摘要:
An artificial sphincter includes an inflatable occlusion means for occluding a body passage, a stretchable fluid reservoir, a pump means and an occlusion means. A pressurizing fluid is selectively transferred from the occlusion means to the reservoir for deflating the occlusion means so that a blocked body passage may be opened. The artificial sphincter also includes a semipermeable check valve which always allows fluid flow towards the stretchable fluid reservoir. A semipermeable check valve allows only a restricted fluid flow from the stretchable fluid reservoir. A pressure sensitive check valve is located in between the pressure compensation balloon and the lumen of the balloon holder. The pressure sensitive check valve always allows fluid flow from the pressure compensation balloon towards the lumen so that the fluid contained in the pressure compensation balloon is freely flowable towards the inflatable occlusion means.
摘要:
Valve assemblies for reciprocating downhole pumps are provided. The valve assembly may comprise: a flow cage comprising a housing and a tubular insert; an annular valve seat positioned below the tubular insert; and an elongated sealing member positioned above the annular valve seat and at least partially received into the tubular insert. In some embodiments, the elongated sealing member may be more stable and may more securely engage the valve seat compared to spherical valve balls. Related methods are also provided.
摘要:
Apparatuses and methods for pressure regulating check valve assemblies are described. In an example, the check valve assembly comprises a housing defining a fluid passage having a fluid inlet side and a fluid outlet side. A lift check valve positioned within the fluid passage oriented to restrict fluid flow from the fluid inlet side and a second check valve positioned within the fluid passage oriented to restrict fluid flow from the fluid outlet side. A flow dampener is positioned within the fluid passage and between the first and second check valves.
摘要:
An air induction system for filtering a compressible fluid to an electromechanical component mounted on a wheel of a vehicle. The system may make use of a first plurality of float valves arranged in series in a non-linear first flowpath path, with at least one of the float valves forming an inlet for intaking the compressible fluid into the first flowpath, and one being in communication with an inlet of the electromechanical component. Each of the float valves may have a buoyant float valve element therein which is responsive to change position when submerged in water, to close off its respective float valve depending on an angular orientation of the wheel, and thus an angular orientation of the float valve.
摘要:
A shoe sole includes a sole contact portion 42, a ground contact portion 44, a plurality of fluid casings 12 configured to include a pair of fluid casings arranged in the front and rear direction and a pair of fluid casings arranged in the left and right direction between the sole contact portion and the ground contact portion and made of an elastic material, and plurality of valve units 20 and 30 configured to connect the pair of fluid casings in the front and rear direction and the pair of fluid casings in the left and right direction and to permit a flow of a fluid only from fluid casings at a high position to fluid casings at a low position when the sole of the shoe is inclined in the front and rear direction and/or in the left and right direction.
摘要:
Apparatuses for restricting fluid flow through a well conduit comprise a tubular member having a seat member disposed within the tubular member for receiving a plug element. One or both of the seat member or the plug element comprise at least one shape-memory material to facilitate the plug element being able to land on the seat and/or to facilitate the plug element to pass through a seat member or other restriction in the tubular member either before or after landing on a seat.
摘要:
An insertable backflow preventer is presented. The backflow preventer is provided with a cylindrical housing. The housing has a flow transition zone, a proximal orifice/ball seat, a ball with a specific weight that equals or is close to the specific weight of the surrounding fluid, and a distal retaining screen. The housing can have a flange provided on the outside of the housing at one end to facilitate securing the valve in a pipe. The valve is self-cleaning, can be placed in any orientation in a pipe and has low hydraulic head-loss. The valve's unique cost-effective design provides for easy and relative quick installation, eliminates the need to reconfigure existing plumbing, and can be performance tested remotely. Properly installed, it can dramatically improve the security of, for example, potable water sources in a building or other context, and inasmuch as when installed it is not visible, it is tamper proof. The valve can be scaled to any size pipe or tube, and due to its internal flow dynamics is self cleaning. Multiple valves can be installed in series, and balls of varying specific weight can be used in each valve in such a series to allow for contexts where a range of fluids are sent through the same line, or to provide fail-safe operation in the event that contaminants change the specific gravity of the fluid.
摘要:
An insertable backflow preventer is presented. The backflow preventer is provided with a cylindrical housing. The housing has a flow transition zone, a proximal orifice/ball seat, a ball with a specific weight that equals or is close to the specific weight of the surrounding fluid, and a distal retaining screen. The housing can have a flange provided on the outside of the housing at one end to facilitate securing the valve in a pipe. The valve is self-cleaning, can be placed in any orientation in a pipe and has low hydraulic head-loss. The valve's unique cost-effective design provides for easy and relative quick installation, eliminates the need to reconfigure existing plumbing, and can be performance tested remotely. Properly installed, it can dramatically improve the security of, for example, potable water sources in a building or other context, and inasmuch as when installed it is not visible, it is tamper proof. The valve can be scaled to any size pipe or tube, and due to its internal flow dynamics is self cleaning. Multiple valves can be installed in series, and balls of varying specific weight can be used in each valve in such a series to allow for contexts where a range of fluids are sent through the same line, or to provide fail-safe operation in the event that contaminants change the specific gravity of the fluid.
摘要:
A valve chamber is provided inside a valve element including a liquid inlet and a liquid outlet at positions facing each other. Inside the valve chamber, a ball is disposed to be movable in a direction of a straight line connecting the liquid inlet and the liquid outlet. A ball seat is fitted in the liquid inlet portion of the valve element. The ball seat includes a flow path forming the liquid inlet inside itself and allows the ball to be seated at an edge portion of the flow path. The ball seat is made of material having a hexagonal crystal structure and formed while controlling an orientation of a crystal axis so that a C axis which is the crystal axis of the material is oriented in the same direction as a central axis of the flow path forming the liquid inlet.
摘要:
A lash adjuster includes a plunger and a cylinder. The cylinder includes a high-pressure chamber defined therein. The plunger has a valve port provided through a bottom wall thereof. The valve port includes a seat. A spherical valve body is accommodated in the high-pressure chamber. The valve body is made of ceramic material containing silicon nitride. The valve body is arranged to have a surface roughness average (Ra) of equal to or less than 0.13 μm. The valve body is arranged to have a contact pressure of equal to or lower than 1386 Mpa with the seat in a state where the valve port is closed by the valve body.