US3552432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antirefill safety valve
Assignee: Watsco Inc
•
Filing: 1969-06-03
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Granted: 1971-01-05
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Expires: 1989-06-03
Abstract
Abstract A valve for pressure systems having a spring-urged sealing member attached to a threaded handle in which handle movement is controlled by means of a stop after filling of the pressure system which limits retrograde movement of the handle sufficiently to avoid mechanical opening of the sealing member. Sufficient handle movement is retained to reduce the spring bias against the sealing member to below system pressure so that the sealing member is hydraulically opened by that pressure until discharge of system contents and pressure, whereupon the sealing member is spring-closed and cannot be reopened.
Inventors
- 👤 William Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:59
CPC Classifications
F; F16; F16K; F16K35/00; B; B65; B65D; B65D49/00; B65D49/02; B65D49/08; F16K21/00; F16K21/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7069; Y10T137/7131; Y10T137/7722; Y10T137/7837; Y10T137/7876; Y10T137/7877
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A valve for a pressure system, comprising: a. a housing providing communication between a port and the pressure system for charging and discharging the latter; b. a handle, including a stem portion, in threaded engagement with said housing; c. a spring-urged sealing member for closing and opening communication between said port and said system, said sealing member being mounted for mechanical movement by said handle and for hydraulic movement by system pressure against spring bias; and d. engageable stop means fOr limiting retrograde handle movement to below that required for mechanical opening of said sealing member.
Claim 2
Dependent Claim
96 words
A valve for a pressure system, comprising: a. a housing providing communication between a port and the pressure system for charging and discharging the latter; b. a handle, including a stem portion, in threaded engagement with said housing; c. a spring-urged sealing member for closing and opening communication between said port and said system, said sealing member being mounted for mechanical movement by said handle and for hydraulic movement by system pressure against spring bias; and d. engageable stop means fOr limiting retrograde handle movement to below that required for mechanical opening of said sealing member.
Claim 3
Dependent Claim
22 words
A valve for a pressure system in accordance with claim 1, wherein said engageable stop means is selectively engageable with said handle.
Claim 4
Dependent Claim
34 words
A valve for a pressure system in accordance with claim 1, additionally comprising connecting means to connect between said sealing member and said handle for mechanical opening of said sealing member by said handle.
Claim 5
Dependent Claim
65 words
A valve for a pressure system in accordance with claim 3, wherein: a. said connecting means comprises a slide for said sealing member joined at one end to said handle for movement therewith and having an enlargement at its other end to prevent removal of said sealing member; and b. the spring of said sealing member bears outwardly between said handle and said sealing member.
Claim 6
Dependent Claim
20 words
A valve for a pressure system in accordance with claim 1, wherein said engageable stop means comprises a formable flange.
Claim 7
Dependent Claim
23 words
A valve for a pressure system in accordance with claim 1, wherein said engageable stop means comprises a formable extension of said housing.
Claim 8
Dependent Claim
26 words
A valve for a pressure system in accordance with claim 1, wherein said engageable stop means comprises a collar formed about said stem for engagement therewith.
References Cited (Backward Citations)
US2077210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |