A bellows assembly mounts between a movable valve structure and a stationary valve structure of a valve assembly. The bellows assembly includes a bellows and a spacer. The bellows compresses until a gap is closed relative to the spacer. The bellows assembly bears a load through the bellows before the gap is closed, and the bellows assembly bears the load through the bellows and the spacer after the gap is closed.

Sealing system of a device for allowing the passage of a medium, in particular in the high pressure range, is provided with a housing that has a bore hole, a component mounted within the housing such as to oscillate and/or rotate and with a pressure chamber formed within the bore hole. A sealing element surrounding the component adjoins this pressure chamber which can be charged with the medium. An additional metal seal is formed here by the housing and a pressure disc surrounding the component. The outer region is thus tightly closed after the sealing element. In this way, the sealing element is completely tightly encapsulated on the outside.

A throttle valve 10 continuously increases/decreases the flow rate of air flowing through a communication hole 17 through which a first port 11 and a second port 12 are communicated with each other, by using a throttle valve element 22. A valve seat member 15 having the communication hole 17 is attached to a housing 13. An electric motor 25 is attached to a motor housing hole 24 formed in the housing 13. The throttle valve element 22 is driven in an axial direction by a motor shaft 28 of the electric motor 25. A gap between the motor housing hole 24 and the electric motor 25 is sealed by a fixed sealing member 41 having a large diameter, and the motor shaft 28 is sealed by a rotary sealing member 42 having a small diameter, whereby the throttle valve element can be driven by the electric motor having a small output.

A throttle valve 10 continuously increases/decreases the flow rate of air flowing through a communication hole 17 through which a first port 11 and a second port 12 are communicated with each other, by using a throttle valve element 22. A valve seat member 15 having the communication hole 17 is attached to a housing 13. An electric motor 25 is attached to a motor housing hole 24 formed in the housing 13. The throttle valve element 22 is driven in an axial direction by a motor shaft 28 of the electric motor 25. A gap between the motor housing hole 24 and the electric motor 25 is sealed by a fixed sealing member 41 having a large diameter, and the motor shaft 28 is sealed by a rotary sealing member 42 having a small diameter, whereby the throttle valve element can be driven by the electric motor having a small output.

A stop valve and a refrigeration system having the same are provided. The stop valve includes: a valve body, which is provided with a valve port; and a valve core, which is at least partially provided inside the valve body and capable of moving in the valve body along an axis of the valve body to seal or open the valve port. A side of the valve core towards the valve port is provided with a first groove, a first sealing member is embedded in the first groove, the first sealing member is in interference fit with the first groove, a restricting portion is provided on the inner surface of the first groove, and the restricting portion can restrict the first sealing member.

The present invention provides a valve with different threads for preventing rotation of and locking a bonnet with the valve.

Provided is a valve with which a seal member is not damaged when pressure accumulated near the seal member is released. This valve includes a valve box having a valve chamber, a valve seat provided in the valve chamber and having a seat surface, a stem including, at a tip end thereof, a valve element configured to abut against and move away from the seat surface due to an operation of an actuator, a seal space provided with a seal member configured to prevent a fluid from leaking, a seal opening space formed outside the seal space, and a seal pressing member configured to press and fix the seal member to a valve chamber side. The valve box is formed with a leak hole through which the seal space and the outside of the valve box communicate.

Provided is a valve with which a seal member is not damaged when pressure accumulated near the seal member is released. This valve includes a valve box having a valve chamber, a valve seat provided in the valve chamber and having a seat surface, a stem including, at a tip end thereof, a valve element configured to abut against and move away from the seat surface due to an operation of an actuator, a seal space provided with a seal member configured to prevent a fluid from leaking, a seal opening space formed outside the seal space, and a seal pressing member configured to press and fix the seal member to a valve chamber side. The valve box is formed with a leak hole through which the seal space and the outside of the valve box communicate.

A seal structure used in a type of valve in which a valve body is formed at the tip of a valve stem, and the valve is closed or opened by moving the valve stem in the central axial direction, in which a multi-stage seal is formed by continuously arranging multiple stages of annular sealing material in the area where the valve stem slides. The seal structure 30 of the present invention is characterized by including a plurality of stages of combinations of: a C-shaped member 32 having a circular ring with a portion cut out in a circumferential direction of the circular ring; a composite member 33 including a hollow cylindrical portion 33A and a flange 33B extending radially outward on a valve body side of the hollow cylindrical portion 33A in a central axis direction of the hollow cylindrical portion 33A, the hollow cylindrical portion 33A being inserted into a central hollow portion of the C-shaped member 32; and a backup ring 34 and an O-ring 35 placed on the flange 33B of the composite member 33.

A seal structure used in a type of valve in which a valve body is formed at the tip of a valve stem, and the valve is closed or opened by moving the valve stem in the central axial direction, in which a multi-stage seal is formed by continuously arranging multiple stages of annular sealing material in the area where the valve stem slides. The seal structure 30 of the present invention is characterized by including a plurality of stages of combinations of: a C-shaped member 32 having a circular ring with a portion cut out in a circumferential direction of the circular ring; a composite member 33 including a hollow cylindrical portion 33A and a flange 33B extending radially outward on a valve body side of the hollow cylindrical portion 33A in a central axis direction of the hollow cylindrical portion 33A, the hollow cylindrical portion 33A being inserted into a central hollow portion of the C-shaped member 32; and a backup ring 34 and an O-ring 35 placed on the flange 33B of the composite member 33.