US3906987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swing open cross-connection valve
Assignee: Watts Regulator Co
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Filing: 1974-03-13
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Granted: 1975-09-23
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Expires: 1994-03-13
Abstract
Abstract A cross-connection valve, with upstream and downstream valving, which prevents backflow from contaminating the source of liquid is provided with field serviceability features by arranging the upstream valving and backflow discharge passageway means on an access door that normally serves as part of the valve body. A tool is arranged to enter through the discharge passage to hold the upstream valving in assembled condition on the access door, to permit field servicing for repair or replacement of the upstream valving, when the access door is open, and the downstream valving is also accessible for field servicing through the opening for the access door.
Inventors
- 👤 Calvin Rushforth
- 👤 Sebastian David Tine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:51
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/108; F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; Y; Y02; Y02A; Y02A20/00; Y02A20/20; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331; Y10T137/598; Y10T137/6154; Y10T137/7722; Y10T137/7837; Y10T137/7876; Y10T137/8593; Y10T137/86292
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
195 words
In a backflow preventer valve system that includes spaced upstream and downstream valve means arranged to normally prevent a backflow, and a backflow discharge means located between said upstream and downstream valve means, the improvement of a field serviceable backflow preventer comprising, in combination: an elongated valve casing having upstream and downstream ends and longitudinal walls, fixed flow-through structure operatively associated respectively with the upstream and downstream valving means adjacent the respective ends of the casing, an access opening through a longitudinal wall of the valve casing, an access door for normally closing the access opening, the backflow discharge means including a tubular discharge passageway means, movable discharge valving means controlling flow communication between the interior of the valve casing and the tubular discharge passageway means, the upstream valving means including movable valving elements, said discharge valving means and said movable valving elements being carried by said tubular discharge passageway means which, in turn, is carried by said access door, and the size of said access opening permitting the discharge valving means and movable valving elements to be swung to a position outwardly of the confines of the valve casing to permit field servicing thereof.
Claim 2
Dependent Claim
195 words
In a backflow preventer valve system that includes spaced upstream and downstream valve means arranged to normally prevent a backflow, and a backflow discharge means located between said upstream and downstream valve means, the improvement of a field serviceable backflow preventer comprising, in combination: an elongated valve casing having upstream and downstream ends and longitudinal walls, fixed flow-through structure operatively associated respectively with the upstream and downstream valving means adjacent the respective ends of the casing, an access opening through a longitudinal wall of the valve casing, an access door for normally closing the access opening, the backflow discharge means including a tubular discharge passageway means, movable discharge valving means controlling flow communication between the interior of the valve casing and the tubular discharge passageway means, the upstream valving means including movable valving elements, said discharge valving means and said movable valving elements being carried by said tubular discharge passageway means which, in turn, is carried by said access door, and the size of said access opening permitting the discharge valving means and movable valving elements to be swung to a position outwardly of the confines of the valve casing to permit field servicing thereof.
Claim 3
Dependent Claim
30 words
A construction as in claim 1 wherein the downstream valving means is secured to fixed flow-through structure by removable means to which access may be had through the access opening.
Claim 4
Dependent Claim
54 words
A construction as in claim 1 wherein the discharge valving means and the movable valving elements are normally spring biased upstream, and in combination with a tool insertable through the backflow discharge means for holding the spring biased valving means and valving elements constrained to their assembled condition when the access door is opened.
Claim 5
Dependent Claim
43 words
A construction as in claim 3 wherein capture means are provided to engage portions of the tool while other portions of the tool have force applied thereto by the spring bias means to wedge and hold the tool in position against inadvertent withdrawal.
Claim 6
Dependent Claim
53 words
A construction as in claim 1 including an annular abutment wall surrounding the access opening, an annular abutment wall defined on the access door, and lost motion hinge means between the door and casing to permit said abutment walls on the casing and door to abuttingly engage to effect a substantial seal therebetween.
Claim 7
Dependent Claim
63 words
A construction as in claim 1 including spring means carried by elements supported on the access door and oPeratively associated with the movable valving elements to resiliently seat said valving elements against said fixed flow-through structure adjacent the upstream end of the valve casing when the access door is closed, whereby to create a reaction force that aids in opening the access door.
Claim 8
Dependent Claim
61 words
A construction as in claim 1 including spring means operatively associated with the discharge valving means and the movable valving elements to normally bias same in an upstream direction, a valve stem interconnecting said valving means and valving elements, and a tool for selective capture of the stem to restrain the stem, valving means and valving elements against the bias means.
Claim 9
Dependent Claim
107 words
A construction as in claim 1 including spring means operatively associated with the discharge valving means and the movable valving elements to normally bias same in an upstream direction, a valve stem interconnecting said valving means and valving elements, a first tool for entry through the discharge passageway means for capture and restraint of the valving means before the access door is opened, and a second tool for capture of and controlled restraint of the stem after the access door is opened, use of the second tool permitting selective release of the first tool, and use of the first tool permitting selective release of the second tool.
Claim 10
Dependent Claim
117 words
A construction as in claim 1 wherein the tubular discharge passageway means carries thereon axially spaced sleeves and a tool-receiving means located axially in a plane between said axially spaced sleeves, the discharged valving means including spaced valves cooperating with said axially spaced sleeves and interconnected by valve stem means extending transversely of the plane of the tool-receiving means, and a restraint tool selectively enterable in the tool-receiving means and presenting a portion to be engaged by one of the spaced valves of the discharge valving means to effect a capture action wherein the tool holds and restrains the discharge valving means against movement and the discharge means simultaneously engages and restrains the restraint tool from withdrawal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |