摘要:
A butterfly valve includes a purge gas flow path supplying a purge gas for preventing inflow of a control fluid into a magnetic fluid sealing portion from a flow path through an insertion hole. The purge gas flow path is provided with an opening and closing valve for opening and closing the purge gas flow path and a pressure gauge for measuring a pressure value in the purge gas flow path, in the stated order from the upstream side. The purge gas flow path is connected to a portion between the magnetic fluid sealing portion and the flow path of the butterfly valve on the downstream side of the pressure gauge, and communicates with the flow path through the insertion hole. The butterfly valve further includes a control device that controls at least the opening and closing valve. The control device is provided with a monitoring program for monitoring a pressure value.
摘要:
A metal sealing system for a triple eccentricity butterfly valve includes a dynamic metal seal, having a metal core surrounded by an external coating; a metal case with an external surface that has an inclined conical shape, including a first housing inside which the dynamic metal seal is mounted; a metal cover fixed to the metal case to allow it to close by flush fitting of the upper or lower faces of the metal cover and the metal case, the metal case having a second housing into which the metal cover fits, the dynamic metal seal being located between the metal cover and the surface of the metal case defining the first housing.
摘要:
Valve assemblies with butterfly valves for use as a double isolation & bleed (DIB) valve and a double block & bleed (DBB) valve. The embodiments may have a twin-disc design with a non-separable, valve body having a central bore. A pair of butterfly valves may reside in the central bore, each having an annular seal and a rotatable disc that contacts the annular seal to prevent flow of fluid into space between the butterfly valves. Implementations of the embodiments configure the annular seal with a sloped contact surface at an angle to positively seal the rotatable discs in the preferred direction of incoming flow. In this way, the valves can always close in response to either uni-directional flow into one end of the central bore or bi-directional flow into both ends of the central bore, respectively or simultaneously.
摘要:
Valve assemblies with butterfly valves for use as a double isolation & bleed (DIB) valve and a double block & bleed (DBB) valve. The embodiments may have a twin-disc design with a non-separable, valve body having a central bore. A pair of butterfly valves may reside in the central bore, each having an annular seal and a rotatable disc that contacts the annular seal to prevent flow of fluid into space between the butterfly valves. Implementations of the embodiments configure the annular seal with a sloped contact surface at an angle to positively seal the rotatable discs in the preferred direction of incoming flow. In this way, the valves can always close in response to either uni-directional flow into one end of the central bore or bi-directional flow into both ends of the central bore, respectively or simultaneously.
摘要:
The present disclosure provides a valve device including a housing, a shaft, a butterfly valve, and a sealing member. The butterfly valve has a disk shape and defines a groove formed on an outer circumferential surface. The butterfly valve is fixed to the shaft and housed in a passage in the housing to selectively open and close the passage. The sealing member has an annular shape and fit into the groove. The outer circumferential surface of the sealing member has an arc surface having a diameter equal to the diameter of the passage. The arc surface comes into contact with the inner wall of the passage when the passage is closed.
摘要:
Disclosed is a manual balancing valve having an upstream end and a downstream end, and a first equalizing ring (500a) and a second equalizing ring (500b) configured at the upstream end and the downstream end, respectively. Each of the first and the second equalizing rings comprises an annular body (505) defined between an inner peripheral edge portion (510) and an outer peripheral edge portion (515), an annular chamber (520) configured adjacent to the inner peripheral edge portion, a plurality of holes (525) configured on the inner peripheral edge portion and in fluid communication with the annular chamber, and a pressure tap (T) in fluid communication with the annular chamber and extending radially outward of the annular body. The first and the second equalizing rings are adapted to provide static pressure value at each of the upstream and the downstream ends so as to measure differential pressure therebetween and control the fluid flow rate through the valve.
摘要:
A valve assembly having a valve housing, the valve housing defining a passageway. A flapper valve arranged within the passageway is coupled to a rotatable valve shaft. A flexible wall, sealed along opposed edges to the valve housing, is controllable to at least two positions. The first position seals against the flapper valve and the second position releases the flapper valve allowing for ready movement of the valve.
摘要:
An armature assembly for a solenoid valve allows for a valve member to be retained in the closed position through a biasing force being applied therein. A moveably supported armature bolt is movable between a first position and a second position. A valve member is coupled to the armature bolt and is configured to close with the armature bolt at the second position. An armature body is coupled to the armature bolt. A resilient member adapted to hold the armature bolt at the second position so as to retain the valve member in the closed position.
摘要:
A valve assembly (2) intended for use together with a pallet container (1) and a liner. The valve assembly (2) comprises a valve (3), a valve seal (4) and an outer lip seal (5). The valve assembly (2) further comprises a support member (6) which is constitutes of a lower guide member (61) and an upper guide member (62).
摘要:
A throttle valve includes a throttle body including a housing having an inner surface. The throttle body includes first and second stop surfaces arranged on the inner surface. A throttle plate is rotatable inside the housing of the throttle body about a shaft between closed and open positions. A first projection is located on a first surface of the throttle plate adjacent to a radially outer end of the throttle plate. A second projection is located on a second surface of the throttle plate adjacent to a radially outer end of the throttle plate. The second surface is opposite the first surface. The first and second projections extend outwardly from the throttle plate in opposite directions and in corresponding directions of rotational movement of the throttle plate during closing to bias against the second stop surface when the throttle valve is closed.