US3828812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-monitoring relief valve
Assignee: Individual
•
Filing: 1972-06-14
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Granted: 1974-08-13
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Expires: 1992-06-14
Abstract
Abstract A pressure-monitoring relief valve for a filter comprises a pressure-monitoring member slidable in a bore in a relief valve member against a spring in response to differential pressure between its ends, one of which bears against a lever on a shaft carrying an indicator. The relief valve member is applied against its seat by a further spring. The indicator gives a progressive external indication of increasing pressure drop across the filter and a further external indication movement when the relief valve opens due to the filter being clogged.
Inventors
- 👤 B Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:53
CPC Classifications
F; F16; F16K; F16K37/00; F16K37/0025; F16K37/0041; F16K17/00; F16K17/02; F16K17/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7931; Y10T137/794; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
241 words
A pressure-monitoring relief valve comprising a valve seat having an opening therethrough, a relief valve member cooperating with said valve seat to close said opening when said valve member is applied against said valve seat, said relief valve member having a passage therethrough, a pressure-monitoring member movable in said passage over a range of positions in response to changes in fluid pressure between opposite sides of said relief valve, said pressure-monitoring member closing said passage in all positions in said range, first resilient means urging said relief valve member in closing direction towards said valve seat, second resilient means Acting between the said pressuremonitoring member and said relief valve member to urge said pressure-monitoring member to move in said closing direction in said passage, a generally hollow housing wherein said valve seat, said relief valve member and said pressure monitoring member are disposed, and indication means cooperating with said pressuremonitoring member for continuously providing an indication of the position of said pressure-monitoring member, said indication means including a portion within said housing and an external portion outside of said housing connected to said internal portion, said indication means being operatively positioned such that said external portion is operable by displacement of said pressure-monitoring member when said relief valve member is closed, said external portion being operable to a predetermined position to indicate opening of said relief valve member through combined movement of both said pressure-monitoring member and said relief valve member.
Claim 2
Dependent Claim
241 words
A pressure-monitoring relief valve comprising a valve seat having an opening therethrough, a relief valve member cooperating with said valve seat to close said opening when said valve member is applied against said valve seat, said relief valve member having a passage therethrough, a pressure-monitoring member movable in said passage over a range of positions in response to changes in fluid pressure between opposite sides of said relief valve, said pressure-monitoring member closing said passage in all positions in said range, first resilient means urging said relief valve member in closing direction towards said valve seat, second resilient means Acting between the said pressuremonitoring member and said relief valve member to urge said pressure-monitoring member to move in said closing direction in said passage, a generally hollow housing wherein said valve seat, said relief valve member and said pressure monitoring member are disposed, and indication means cooperating with said pressuremonitoring member for continuously providing an indication of the position of said pressure-monitoring member, said indication means including a portion within said housing and an external portion outside of said housing connected to said internal portion, said indication means being operatively positioned such that said external portion is operable by displacement of said pressure-monitoring member when said relief valve member is closed, said external portion being operable to a predetermined position to indicate opening of said relief valve member through combined movement of both said pressure-monitoring member and said relief valve member.
Claim 3
Dependent Claim
38 words
The relief valve of claim 1 in which said passage in said relief valve member includes a bore constituting at least part of said passage and said pressure-monitoring member is slidable in said bore while obturating said bore.
Claim 4
Dependent Claim
75 words
The relief valve of claim 2 in which said indication means also includes a shaft mounted for angular movement about the axis thereof, said internal portion including an arm carried by said shaft and contacting an end portion of said pressure-monitoring member that projects outside of said bore to be positively moved by said pressure-monitoring member and in turn angularly moved said shaft, said external portion including a visual indicating element mounted on said shaft.
Claim 5
Dependent Claim
34 words
The relief valve of claim 3 in which each end of said shaft extends through respective wall portions of said housing, the diameters of said shaft portions passing through said wall portions being equal.
Claim 6
Dependent Claim
68 words
The relief valve of claim 1 in which said indication means also includes a shaft mounted for angular movement about the axis thereof, said internal portion including an arm carried by said shaft and contacting said pressure-monitoring member to be positively moved by the latter and in turn angularly move said shaft, said external portion including a visual indicating element mounted on said shaft for positive movement therewith.
Claim 7
Dependent Claim
34 words
The relief valve of claim 5 in which each end of said shaft extends through respective wall portions of said housing, the diameters of said shaft portions passing through said wall portions being equal.
Claim 8
Dependent Claim
54 words
The relief valve of claim 5 in which the arm of the indication means engaged by the pressure-monitoring member is moved by the relief valve member when the latter in moving off of said valve seat moves the pressure-monitoring member whereby said indication means is operated to show that the relief valve is open.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |