disclosed for use with a valve having a bonnet and a flow passage extending between an inlet and an outlet of a valve body. A bore can extend through the bonnet to receive a stem that moves a control member to control flow through the flow passage. A first packing arrangement can be arranged in the bore about a first portion of the stem. A second packing arrangement can be arranged in the bore about a second portion of the stem with the first packing arrangement between the second packing arrangement and the valve body. A bore port can extend through the bonnet and open into an inter-packing volume of the bore between the first and second packing arrangements and can provide fluid communication between the inter-packing volume and the outlet of the valve or other lower pressure area.