A flow control valve sub including a tubular valve sub housing having a sub central passage and a valve cavity formed in a sidewall of the sub housing. At least one piston aperture and at least one constant area pilot aperture communicate between the valve cavity and the sub central passage, while a piston is positioned in the piston aperture with the piston moving to at least partially cover and uncover the flow port in order to create a variable flow path between the valve cavity and the sub central passage. A beam spring is supported at a location within the cavity on each side of the piston and biases the piston toward a less flow restrictive position relative to the flow port and a valve cover is positioned to substantially close the valve cavity.

A valve configured to selectively communicate fluid pressure therethrough includes a valve body having an inlet, an inlet bore extending inwardly of the body from the inlet, a reduced diameter bore, a cam bore, and an outlet bore therein, the outlet bore in fluid communication with the cam bore, and the cam bore including a sloped wall therein extending inwardly on the cam bore in the direction away from the inlet bore, a first piston disposed in the a reduced diameter bore and including a piston passage therethrough fluidly communicating between the inlet bore and the cam bore, a cam disposed in the cam bore and having a self-energizing seal and a lower angled surface engagable against the sloped wall, the self-energizing seal disposed in a seal piston bore therein, and an outlet extending to the exterior of the valve body and opening into the lower angled surface.

The present invention concerns a fluid stop valve unit comprising at least one fluid stop valve and a pressure responsive part, integrated or separate, arranged so that the at least one fluid stop valve is kept in a closed state. The pressure responsive part, integrated or separate, has an opening characteristic going from the closed state to an open state with a decrease of pressure after a threshold pressure has been reached.

A sealing assembly for controlling a flow of fluid through a fluid line has a housing having a first end opposite a second end with a hollow interior extending therebetween and an elastically resilient plug disposed within the hollow interior of the housing. The plug has a body engagable with a seat within the housing and a tension member having a first end connected to the body and a second end connected to the housing. The tension member is pre-loaded in tension to urge the body of the plug against the seat to seal the hollow interior of the housing. The body is movable away from the seat when the plug is acted upon by a fluid pressure greater than a pre-load force of the tension member.

The valve for pressure compensation and/or for emergency venting of a container, preferably of a housing of a vehicle battery, has a housing (6) with an inlet (6a) that is closable by at least one valve element (23) subjected to a closing force in a first position. The housing (6) is at least partially gas-permeable and preferably water-tight, and has at least one outlet (26) which is located behind the valve element (23) when the valve element (23) assumes its first position. So that in case of a malfunction even larger quantities of gas can be guided to the exterior through the valve, is the valve element for an increased pressure surpassing the closing force at the inlet (6a) is adjustable in the direction toward a second position against the closing force, in which the valve element (23) at least partially opens the outlet (26) such that the outlet (26) is directly connected in flow communication with the inlet (6a).

A vehicular washing device includes: a nozzle (4); a flow passage forming body (2) of which an internal space is a flow passage of a fluid; and a valve (21) that has a pressing tube part (22) with an axial direction coinciding with a flow direction of the fluid, is elastically deformable in a direction in which the diameter of the pressing tube part changes, and opens and closes the flow passage according to the state of deformation. A first flow passage (2a) and a second flow passage (2b) are formed as the flow passage on opposite sides of the pressing tube part. A shaft (9) with which the pressing tube part is capable of coming into close contact is located inside the valve. The valve deforms elastically according to the magnitude of the pressure of the first flow passage or the pressure of the second flow passage relative to an atmospheric pressure.

A valve includes a deformable portion connected to a rigid portion. A portion of a surface of a frustoconical body of the rigid portion is disposed adjacent a portion of a surface of a frustoconical body of the deformable portion. A portion of a surface of an upper axially-extending portion of the rigid portion is disposed adjacent a portion of a surface of an upper axially-extending portion of the deformable portion. A portion of the surface of the frustoconical body of the deformable portion that is not disposed adjacent a portion of the surface of the frustoconical body of the rigid portion defines a circumferential void. The circumferential void is in fluid communication with a plurality of upstream radial bypass passages extending through the frustoconical body of the rigid portion.

A pressure relief valve may include a housing and a seat portion in flow communication with an inlet passage. The pressure relief valve may also include a relief body configured to abut the seat portion and provide a fluid seal between the inlet passage and an outlet passage, and a keeper abutting the relief body. The pressure relief valve may also include an intermediate sleeve coupled to the housing and at least one waveform spring configured to abut the keeper and resist movement of the relief body and the keeper away from the seat portion, such that the relief body prevents flow communication between the inlet passage and the outlet passage. The pressure relief valve may further include an end cap including a shoulder abutting the end surface of the intermediate sleeve and a reaction surface against which an end of the at least one waveform spring abuts.

An overpressure protective device for passively blocking flow of gas at a selected pressure setpoint includes a valve, a valve stem, and vacuum-filled bellows coupled to the valve stem. The vacuum-filled bellows are configured such that expansion and/or contraction of the bellows as a result of pressure changes present at the valve are harnessed to passively move the valve stem to operate the valve and block pressures higher than a preconfigured pressure setpoint. If the process pressure drops below the pressure setpoint, the overpressure protective device operates the valve to again permit flow of pressurized gas through the valve.

A damping valve for a vibration damper includes a damping valve body having at least one through-channel which is at least partially covered by at least one valve disc, wherein the valve disc is preloaded onto a valve seat surface by a flat spring, wherein a contact region of the spring has an elastomer coating.