Liquid dispensing valve

Claim 2

A valve device comprising a housing including spaced apart inlet and outlet ends and an aperture extending therethrough and communicating with each of the inlet and outlet ends, an elongated valve stem mounted within and movable in said aperture, an enlarged sealing member on one end of the stem and being adapted to directly or indirectly seal said one end of the aperture against fluid passage therethrough, said elongated stem having a length which is slightly greater than the distance between the inlet end and the outlet end so as to slightly project beyond the end which is not sealed by said enlarged sealing member, said elongated stem also having an annular recess therein and which recess has a relatively short length extending only for a relatively short portion of the overall length of said elongated stem, the length of said recess being relatively small compared to the distance between said recess and the said one end of said aperture, an annular shoulder formed on said stem at one end of said recess, a convoluted tapering spring disposed within said aperture and being concentrically located about said valve stem, said spring having a convolution at a narrower end thereof engageable with tHe shoulder formed at the one end of said recess and a wider end engageable with the housing to position said stem within said aperture and to permit the sealing members to be disposed in sealing engagement with said housing over said aperture, said last named convolution at the narrower end of said spring having an inner diameter which is less than the diameter of said valve stem.

Claim 3

The device of claim 1, wherein said stem is slidable in said aperture and is adapted to normally seal said aperture against fluid passage therethrough by said spring normally urging said sealing member into sealing engagement with said housing.

Claim 4

The device of claim 2, wherein said housing includes an internal seat proximate the end which is sealed by said sealing member, and which seat is adapted to receive the wider end of said spring.

Claim 5

The device of claim 2, wherein said spring comprises a tapering coil spring.

Claim 6

The device of claim 2, wherein said sealing member is adapted to be mounted externally of said housing to seal said one end thereof against fluid passage through said housing.

Claim 7

The device of claim 2, wherein said housing includes a substantially continuous bead surrounding the aperture of said housing at the one end thereof which is sealed by said sealing member, said continuous bead terminating in a relatively sharp edge.

Claim 8

The device of claim 2, wherein said housing includes a recess at the end thereof which is adapted to be sealed by said sealing member, said recess being sized to receive said stem, said recess also being in communication with said aperture, said stem having a sealing gasket thereon which is adapted to be placed in sealing engagement with said last named end of said housing to seal against fluid flow through said aperture.

Claim 9

The device of claim 1, wherein said housing includes a recess at the one end thereof which is adapted to be sealed by said sealing member, said recess being sized to receive said stem, said recess also being in communication with said aperture, said stem having a sealing gasket thereon which is adapted to be placed in sealing engagement with said last named end of said housing to seal against fluid flow through said housing, said housing including a substantially continuous bead surrounding said aperture and terminating in a relatively sharp edge.

Claim 10

A valve device for control of liquid flow comprising a housing including spaced apart inlet and outlet ends and an aperture extending therethrough between said inlet and outlet ends, an elongated valve stem mounted within and movable in said aperture, an enlarged sealing member on one end of the stem and being adapted to seal one end of the aperture against fluid passage therethrough, said enlongated stem having a length which is slightly greater than the distance between the inlet end and the outlet end so as to slightly project beyond the end which is not sealed by said enlarged sealing member, said elongated stem also having an annular recess therein and which recess has a relatively short length extending only for a relatively short portion of the overall length of said elongated stem, the length of said recess being relatively small compared to the distance between said recess and the said sealing member, an annular shoulder formed on said stem at one end of said recess, a convoluted tapering coil spring disposed within in said aperture and being concentrically located about said valve stem, said spring having a convolution at a narrower end thereof engageable with the shoulder formed at the one end of said recess and a wider end engageable with the housing in said aperture to position said stem within said aperture and normally urging said enlarged sealing member into sealing engagement with the one end of said housing which is sealed by said sealing member, said last named convolution at the narrower end of said spring having an inner diameter which is less than the diameter of said valve stem, the convolutions of said spring being spaced suffiCiently close together so that upon compression thereof, the convolutions will have a space therebetween sufficiently smaller than the size of foreign matter particles entrained in or carried by the liquid to effectively filter the foreign matter particles contained in the liquid while permitting the liquid to pass through the spaces between the convolutions.

Claim 11

A valve device for control of liquid flow comprising a housing including spaced apart inlet and outlet ends and an aperture extending therethrough between said inlet and outlet ends, an elongated valve stem mounted within and movable in said aperture, an enlarged sealing member on one end of the stem and being adapted to seal one end of the aperture against fluid passage therethrough, said enlongated stem having a length which is slightly greater than the distance between the inlet end and the outlet end so as to slightly project beyond the end which is not sealed by said enlarged sealing member, said elongated stem also having an annular recess therein and which recess has a relatively short length extending only for a relatively short portion of the overall length of said elongated stem, the length of said recess being relatively small compared to the distance between said recess and the said sealing member, an annular shoulder formed on said stem at one end of said recess, a convoluted tapering coil spring disposed within in said aperture and being concentrically located about said valve stem, said spring having a convolution at a narrower end thereof engageable with the shoulder formed at the one end of said recess and a wider end engageable with the housing in said aperture to position said stem within said aperture and normally urging said enlarged sealing member into sealing engagement with the one end of said housing which is sealed by said sealing member, said last named convolution at the narrower end of said spring having an inner diameter which is less than the diameter of said valve stem, the convolutions of said spring being spaced suffiCiently close together so that upon compression thereof, the convolutions will have a space therebetween sufficiently smaller than the size of foreign matter particles entrained in or carried by the liquid to effectively filter the foreign matter particles contained in the liquid while permitting the liquid to pass through the spaces between the convolutions.