A stopcock controls the flow of a liquid under pressure through a dispensing tube with an upstream portion separated by the stopcock from a downstream portion. The stopcock includes a housing portion with a chamber defined by a housing peripheral wall surrounding a longitudinal z-axis. The housing peripheral wall has an inner surface of revolution with a housing inlet opening connectable to the upstream portion of the dispensing tube. The stopcock includes an outlet connector connectable to the downstream portion of the dispensing tube and comprising an outlet opening. A plug defined by a plug outer peripheral wall snugly fitting the inner surface of revolution of the housing peripheral wall. The plug can rotate within the chamber about the longitudinal z-axis. The plug has a through-channel extending from an upstream opening located on the plug outer peripheral wall, to a downstream opening, such that the plug can be rotated about the longitudinal z-axis from a flow position to a sealed position, wherein, the plug outer peripheral wall comprises a seal protrusion topped by a ridge and forming a closed loop defining a blank area of the plug outer peripheral wall, such that, in the sealed position, the housing inlet opening of the housing peripheral wall faces the blank area and is circumscribed within the seal protrusion. The plug outer peripheral wall has a flow protrusion topped by a ridge circumscribing the upstream opening such that, in the flow position, the inlet opening of the cylindrical chamber peripheral wall is circumscribed by the flow protrusion, wherein said flow protrusion preferably shares a common portion of protrusion with the seal protrusion.

A valve includes a housing having a housing cavity and at least two housing openings. A valve body is rotatably provided in the housing cavity and includes a valve body top portion, a valve body bottom portion and a valve body sidewall. The valve body sidewall has an upper valve body sidewall and a lower valve body sidewall which are connected to each other. An outer surface of the upper valve body sidewall is a partial cylindrical surface, and an outer surface of the lower valve body sidewall is shaped to have a gradually decreasing diameter in a direction from top to bottom. A seal is provided on the valve body sidewall and the seal is configured to match with the housing to enable the valve body sidewall to close at least one of the housing openings.

A hydraulic end assembly structure of a plunger pump, comprising a valve housing assembly, a suction gland and a suction pressing cap. The suction gland is connected to the suction pressing cap, and the suction gland is connected to the valve housing assembly through the suction packing seal assembly.

The present invention relates to a multiway valve for controlling at least one flow of at least one fluid, in particular within a motor vehicle, including at least one housing and one valve member disposed at least in areas within at least one valve space which is configured at least in areas within the housing, and by way of changing a rotary position of the valve member within the valve space about a first rotary axis, at least the amount of an inflow of the fluid from at least one first fluid connector into the valve space and/or at least the amount of outflow of the fluid out of the valve space is adjustable by at least one second fluid connector, and the multiway valve includes at least one insert which is disposed at least in areas between the valve member and the housing and is connected in a rotationally fixed manner to the housing.

An angle valve structure includes an angle valve body. The angle valve body is provided with a water inlet channel, a water outlet channel and an accommodation cavity. The accommodation cavity is rotationally provided with a valve core. One end of the valve core exposed outside the accommodation cavity is fixedly connected with a knob. The valve core is provided with a sealing block for sealing the water outlet channel when sealing. The valve core includes a main body part and an elastic arm whose one end is connected with the main body part. One side of the main body part is provided with a mounting slot for placing the sealing block, one side of the elastic arm is provided with an extrusion portion, and the other side of the elastic arm is provided with a contact portion against the sealing block after assembly.

A two-component rotary valve for controlling the fluid flow through a fluid conduit, the rotary valve being injection-moulded in two steps with no need for assembly after the injection moulding procedure. The rotary valve comprises a valve house with a plug inside it, and the rotary valve has sealing means in the form of local variations in the radius of the plug and house along their lengths. Thereby, a rotary valve is obtained which does not require a viscous sealant, such as silicone, to eliminate the risk of leakage, when the valve is open.

A slip seal having a double profile provides two barriers to withstand the working pressure of a medium acting against the slip when a plug valve is in the closed position.

The invention in question is a sealing method for injection molded polypropylene plastic valves, allowing simple and safe sealing of the valve in closed, semi-open and open positions without having to manually add the sealing material, as well as the sealing rib related to the method. The type of valve comprises of two parts (see FIG. 1): a) The Valve Body (2) with inlet (7), outlet (8) and a chamber for the Valve Core (1) b) The Valve Core (1), with the handle (4), valve opening (6) and sealing material (3) The invented method is using double injection techniques to shape the polypropylene Valve Core (1) of the valve in the first injection stage and then apply the thermoplastic elastomer sealing material (3) to the surface of the polypropylene Valve Core (1) in the second stage. In this way the Valve Core (1) and the Sealing Material (3) is made as one part in one single process, but with two separate injection stages. The Sealing Material (3) which is adhered to the surface of the Valve Core (1) is creating a sealing barrier where there is interference between the Sealing Material (3) and the Valve Body (2). The actual sealing is made by a protruded Sealing Rib (5) at the edges of the area of the Sealing Material (3). The elastomer Sealing Rib (5), which will seal against the inner surface of the Valve Body (2), is carefully measured to ensure proper sealing in all open/closing stages, while at the same time not adding too much friction between the parts. This way proper sealing is achieved, without having to increase the torque required to open and close the valve.

A stop valve includes a valve body having a receiving space, a shaft rotatably mounted in the receiving space of the valve body, and an operation member mounted on the shaft. The shaft has a shaft body and a driven portion. The shaft body is provided with a connecting hole. The shaft body has a periphery provided with two retaining grooves for mounting two seal rings. The two seal rings are directly formed in the two retaining grooves of the shaft body in a secondary molding mode so that the two seal rings and the two retaining grooves of the shaft body have greater strength of combination, such that the two seal rings will not be detached from the two retaining grooves of the shaft body, thereby preventing from incurring fluid leakage.

An angle valve structure includes an angle valve body. The angle valve body is provided with a water inlet channel, a water outlet channel and an accommodation cavity. The accommodation cavity is rotationally provided with a valve core. One end of the valve core exposed outside the accommodation cavity is fixedly connected with a knob. The valve core is provided with a sealing block for sealing the water outlet channel when sealing. The valve core includes a main body part and an elastic arm whose one end is connected with the main body part. One side of the main body part is provided with a mounting slot for placing the sealing block, one side of the elastic arm is provided with an extrusion portion, and the other side of the elastic arm is provided with a contact portion against the sealing block after assembly.