Valve including resilient seat washer with abutting rigid annular washer

Claim 2

A valve for controlling flow of fluid under pressure, said valve comprising a pair of relatively movable engaging parts having a passageway therethrough for such fluid, an annular washer of resilient material coaxial with said passageway and defining a valve seat, the surface of said resilient washer opposed to the surface thereof defining said valve seat heaving a peripheral annular groove, an annular washer of rigid material coaxial with said first washer, said rigid annular washer being angular in cross section having a cylindrical flange which encompasses the first washer and abuts thereagainst and at least one plane flange which is applied axially against a surface of said first washer, said plane flange of said rigid washer being positioned in said annular groove, a valve member associated with said seat defined by said first annular washer and movable thereagainst to stop flow through said passageway, resilient means reacting against said valve member normally to retain the latter against said seat, said valve member having an axial stem extending through said passageway and movable in direction opposed to the direction of the force exerted by said resilient means to move the valve member away from said seat.

Claim 3

The combination set forth in claim 1 in which said rigid washer defines a support for said resilient washer and is preassembled on the latter being secured thereto both by said cylindrical flange and by said plane flange.

Claim 4

The combination set forth in claim 1 in which said cylindrical flange is of height substantially the same as the thickness of the resilient washer.

Claim 5

The combination set forth in claim 1 in which said rigid washer is substantially L-shaped in cross section having a single plane flange.

Claim 6

A valve for controlling flow of fluid under pressure, comprising a base having an axial bore therethrough internally threaded at one end, a plug having an axial bore therethrough, said plug having an externally threaded portion coacting with the internally threaded bore in said base for releasable mount of said plug, said base bore having reduced diameter portions defining a cavity having a port at one end and an annular shoulder at its other end, said plug having a cylindrical hollow boss coaxial with the plug bore, a resilient washer encompassing said boss and having its outer periphery seated on said shoulder, the portion of said resilient washer extending inwardly of said seated outer periphery defining a valve seat, an annular washer of rigid material coaxial with said resilient washer, said rigid washer being angular in cross section having a cylindrical flange which encompasses the resilient washer and abuts thereagainst and is seated on said shoulder and at least one plane flange which is applied axially against a surface of said resilient washer, an additional annular shoulder in said base bore between said first annular shoulder and the internally threaded portion of said base bore, said washers being normally of thickness greater than the length of the wall portions between said shoulders, whereby when said plug is screwed into the threaded portion of said base bore into abutment with said additional annular shoulder, the peripheral portion of said resilient washer and said cylindrical flange resting on said first annular shoulder will be compressed to form a dependable seal, said boss protruding beyond the surface of said washer, a valve member movable in said cavity and having an axial stem extending outwardly from one end thereof through the bore in said plug, said end having and annular rim coaxial with said stem, resilient means in said cavity urging said valve member in direction to move said rim against the valve seat portion of said resilient washer to define a seal to close off connection between said plug bore and said cavity, said boss limiting the movement of said valve member.

Claim 7

A valve for controlling flow of fluid under pressure, comprising a base having an axial bore therethrough internally threaded at one end, a plug having an axial bore therethrough, said plug having an externally threaded portion coacting with the internally threaded bore in said base for releasable mount of said plug, said base bore having reduced diameter portions defining a cavity having a port at one end and an annular shoulder at its other end, said plug having a cylindrical hollow boss coaxial with the plug bore, a resilient washer encompassing said boss and having its outer periphery seated on said shoulder, the portion of said resilient washer extending inwardly of said seated outer periphery defining a valve seat, an annular washer of rigid material coaxial with said resilient washer, said rigid washer being angular in cross section having a cylindrical flange which encompasses the resilient washer and abuts thereagainst and is seated on said shoulder and at least one plane flange which is applied axially against a surface of said resilient washer, an additional annular shoulder in said base bore between said first annular shoulder and the internally threaded portion of said base bore, said washers being normally of thickness greater than the length of the wall portions between said shoulders, whereby when said plug is screwed into the threaded portion of said base bore into abutment with said additional annular shoulder, the peripheral portion of said resilient washer and said cylindrical flange resting on said first annular shoulder will be compressed to form a dependable seal, said boss protruding beyond the surface of said washer, a valve member movable in said cavity and having an axial stem extending outwardly from one end thereof through the bore in said plug, said end having and annular rim coaxial with said stem, resilient means in said cavity urging said valve member in direction to move said rim against the valve seat portion of said resilient washer to define a seal to close off connection between said plug bore and said cavity, said boss limiting the movement of said valve member.