A plug valve including a valve body defining an internal cavity, a first passage, and a second passage, a plug defining a third passage and being rotatable within the internal cavity, and an insert extending within the internal cavity between the valve body and the plug. The insert defines an interior surface and an opening aligned with the first passage of the valve body. The insert may also define a sealing surface extending around the opening and standing in relief against the interior surface to sealingly engage the plug. In addition to, or instead of, the sealing surface, the insert may define a projection at least partially defining the interior surface. In addition, a boot may be connected to the valve body and interlocked with the projection to prevent, or at least reduce, rotation of the insert relative to the valve body when the plug rotates within the internal cavity.

A plug valve including a valve body defining an internal cavity, a first passage, and a second passage, a plug defining a third passage and being rotatable within the internal cavity, and an insert extending within the internal cavity between the valve body and the plug. The insert defines an interior surface and an opening aligned with the first passage of the valve body. The insert may also define a sealing surface extending around the opening and standing in relief against the interior surface to sealingly engage the plug. In addition to, or instead of, the sealing surface, the insert may define a projection at least partially defining the interior surface. In addition, a boot may be connected to the valve body and interlocked with the projection to prevent, or at least reduce, rotation of the insert relative to the valve body when the plug rotates within the internal cavity.

Disclosed is a dual flow switching device, comprising a valve body, a valve element, a spring, an inner valve seat and an outer valve seat, wherein the valve element is arranged through the valve body; the middle part of the valve element is provided with an axial liquid channel and a radial liquid channel; the valve element is provided with upper and lower sealing elements; the outlet of the radial liquid channel is located between the upper and lower sealing elements; the outer valve seat is provided in a corresponding position of the upper sealing element and the inner valve seat in a corresponding position of the lower sealing element; the spring is sleeved on the valve element, and a spring seat is provided on the valve element at the upper end of the upper sealing element. The present utility model boasts a dual-outflow channel and dual-flow outflow function.

The present disclosure discloses an auto-switching tee joint, including a transitional tube, a first inlet tube, a second inlet tube and an outlet tube. The first inlet tube and the second inlet tube are disposed at two ends of the transitional tube, and the outlet tube is connected at a side wall of the transitional tube. In the transitional tube, there is provided with a switching ball which is movable freely. Both the first inlet tube and the second inlet tube have a bell-mouth which faces the transitional tube. The switching ball has a diameter larger than a minimum inner diameter of the bell-mouth and larger than an inner diameter of the outlet tube. The present disclosure further provides a device for washing and drying clamps which adopts the above auto-switching tee joint and can accomplish the washing and drying of clamps, save costs and improve working efficiency.

The present disclosure discloses an auto-switching tee joint, including a transitional tube, a first inlet tube, a second inlet tube and an outlet tube. The first inlet tube and the second inlet tube are disposed at two ends of the transitional tube, and the outlet tube is connected at a side wall of the transitional tube. In the transitional tube, there is provided with a switching ball which is movable freely. Both the first inlet tube and the second inlet tube have a bell-mouth which faces the transitional tube. The switching ball has a diameter larger than a minimum inner diameter of the bell-mouth and larger than an inner diameter of the outlet tube. The present disclosure further provides a device for washing and drying clamps which adopts the above auto-switching tee joint and can accomplish the washing and drying of clamps, save costs and improve working efficiency.

A device for opening or closing a seal seat of a valve arranged in a pipe for liquid or gaseous media includes a one-time only activation of the valve using a shape memory actuator. The shape memory actuator changes its external shape abruptly when a transformation temperature is reached that is dependent upon its alloy composition. The transformation temperature can be generated by a controllable electrical heating device of the device.

A device for opening or closing a seal seat of a valve arranged in a pipe for liquid or gaseous media includes a one-time only activation of the valve using a shape memory actuator. The shape memory actuator changes its external shape abruptly when a transformation temperature is reached that is dependent upon its alloy composition. The transformation temperature can be generated by a controllable electrical heating device of the device.

A three-position booster valve mechanism includes an operating member for moving a supply and exhaust valve. A piston-cylinder control system is provided for moving the operating member between a first position in which the supply and exhaust valve are closed, a second position in which the supply valve is open and the exhaust valve is closed, and a third position in which the supply valve is closed and the exhaust valve is open. A pilot port is provided for moving the operating member in between the first, second and third positions in dependence of a pilot pressure. The piston-cylinder control system connects to the operating member at a central point of application in between the supply and exhaust valve. The operating member extends in opposing directions from the central point of application towards the supply and exhaust valve.

A fluid regulator includes an actuator assembly disposed in a valve body. A sleeve includes a cylindrical wall, a first plate, and a second plate. Each of the first plate and the second plate is disposed in a cavity of the sleeve. A stem extends through the sleeve and is axially aligned with a longitudinal axis of the body, and includes a passage extending partially through the stem. The actuator assembly includes first and second pistons. First, second, third, and fourth chambers are separately disposed between the sleeve, the first or second plate, or the first or second piston. The first and third chambers are in fluid communication, and the second and fourth chambers are in fluid communication via the passage of the stem. The actuator assembly actuates a control element in response to a fluid pressure receivable in the first, second, third, and/or fourth chambers.

A fluid regulator includes an actuator assembly disposed in a valve body. A sleeve includes a cylindrical wall, a first plate, and a second plate. Each of the first plate and the second plate is disposed in a cavity of the sleeve. A stem extends through the sleeve and is axially aligned with a longitudinal axis of the body, and includes a passage extending partially through the stem. The actuator assembly includes first and second pistons. First, second, third, and fourth chambers are separately disposed between the sleeve, the first or second plate, or the first or second piston. The first and third chambers are in fluid communication, and the second and fourth chambers are in fluid communication via the passage of the stem. The actuator assembly actuates a control element in response to a fluid pressure receivable in the first, second, third, and/or fourth chambers.