Valve assembly

An assembly for use in controlling a flow of fluid through a conduit, said assembly comprising a valve movable between a closed condition at least partially blocking fluid flow through the conduit and an open condition in which said valve is ineffective to block fluid flow through the conduit, a housing connectable with the conduit, a valve stem connected with said valve and at least partially enclosed by said housing, a drive member at least partially disposed in said housing and disposed in engagement with said valve stem, said drive member having a central passage in which at least a portion of said valve stem is disposed, a gear assembly at least partially disposed in said housing and connected with said drive member, said gear assembly having a central passage in which at least a portion of said valve stem is disposed, a clutch assembly at least partially disposed in said housing and operable between an engaged condition and a disengaged condition, said clutch assembly having a central passage in which at least a portion of said valve stem is disposed, and an electric motor connected with said clutch assembly and operable to move said drive member under the influence of force transmitted to said gear assembly through said clutch assembly when said clutch assembly is in the engaged condition, said electric motor having a central passage in which at least a portion of said valve stem is disposed.

An assembly for use in controlling a flow of fluid through a conduit, said assembly comprising a valve movable between a closed condition at least partially blocking fluid flow through the conduit and an open condition in which said valve is ineffective to block fluid flow through the conduit, a housing, a valve stem connected with said valve and at least partially enclosed by said housing, said valve stem having a central axis which extends through said valve, a drive member at least partially disposed in said housing, said drive member being disposed in a coaxial relationship with said valve stem, a gear assembly at least partially disposed in said housing and connected with said drive member, said gear assembly being disposed in a coaxial relationship with said valve stem, a clutch assembly at least partially disposed in said housing and operable between an engaged condition and a disengaged condition, said clutch assembly being disposed in a coaxial relationship with said valve stem, an electric motor connected with said clutch assembly and operable to move said drive member under the influence force transmitted through said gear assembly and through said clutch assembly when said clutch assembly is in the engaged condition, said electric motor being disposed in a coaxial relationship with said valve stem, and a spring connected with said housing and said drive member, said spring being stressed to store energy upon movement of said drive member, said spring being effective to move said drive member relative to said housing to move said valve from the open condition to the closed condition, said spring being disposed in a coaxial relationship with said valve stem.

An assembly for use in controlling a flow of fluid through a conduit, said assembly comprising a valve movable between a dosed condition at least partially blocking fluid flow through the conduit and an open condition in which said valve is ineffective to block fluid flow through the conduit, a housing connectable with the conduit, a valve stem connected with said valve and at least partially enclosed by said housing, a drive member at least partially disposed in said housing and disposed in engagement with said valve stem, said drive member having a central passage in which at least a portion of said valve stem is disposed, a gear assembly at least partially disposed in said housing and connected with said drive member, said gear assembly having a central passage in which at least a portion of said valve stem is disposed, an electric motor connected with said gear assembly and operable to move said drive member under the influence of force transmitted through said gear assembly to move said valve from the closed condition to the open condition, and a spring connected with said housing and having a central passage in which at least a portion of said valve stem is disposed, said spring being at least partially disposed in a central passage in said motor and being effective to move said drive member relative to said valve stem to move said valve from the open condition to the closed condition.

An assembly for use in controlling a flow of fluid through a conduit, said assembly comprising a valve movable between a closed condition at least partially blocking fluid flow through the conduit and an open condition in which said valve is ineffective to block fluid flow through the conduit, a housing, a valve stem connected with said valve and at least partially enclosed by said housing, a drive member having an internal thread convolution which cooperates with an external thread convolution on said valve stem, a gear assembly at least partially disposed in said housing and connected with said drive member, a clutch assembly at least partially disposed in said housing and operable between an engaged condition and a disengaged condition, an electric motor at least partially disposed in said housing and operable to rotate said drive member relative to said valve stem under the influence force transmitted from said electric motor through said gear assembly and through said clutch assembly when said clutch assembly is in the engaged condition, a spring connected with said housing and said drive member and disposed in a coaxial relationship with and extending at least part way through said electric motor and said clutch assembly, said spring being stressed to store energy upon movement of said drive member relative to said valve stem, said spring being effective to move said drive member relative to said valve stem to move said valve from the open condition to the closed condition, first and second pressure chambers disposed in said housing, a first conduit to conduct fluid pressure from a first side of said valve to said first pressure chamber, and a second conduit to conduct fluid pressure from a second side of said valve to said second pressure chamber.

An assembly for use in controlling a flow of fluid through a conduit, said assembly comprising a valve movable between a closed condition at least partially blocking fluid flow through the conduit and an open condition in which said valve is ineffective to block fluid flow through the conduit, a housing, a valve stem connected with said valve and at least partially enclosed by said housing, a drive member disposed in engagement with said valve stem, a gear assembly at least partially disposed in said housing and connected with said drive member, a clutch assembly at least partially disposed in said housing and operable between an engaged condition and a disengaged condition, said clutch assembly being connected with said drive member and with said gear assembly, an electric motor at least partially disposed in said housing and operable to move said drive member relative to said valve stem under the influence force transmitted from said electric motor through said gear assembly and through said clutch assembly to said drive member when said clutch assembly is in the engaged condition, said electric motor being disposed in said housing at a location which is closer to said valve than a location where said gear assembly is disposed in said housing, said electric motor includes a rotor and a stator, said rotor being rotatable relative to said valve stem during operation of said electric motor with said clutch assembly in the engaged condition, and a spring connected with said housing and said drive member, said spring being stressed to store energy upon movement of said drive member relative to said valve stem, said spring being effective to move said drive member relative to said valve stem to move said valve from the open condition to the closed condition, first and second pressure chambers disposed in said housing, said first pressure chamber having a side surface connected with said valve stem, said second pressure chamber having a side surface connected with said valve stem, a first conduit to conduct fluid pressure from a first side of said valve to said first pressure chamber, and a second conduit to conduct fluid pressure from a second side of said valve to said second pressure chamber.