초록 ▼

A valve device for use in filling cartons includes a tubular housing containing a valve member comprising a closure part co-operating with a valve seat at the lower extremity of the housing, and a driving part movably received with clearance in the housing. During the latter part of the opening move

A valve device for use in filling cartons includes a tubular housing containing a valve member comprising a closure part co-operating with a valve seat at the lower extremity of the housing, and a driving part movably received with clearance in the housing. During the latter part of the opening movement of the valve member against a spring, the clearance increases smoothly and considerably, and the driving part reaches a force equilibrium position at which the clearance is considerable. Two grooves formed in the housing and the valve member immediately below the annulus of sealing bound an annular enclosed space for receiving liquid squeezed out downwardly at the valve seat.

대표청구항 ▼

A valve device for controlling liquid flow comprising a tubular housing, an annular valve seat on said housing and substantially co-axial therewith and bounding an internal surface of said housing and a valve member including a valve closure part and extending substantially co-axially in said housin

A valve device for controlling liquid flow comprising a tubular housing, an annular valve seat on said housing and substantially co-axial therewith and bounding an internal surface of said housing and a valve member including a valve closure part and extending substantially co-axially in said housing and movable relative to said housing downwardly axially thereof from a closed condition in which said closure part acts sealingly against said valve seat round an annulus of sealing to an open condition in which said closure part is spaced from said valve seat, said housing having wetted internal surface portions which when liquid passes downwardly through said housing when said closure part is open are normally contacted by said liquid and said valve member having wetted external surface portions which when said liquid passes downwardly through said housing when said closure part is open are normally contacted by said liquid, at least one of said wetted internal surface portions of said housing below and thus downstream of said annulus of sealing and said wetted external surface portions of said valve closure part below and thus downstream of said annulus of sealing bounding an annular groove substantially co-axial with said housing for receiving and retaining liquid squeezed out downwardly at said valve seat, said groove, when said closure part is in said closed condition, forming part of a substantially enclosed space between said housing and said closure part for receiving and retaining liquid squeezed out downwardly at said valve seat, and said space extending downwardly from immediately adjacent to said valve seat to the lower extremities of said housing and said valve member, whereby neither said housing nor said valve member has any substantial wetted surface portions below the lowermost extremity of said space.