A valve apparatus, such as a downhole valve apparatus, includes a housing having a flow path therein and a valve member mounted within the housing and being operable between closed and open configurations to control flow along the flow path. An actuator assembly is moveable from a first position to a second position to sequentially perform first and second actuation functions, the first actuation function being associated with the operation of an auxiliary system, and the second actuation function opening the valve member from its closed configuration.

A valve apparatus, such as a downhole valve apparatus, includes a housing having a flow path therein and a valve member mounted within the housing and being operable between closed and open configurations to control flow along the flow path. An actuator assembly is moveable from a first position to a second position to sequentially perform first and second actuation functions, the first actuation function being associated with the operation of an auxiliary system, and the second actuation function opening the valve member from its closed configuration.

A control valve includes a valve housing, a joint member, a valve body, and a sealing tube member. The sealing tube member has a biasing pressure receiving surface that receives a pressure of a liquid inside the valve housing and biases the sealing tube member to the valve body side. An area S1 of the biasing pressure receiving surface and an area S2 of a valve sliding contact surface of the sealing tube member are set to satisfy Expressions (1) and (2),
S1<S2≤S1/k   (1)
α≤k<1   (2) where k is a pressure reduction constant of a liquid flowing through a minute gap between the valve sliding contact surface and the valve body, and α is a lower limit value for the pressure reduction constant determined based on physical properties of a liquid.

A control valve includes a valve housing, a joint member, a valve body, and a sealing tube member. The sealing tube member has a biasing pressure receiving surface that receives a pressure of a liquid inside the valve housing and biases the sealing tube member to the valve body side. An area S1 of the biasing pressure receiving surface and an area S2 of a valve sliding contact surface of the sealing tube member are set to satisfy Expressions (1) and (2),
S1<S2≤S1/k   (1)
α≤k<1   (2) where k is a pressure reduction constant of a liquid flowing through a minute gap between the valve sliding contact surface and the valve body, and α is a lower limit value for the pressure reduction constant determined based on physical properties of a liquid.

Disclosed is an auto-drain ball valve with a valve body, a valve bonnet, a valve ball with a circulation hole, and a valve rod. A valve ball hole, which extends from the bottom of the valve ball to the circulation hole, is formed in the valve ball. A rotating shaft at the bottom of the valve ball rotates along with the valve ball and is in threaded connection with an exhaust hole. An axial rotating shaft exhaust hole communicates with a cavity that is formed in the periphery of the rotating shaft. The ball valve is intuitive in structure and provides an exhaust hole that is automatically opened or closed along with rotation of the valve ball to relieve pipeline pressure and extends the service life of the ball valve.

Disclosed is an auto-drain ball valve with a valve body, a valve bonnet, a valve ball with a circulation hole, and a valve rod. A valve ball hole, which extends from the bottom of the valve ball to the circulation hole, is formed in the valve ball. A rotating shaft at the bottom of the valve ball rotates along with the valve ball and is in threaded connection with an exhaust hole. An axial rotating shaft exhaust hole communicates with a cavity that is formed in the periphery of the rotating shaft. The ball valve is intuitive in structure and provides an exhaust hole that is automatically opened or closed along with rotation of the valve ball to relieve pipeline pressure and extends the service life of the ball valve.

A control valve includes a valve housing, a joint member, a valve body, and a sealing tube member. A seal ring, which receives a liquid pressure inside the valve housing and comes into tight contact with the joint member and the sealing tube member, is provided between the joint member and the sealing tube member. The sealing tube member has a biasing pressure receiving surface receiving the liquid pressure inside the valve housing in a direction along a direction of the valve body. The seal ring is disposed at a position where the sealing tube member is not pressurized in the direction of the valve body. An area of a valve sliding contact surface is set to be larger than an area of the biasing pressure receiving surface.

A pressurized food dispensing system including a temperature-controlled barrel, a faceplate coupled to one end of the barrel, a touch-screen activated dispense valve, and a relief valve assembly coupled to the face plate where the relief valve assembly includes: a plug coupled to the face plate, an outer knob, releasably coupled to the plug, and a pin defining a generally conical end about which an O-ring is positioned wherein a spring biases the relief valve assembly towards a closed orientation in which the generally conical element extends into the relief passageway defined by the faceplate and the O-ring is compressed against the faceplate to form a seal.

A pressurized food dispensing system including a temperature-controlled barrel, a faceplate coupled to one end of the barrel, a touch-screen activated dispense valve, and a relief valve assembly coupled to the face plate where the relief valve assembly includes: a plug coupled to the face plate, an outer knob, releasably coupled to the plug, and a pin defining a generally conical end about which an O-ring is positioned wherein a spring biases the relief valve assembly towards a closed orientation in which the generally conical element extends into the relief passageway defined by the faceplate and the O-ring is compressed against the faceplate to form a seal.

A ball valve positioned between a first line and a second line includes a housing and a ball disposed a ball disposed within the housing. The ball includes a bore and is configured to rotate between an open position and a closed position. The ball valve also includes an annular seat disposed between the housing and the ball. The annular seat includes a first annular sealing ring extending circumferentially about a radially-outer surface of the annular seat and an axially-extending passageway extending through the annular seat to enable fluid flow from a valve cavity to an annular space between the annular seat and the housing. The first annular sealing ring, the axially-extending passageway, and the annular space facilitate movement of the annular seat away from the ball as the ball rotates from the closed position toward the open position.