A valve assembly for a dispenser. The valve assembly includes a valve body that extends about a longitudinal axis and defines an outer surface and an inner passageway. A valve stem extends through the inner passageway and includes an outer stem surface, an inner stem surface opposite the outer stem surface, and a first orifice extending from the outer stem surface to the inner stem surface. The valve assembly includes a retaining member joined to the valve stem, wherein the retaining member extends outward from the outer stem surface. The valve assembly includes a resilient member and one or more force concentrators configured to operatively engage the resilient member.

The present invention comprises a unibody check valve for detachable use with a submersible pump, said check valve comprising a unibody housing with an inlet and an outlet defining a fluid passage, where a portion of the face of the outlet comprises a poppet seat, and a poppet stem enclosing member held in axial alignment with the fluid passage by one or more supporting members, a poppet slidably retained within said poppet stem enclosing member, and a biasing member captured between the one or more supporting members and a poppet stem base, where the biasing member biases the poppet head into a closed position against the seat when liquid flow is not sufficient to overcome the force of the biasing member, and where the poppet head is pushed away from the seat when liquid flow is sufficient to overcome the force of the biasing member.

A valve device includes: an opening and closing section capable of being switched between an open state and a closed state, and a drive section having a rectilinearly moving mechanism configured to move a rectilinearly movable member in forward and backward directions; a transmission section configured to bring the opening and closing section to the closed state when the rectilinearly movable member is moved forward and to bring the opening and closing section to the open state when the rectilinearly movable member is moved backward; and a switching section capable of being switched between a connected state in which the movement of the rectilinearly movable member in the forward and backward directions is able to be transmitted to the transmission section and a disconnected state in which the movement of the rectilinearly movable member in the forward and backward directions is unable to be transmitted to the transmission section.

A self-sealing safety valve (10) for a container of pressurised fluid (12) comprises a substantially solid body (14) and attachment means (24) for connecting to a dispensing valve. The self-sealing safety valve includes a substantially central bore (16) extending through both the attachment means and the solid body, and the bore connects an inlet (20) to an outlet (18). The bore comprises at least three parts each of a different diameter: a first part (16a) immediately adjacent the outlet has a first diameter; a second part (16b) located immediately adjacent the first part has a second diameter that is wider diameter than the first diameter; and a third (16c) part located immediately adjacent the second part has a third diameter that is wider than the second diameter. The second part of the bore houses a first biasing means (30). The third part of the bore houses a sealing ball (28) and a second biasing means (38), and the sealing ball is located between the first and second biasing means. The diameter of the sealing ball is greater than the first diameter but smaller than the second diameter and is capable of sealing the second part of the bore. Under normal flow conditions of fluid through the bore, the first biasing means is configured to bias the sealing ball away from the second part of the bore. Under conditions of high pressure fluid flow through the bore, the sealing ball is forced towards a junction (21) between the second and third parts of the bore, against the first biasing means, sealing the outlet.

A pressure evacuation device for a compressed gas cylinder having a fixed assembly that is semi-permanently attached to an opening in the cylinder and comprises a retractable bleed valve, and a detachable assembly that can he readily attached to and detached from the fixed assembly and comprises a valve stem to control the bleed valve and a valve tee to direct the flow of gas from the cylinder.

The invention relates to shut-off valve for controlling flow of a pressurised gas. The shut-off valve comprising a body defining a passage extending between a gas inlet channel and a gas outlet channel, a sealing element, and an emergency stop mechanism. The sealing element arranged to, in a first position, close the passage, and in a second position, open the passage to allow gas to flow between the gas inlet channel and the gas outlet channel through the passage. The invention also relates to a method for controlling flow of a pressurised gas with a shut-off valve and a method for activating an emergency stop of a shut-off valve.

The invention is directed to a valve for a compressed gas cylinder, comprising: a valve body with an inlet, an outlet and a passage connecting the inlet with the outlet; a shut-off device of the passage with an actuating pin extending in the passage; a check-valve between the shut-off device and the inlet, the check valve comprising a seat and a movable closing member initially held at a position distant from the seat by contact with a guiding surface and movable past the position by the pin so as to cooperate with the seat and prevent a refilling flow of gas from the outlet to the inlet. The guiding surface is on a tubular portion fixed to the valve body and comprising at least one radial aperture so as to allow the refilling flow of gas to by-pass the closing member when in the distant position.

A gas shut-off valve assembly designed to automatically close gas flow in a gas conduit in response to a seismic vibration comprises a door which may be parallel to a port in the conduit and a weight above the door. In some embodiments, the door may be mostly out of the conduit passageway and out of the gas flow allowing for improved gas flow efficiency in the normally open state. Upon sensing a seismic vibration, the weight falls from a platform onto the door causing the door to move into the conduit passageway sealing the passageway. In some embodiments, a port in the passageway is perpendicular to the door's default position in the open state. When the door closes the passageway, the door rotates ninety degrees about an axis into the second closed position to become parallel with the port.

The invention is directed to a valve actuating device comprising a body with a bore and a bottom, an actuating element sealingly housed in the bore of the body and forming a first chamber with the body, a piston sealingly extending through a bore in the actuating element, the piston and bore delimiting a second actuating chamber, a passage for an auxiliary fluid between the first and second chambers so that a movement of the piston in the bore of the actuating member can increase the pressure in the first chamber and move the actuating element. The fluid passage comprises a restriction and a check-valve, both arranged in parallel, so as to limit the flow of the auxiliary fluid from the second chamber to the first chamber.

An operating structure of an exhaust heat recovery device may include a bypass valve rotatable about a rotation shaft to open and close a bypass passage; a heat exchanger communicating with the bypass passage, a valve actuator inserted into the heat exchanger, and having a piston moved upward and downward depending on a temperature of coolant; a guide unit in which an end of the piston is slidably inserted, and at which an end of a rod is slidably inserted; a displacement transmission medium accommodated in the guide unit, and moved along with the piston; a link unit rotatably connected to the bypass valve and the rod, and converting sliding motion of the rod into rotation of the bypass valve; and an elastic restoring unit operating the rod so that the rod is inserted into the guide unit, or operating the bypass valve so that the bypass valve is closed.