US3741245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block and vent valve
Assignee: CALIFORNIA CONTROLS COMPANY A CORP OF CA
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Filing: 1971-06-09
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Granted: 1973-06-26
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Expires: 1991-06-09
Abstract
Abstract A valve assembly is described of the so-called block and vent type wherein the valve is normally closed with the downstream side vented. When a pilot pressure is applied, it first closes the vent and then opens the valve partially. On application of a second pilot signal from another source or from a suitable time delay network, the valve opens fully. On release of the pilot pressures, the valve closes first and then opens the downstream vent.
Inventors
- 👤 B West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:03
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/122; F16K31/1223; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/87169; Y10T137/87217; Y10T137/87225
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A valve assembly comprising, a valve body defining an inlet passage and an outlet passage, a main valve member and main bias means for retaining said main valve member in a position blocking said inlet passage from said outlet passage, a first piston and means limiting movement thereof to a preselected distance, said first piston being responsive to a first control signal pressure for moving said main valve member a preselected distance to partially unblock said inlet passage from said outlet passage, a second piston connected to said main valve member and having an opening therein, a piston rod extending from said first piston through said opening in said second piston to be slidable therein, an adjustable stop on said rod for engaging said second piston to move same with said first piston, and for allowing said second piston to continue to move in the same direction when said first piston has stopped, said second piston being responsive to a second control signal pressure to move said main valve member to a position whereat said inlet passage is fully unblocked from said outlet passage.
Claim 2
Dependent Claim
184 words
A valve assembly comprising, a valve body defining an inlet passage and an outlet passage, a main valve member and main bias means for retaining said main valve member in a position blocking said inlet passage from said outlet passage, a first piston and means limiting movement thereof to a preselected distance, said first piston being responsive to a first control signal pressure for moving said main valve member a preselected distance to partially unblock said inlet passage from said outlet passage, a second piston connected to said main valve member and having an opening therein, a piston rod extending from said first piston through said opening in said second piston to be slidable therein, an adjustable stop on said rod for engaging said second piston to move same with said first piston, and for allowing said second piston to continue to move in the same direction when said first piston has stopped, said second piston being responsive to a second control signal pressure to move said main valve member to a position whereat said inlet passage is fully unblocked from said outlet passage.
Claim 3
Dependent Claim
187 words
A valve assembly comprising a valve body defining an inlet passage and an outlet passage, a main valve member and main bias means for retaining said main valve member in a position blocking said inlet passage from said outlet passage, a first piston responsive to a first control signal pressure for moving said main valve member a preselected distance to partially unblock said inlet passage from said outlet passage, a second piston connected to said main valve member and responsive to a second control signal pressure to move said main valve member to a position whereat said inlet passage is fully unblocked from said outlet passage, said second piston having an opening therein, said first piston having a piston rod extending therefrom through said opening in said second piston to be slidable therein, an adjustable stop on said rod for engaging said second piston to move same with said first piston and for allowing said second piston to continue to move in the same direction when said first piston has stopped, and a fixed stop provided for limiting movement of said first piston to a preselected distance.
Claim 4
Dependent Claim
187 words
A valve assembly comprising a valve body defining an inlet passage and an outlet passage, a main valve member and main bias means for retaining said main valve member in a position blocking said inlet passage from said outlet passage, a first piston responsive to a first control signal pressure for moving said main valve member a preselected distance to partially unblock said inlet passage from said outlet passage, a second piston connected to said main valve member and responsive to a second control signal pressure to move said main valve member to a position whereat said inlet passage is fully unblocked from said outlet passage, said second piston having an opening therein, said first piston having a piston rod extending therefrom through said opening in said second piston to be slidable therein, an adjustable stop on said rod for engaging said second piston to move same with said first piston and for allowing said second piston to continue to move in the same direction when said first piston has stopped, and a fixed stop provided for limiting movement of said first piston to a preselected distance.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |