Valve construction

Claim 2

A valve construction comprising valve seat means, said valve seat means defining an opening for receiving a valve, said valve seat means also including a seating surface, said valve seat means having a chamfer disposed between said opening and said seating surface, valve means including a sealing surface for engaging said seating surface to provide a seal, said valve means including a poppet portion, spring means operatively connected with said valve means to cause said sealinG surface to engage said seating surface, said poppet portion including a tapered surface movable within said opening for centering the valve means, said poppet portion also including a shoulder adjacent said tapered surface, said shoulder when the valve is in sealing position being disposed within said opening and adjacent said chamfer, said opening defined by said valve seat means being formed by a substantially straight cylindrical surface, said shoulder comprising a substantially straight cylindrical surface fitting relatively closely within said opening with only a slight clearance between said two substantially straight cylindrical surfaces, said chamber having a predetermined dimension in a direction parallel with the axis of movement of said valve means, said shoulder having a predetermined dimension in a direction parallel with the axis of said valve means which is at least about two times as great as said dimension of the chamfer, said tapered part of the poppet portion being substantially frustoconical in configuration, said valve means including an elongated valve stem, said poppet portion being fixedly supported on said valve stem, and a spring retainer means supported on said valve stem and engaging said spring means.

Claim 3

A valve construction comprising valve seat means, said valve seat means defining an opening for receiving a valve, said valve seat means also including a seating surface, said valve seat means having a chamfer disposed between said opening and said seating surface, valve means including a sealing surface for engaging said seating surface to provide a seal, said valve means including a poppet portion, spring means operatively connected with said valve means to cause said sealing surface to engage said seating surface, said poppet portion including a tapered surface movable within said opening for centering the valve means, said poppet portion also including a shoulder adjacent said tapered surface, said shoulder when the valve is in sealing position being disposed within said opening and adjacent said chamfer, said opening defined by said valve seat means being formed by a substantially straight cylindrical surface, said shoulder comprising a substantially straight cylindrical surface fitting relatively closely within said opening with only a slight clearance between said two substantially straight cylindrical surfaces, said chamfer having a predetermined dimension in a direction parallel with the axis of movement of said valve means, said shoulder having a predetermined dimension in a direction parallel with the axis of said valve means which is at least about two times as great as said dimension of the chamfer, said tapered part of the poppet portion being substantially frustoconical in configuration, a second valve means having a second poppet portion and a second sealing surface, said second poppet portion including a tapered surface for centering the second valve means, a second valve seat means including a second seating surface for engaging said second sealing surface to provide a seal therewith, said first-mentioned sealing surface being formed on said second valve means, said first-mentioned valve means being carried by said second valve means, said second poppet portion having a central opening formed therethrough, said opening receiving said first-mentioned valve means, spring means operatively connected with said second valve means, said spring means being received within said central opening.

Claim 4

A valve construction comprising valve seat means, said valve seat means defining an opening for receiving a valve, said valve seat means also including a seating surface, said valve seat means having a chamfer disposed between said opening and said seating surface, valve means including a sealing surface for engaging said seating surface to provide a seal, said valve means including a poppet portion, spring means operatively connected with said valve means to cause said sealing surface to engage said seating surface, said poppet portion including a tapered surface movable within said opening for centering the valve means, said poppet portion also including a shoulder adjacent said tapered surface, said shoulder when the valve is in sealing position being disposed within said opening and adjacent said chamfer, said opening defined by said valve seat means being formed by a substantially straight cylindrical surface, said shoulder comprising a substantially straight cylindrical surface fitting relatively closely within said opening with only a slight clearance between said two substantially straight cylindrical surfaces, said chamfer having a predetermined dimension in a direction parallel with the axis of movement of said valve means, said shoulder having a predetermined dimension in a direction parallel with the axis of said valve means which is at least about two times as great as said dimension of the chamfer, said tapered part of the poppet portion being substantially frustoconical in configuration, a second valve means having a second poppet portion and a second sealing surface, said second poppet portion including a tapered surface for centering the second valve means, a second valve seat means including a second seating surface for engaging said second sealing surface to provide a seal therewith, said first-mentioned sealing surface being formed on said second valve means, said first-mentioned valve means being carried by said second valve means, said second poppet portion having a central opening formed therethrough, said opening receiving said first-mentioned valve means, spring means operatively connected with said second valve means, said spring means being received within said central opening.

Claim 5

A valve construction comprising valve seat means, said valve seat means defining an opening for receiving a valve, said valve seat means also including a seating surface, said valve seat means having a chamfer disposed between said opening and said seating surface, valve means including a sealing surface for engaging said seating surface to provide a seal, said valve means including a poppet portion, spring means operatively connected with said valve means to cause said sealing surface to engage said seating surface, said poppet portioN including a tapered surface movable within said opening for centering the valve means, said poppet portion also including a shoulder adjacent said tapered surface, said shoulder when the valve is in sealing position being disposed within said opening and adjacent said chamfer, second valve means having a second poppet portion and a second sealing surface, said second poppet portion including a tapered surface for centering the second valve means, a second valve seat means including a second seating surface for engaging said second sealing surface to provide a seal therewith, said first-mentioned seating surface being formed on said second valve means, said first-mentioned valve means being carried by said second valve means, said second poppet portion including a tapered surface extending to a point adjacent said second sealing surface and laterally inwardly thereof, said second poppet portion having a central opening formed therethrough, said opening receiving said first-mentioned valve means, spring means operatively connected with said second valve means, said spring means being received within said central opening.

Claim 6

A valve construction comprising valve seat means, said valve seat means defining an opening for receiving a valve, said valve seat means also including a seating surface, said valve seat means having a chamfer disposed between said opening and said seating surface, valve means including a sealing surface for engaging said seating surface to provide a seal, said valve means including a poppet portion, spring means operatively connected with said valve means to cause said sealing surface to engage said seating surface, said poppet portioN including a tapered surface movable within said opening for centering the valve means, said poppet portion also including a shoulder adjacent said tapered surface, said shoulder when the valve is in sealing position being disposed within said opening and adjacent said chamfer, second valve means having a second poppet portion and a second sealing surface, said second poppet portion including a tapered surface for centering the second valve means, a second valve seat means including a second seating surface for engaging said second sealing surface to provide a seal therewith, said first-mentioned seating surface being formed on said second valve means, said first-mentioned valve means being carried by said second valve means, said second poppet portion including a tapered surface extending to a point adjacent said second sealing surface and laterally inwardly thereof, said second poppet portion having a central opening formed therethrough, said opening receiving said first-mentioned valve means, spring means operatively connected with said second valve means, said spring means being received within said central opening.

Claim 7

Apparatus as defined in claim 1 wherein said spring means comprises a stable spring.

Claim 8

Apparatus as defined in claim 1 wherein the seating surface on said valve seat means slopes relative to a plane extending perpendicular to the axis of movement of said valve means.

Claim 9

Apparatus as defined in claim 5 wherein said seating surface includes a flat formed thereon adjacent said chamfer.

Claim 10

Apparatus as defined in claim 1 wherein said sealing surface on the valve means comprises a gasket, and gasket retainer means supported on said valve stem and engaging said gasket for holding the gasket in place.

Claim 11

Apparatus as defined in claim 3 wherein said second poppet portion includes a second tapered surface formed adjacent to and laterally outwardly of said sealing surface.