US3721264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination shut-off check and pressure surge relief valve
Assignee: Individual
•
Filing: 1971-10-20
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Granted: 1973-03-20
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Expires: 1991-10-20
Abstract
Abstract A threaded manually rotatable valve stem screws into the valve body with the valve head slideably mounted on the inner end of the stem and biased downwardly by a very light coil spring into engagement with the valve seat. When the stem is screwed to its innermost limit, it positively forces the valve head against the valve seat in ''''shut-off'''' position. When water under substantial (normal) pressure is delivered to the in-flow chamber of the valve, its flow through the valve is prevented when the latter is thus shut off. When the stem is now reversely screwed manually to release the valve head from downward pressure by the stem, the incoming water pressure readily overcomes the light spring pressure biasing the valve head downwardly and lifts the valve head until further upper movement of the valve head is prevented by its coming into contact with the stem. This of course opens the valve to a flow of water through the same, with practically the same effect as if the valve head were directly mounted on the stem. When a temporary failure of the supply of water to the valve occurs, the valve head is automatically lowered by its biasing spring into engagement with the valve seat, thus closing the valve against a reverse flow of liquid therethrough. A pressure surge relief piston is slideable on said stem in a bore provided in the valve body (which bore connects with the out-flow chamber), this piston being biased downwardly by a heavy coil spring, with screw controlled tension, said tension being set to confine liquid under normal operating pressures but to yield to an abnormal pressure surge, thereby uncovering ports leading from said bore and relieving the out-flow chamber and the domestic water system connected therewith of said abnormal pressure surge.
Inventors
- 👤 D Coughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:12
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/12; F24H9/13; F24H9/133; F24H9/136; F16; F16K; F16K1/00; F16K1/32; F16K1/48; F16K1/487; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87233; Y10T137/87241
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
355 words
In a valve the combination of: a hollow valve body divided interiorly by a wall into in-flow and out-flow chambers, there being a valve seat surrounding an opening in said wall communicating between said chambers; internally threaded aperture means on said body concentric with said seat and communicating with said out-flow chamber; a manually rotatable threaded valve stem having a threaded portion which is screwed into said aperture means; a valve head between said stem and said seat and compressible by said stem against said seat to shut off said valve; means for guiding said valve head to maintain it in co-axial alignment with said stem and said seat, and permitting said head freedom to move toward and away from said seat when said stem is retracted from said valve closing portion; light spring means biasing said valve head towards said seat; said biasing action effectively closing said valve to prevent a reverse flow from said out-flow chamber to said in-flow chamber but being ineffective to retard flow from said in-flow chamber to said out-flow chamber of water delivered to said in-flow chamber under normal domestic pressures; said stem having a smooth cylindrical portion extending outwardly from said threaded stem portion, said body having a piston bore concentric with said cylindrical stem portion and disposed thereabout, there being duct means connecting the inner end of said bore with said out-flow chamber; a piston slideable on said smooth stem portion and within said bore; a relatively heavy coil spring biasing said piston downward against the bottom of said bore; a screw plug means making threaded engagement with said body to adjustably compress said spring against said piston; and there being surge escape port means in said body communicating with said bore above the lower end of said piston whereby a surge of fluid pressure building up in said out-flow chamber will be applied to the inner end of said piston until the pressure of said piston against said piston biasing spring will compress the latter and lift the piston until said escape port means is uncovered allowing escape of fluid therethrough until said pressure surge subsides.
Claim 2
Dependent Claim
355 words
In a valve the combination of: a hollow valve body divided interiorly by a wall into in-flow and out-flow chambers, there being a valve seat surrounding an opening in said wall communicating between said chambers; internally threaded aperture means on said body concentric with said seat and communicating with said out-flow chamber; a manually rotatable threaded valve stem having a threaded portion which is screwed into said aperture means; a valve head between said stem and said seat and compressible by said stem against said seat to shut off said valve; means for guiding said valve head to maintain it in co-axial alignment with said stem and said seat, and permitting said head freedom to move toward and away from said seat when said stem is retracted from said valve closing portion; light spring means biasing said valve head towards said seat; said biasing action effectively closing said valve to prevent a reverse flow from said out-flow chamber to said in-flow chamber but being ineffective to retard flow from said in-flow chamber to said out-flow chamber of water delivered to said in-flow chamber under normal domestic pressures; said stem having a smooth cylindrical portion extending outwardly from said threaded stem portion, said body having a piston bore concentric with said cylindrical stem portion and disposed thereabout, there being duct means connecting the inner end of said bore with said out-flow chamber; a piston slideable on said smooth stem portion and within said bore; a relatively heavy coil spring biasing said piston downward against the bottom of said bore; a screw plug means making threaded engagement with said body to adjustably compress said spring against said piston; and there being surge escape port means in said body communicating with said bore above the lower end of said piston whereby a surge of fluid pressure building up in said out-flow chamber will be applied to the inner end of said piston until the pressure of said piston against said piston biasing spring will compress the latter and lift the piston until said escape port means is uncovered allowing escape of fluid therethrough until said pressure surge subsides.
Claim 3
Dependent Claim
52 words
A valve as recited in claim 1 wherein O-ring means seal the space between said piston and said bore, on the one hand, and between said piston and said smooth stem portion, on the other hand, to confine fluid behind said piston until the latter is shifted to uncover said escape ports.
Claim 4
Dependent Claim
273 words
In a valve, the combination of: a hollow valve body divided interiorly by a wall into in-flow and out-flow chambers, there being a valve seat surrounding an opening in said wall communicating between said chambers; internally threaded aperture means on said body concentric with said seat and communicating with said out-flow chamber; a manually rotatable threaded valve stem having a threaded portion which is screwed into said aperture means; a valve head between said stem and said seat, said stem being made effective by screwing it outwardly or inwardly to act on said valve head, on the one hand, to freely allow water, admitted under normal domestic water pressure to said in-flow chamber, to flow through said valve opening into said out-flow chamber or, on the other hand, to shut off such flow; said stem having a smooth cylindrical portion disposed outwardly from said threaded portion; said body having a bore concentric with said stem and surrounding said smooth portion; duct means connecting the inner end of said bore with said out-flow chamber; a surge relief piston slideable on said stem in said bore; means for adjustably biasing said piston against the inner end of said bore; means forming a sliding seal between said piston and said bore, on the one hand, and between said piston and said stem on the other hand; and surging fluid escape ports communicating with said bore above the inner end of said piston, whereby said surge pressure must greatly exceed normal domestic water pressure to lift said piston in said bore and thus effect the escape of fluid through said escape ports until said pressure surge subsides.
Claim 5
Dependent Claim
273 words
In a valve, the combination of: a hollow valve body divided interiorly by a wall into in-flow and out-flow chambers, there being a valve seat surrounding an opening in said wall communicating between said chambers; internally threaded aperture means on said body concentric with said seat and communicating with said out-flow chamber; a manually rotatable threaded valve stem having a threaded portion which is screwed into said aperture means; a valve head between said stem and said seat, said stem being made effective by screwing it outwardly or inwardly to act on said valve head, on the one hand, to freely allow water, admitted under normal domestic water pressure to said in-flow chamber, to flow through said valve opening into said out-flow chamber or, on the other hand, to shut off such flow; said stem having a smooth cylindrical portion disposed outwardly from said threaded portion; said body having a bore concentric with said stem and surrounding said smooth portion; duct means connecting the inner end of said bore with said out-flow chamber; a surge relief piston slideable on said stem in said bore; means for adjustably biasing said piston against the inner end of said bore; means forming a sliding seal between said piston and said bore, on the one hand, and between said piston and said stem on the other hand; and surging fluid escape ports communicating with said bore above the inner end of said piston, whereby said surge pressure must greatly exceed normal domestic water pressure to lift said piston in said bore and thus effect the escape of fluid through said escape ports until said pressure surge subsides.
References Cited (Backward Citations)
US3592226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |