A valve arrangement for a switching valve and to a switching valve for regulating a mass flow in a refrigerating circuit or a heating circuit, including a valve housing, which includes a feed opening and a discharge opening, including a valve piston, which includes a valve-closing member, which buts against a through-hole between the feed opening and the discharge opening in a closed position on a valve seat and closes the through-hole, wherein the valve seat includes a stop surface and a sealing surface which are oriented so as to be adjacent to one another, the valve-closing member includes a supporting surface and a gasket surface which are oriented so as to be adjacent to one another, an elastic sealing element is provided on the valve seat or the valve-closing member, on which sealing element the sealing surface or gasket surface is formed, a sealing projection is provided on the sealing surface or the gasket surface and is oriented towards the opposite gasket surface or sealing surface, the supporting surface of the valve-closing member and the stop surface of the valve seat but against one another in the closed position and form a travel limitation between the valve-closing member and the valve seat, and the sealing projection is at least partially pressed into the sealing element.

A fuel system having a fuel tank, a filler pipe for adding liquid fuel, a carbon canister for collecting fuel vapors from the fuel tank during a refueling operation, a stepper motor and a stepper driven valve for controlling fluid communication between the fuel tank and the canister, where the valve is configured to be positionable in a closed position, an open position creating a passageway with a first size, and one or more intermediate positions each creating a passageway with a size which is smaller than the first size and having a moving element, movable relative to a valve opening between a closed position and an opened position, the moving element having: a sealing means for making a leak tight seal and, a deflecting means for controlling the fluid flow, where the deflecting means protrudes inside the valve opening and is adapted to be located upstream relative to sealing means.

A check valve includes a valve element and a valve body having a body housing, an annular valve seat insert, a bushing, and a biasing member. The body housing includes an outer circumferential wall extending between an inlet port and an outlet port to define a valve cavity therebetween. The valve seat insert is seated in a body seat surface surrounding the inlet port. The bushing is disposed in the valve cavity and defines a central bore, with the bushing including an outboard end surface axially engageable with the valve seat insert. The biasing member is disposed between a bearing portion of the body housing and an inboard end of the bushing to allow for axial movement of the bushing with respect to the body seat surface. The valve element extends through the bushing central bore and is movable between a closed position and an open position.

A valve for pressurized fluid having a body housing a fluid circuit having an upstream end configured to be placed in communication with a reserve of pressurized fluid and a downstream end configured to be placed in communication with a user of fluid, the circuit having a collection of valve shutter(s) having at least one shutoff valve shutter allowing the circuit to be closed or opened, the valve having a member for manually controlling the collection of valve shutter(s), the control member being mounted to allow the body to move between a rest position in which the collection of valve shutter(s) is in a position in which the circuit is closed and an active position in which the control member actuates the collection of valve shutter(s) into a position in which the circuit is open with a first bore section

Staying of a drain on a cylinder attached to a lower side of a valve casing is suppressed, and occurrence of corrosion of the cylinder is suppressed. A steam valve includes a valve casing, a valve disc disposed within the valve casing, a cylinder disposed on a lower side of the valve casing and having a piston rod extending upward, a valve stem vertically penetrating a lower portion of the valve casing and having one end coupled to the piston rod via a coupling and having another end coupled to the valve disc, a cover having a larger diameter than the piston rod and the coupling and configured to separate the piston rod and the coupling from each other by being interposed between the piston rod and the coupling, and a tubular skirt hanging down from a peripheral portion of the cover and surrounding a periphery of a head portion of the piston rod.

An example valve includes a valve body having a first port and a second port; a poppet movable within the valve body and comprising (i) a conical surface, (ii) an exterior cylindrical surface, and (iii) an annular groove; and a seal disposed in the annular groove of the poppet, wherein the poppet is movable to a partially-unseated position in which the poppet moves to form a flow area allowing fluid flow from the first port to the second port, wherein the exterior cylindrical surface of the poppet forms a flow restriction with the interior surface of the valve body downstream from the flow area, wherein the conical surface is configured to direct fluid toward the interior surface of the valve body, away from the seal, and wherein the flow restriction generates back-pressure around the seal to reduce velocity of fluid around the seal.

Valve trim apparatus having multiple fluid flow control members are disclosed herein. An example valve trim apparatus includes a primary valve seat and a first flow control member having a cavity and a first seating surface. The first flow control member is movable relative to the primary valve seat to control fluid flow between an inlet and an outlet of the fluid valve. A second flow control member is disposed within the cavity. The second flow control member is slidably coupled relative to the first flow control member. A secondary valve seat is coupled to the first flow control member. The second flow control member is to move relative to the secondary valve seat to throttle a fluid flow across the secondary valve seat.

A vent valve for a buoyancy control device (“BCD”) suitable for divers, where the valve may be opened by any combination of over-pressure, manual pressure relief or a powered means, where a force to a valve plug is applied by means of a spring that is constrained to prevent entirely lateral and angular movement but in which movement of the plug in the axis of the seat is unconstrained. An automatic buoyancy control device suitable for free-swimming divers, providing the functions that may include a controlled ascent rate, controlled descent rates, the imposition of a maximum depth limit, the facility to hold a set depth and to follow a dive profile or decompression profile. The device, control process and subsystems provide a high safe failure fraction.

Technologies are described for diaphragm valves with plastic diaphragm and reduced or no elastomer backing cushion, where peripheral or all sealing forces may be applied directly to the diaphragm of the valve assembly. In various examples, the valve assemblies may include a pressure ring to apply sealing force to a surface of the diaphragm with a reduced size or no backing cushion allowing a two-fold or more increase in pressure capacity of the valve assembly. In other examples, an elastomer or metallic spring placed above a center diaphragm boss may provide center-to-edge compliance for passage seal.

A fuel tank isolation valve for a vehicle includes a drive unit having a solenoid coil; a flow path unit having a vaporized fuel gas flow path; a valve assembly configured to open or close the flow path in the flow path unit by being operated by the drive unit, where the valve assembly includes: a first valve configured to open the flow path by being operated by a magnetic force generated by the coil; and a second valve configured to open the flow path while operating in conjunction with the first valve by being caught by the first valve when the first valve operates. The first valve and the second valve may operate in conjunction with each other by being mechanically caught, such that it is not necessary to provide a separate spring for operating the second valve.