US3724808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two stage flow control system and pilot
Assignee: Emerson Electric Co
•
Filing: 1972-01-10
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Granted: 1973-04-03
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Expires: 1992-01-10
Abstract
Abstract A compound pilot of multiple function provides a greatly simplified two stage flow control valve and flow regulator.
Inventors
- 👤 H Sugden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:07
CPC Classifications
F; F16; F16K; F16K21/00; F16K21/04; F16K21/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
435 words
A flow control system for delivering fluid at a predetermined high flow rate, then automatically reducing the flow to a lower flow rate, and then cutting off flow altogether, comprising a conduit for carrying said fluid, said conduit having a valve seat opening between inlet and outlet sides of said conduit, main valve means cooperative with said valve seat opening for controlling flow through said conduit; expansible chamber means for actuating said main valve means; pilot means for controlling said expansible chamber means, said pilot means comprising a casting having a first port connected to said conduit inlet side, a second port connected to said expansible chamber means and a third port connected to said conduit outlet side, a first chamber and a second chamber in said casting, said first port communicating with said first chamber, and said second port communicating with said second chamber, first passage means in said casting between said first chamber and said second chamber, first remotely operable valve means for selectively opening and closing said first passage means, second passage means in said casting between said second chamber and said third port, second remotely operable valve means for selectively opening and closing the end of said second passage means communicating with said second chamber, third passage means in said casting between said first chamber and said second passage means, pilot valve means for variably restricting the end of said third passage means communicating with said first chamber, said pilot valve means comprising a valve member associated with said first chamber end of said third passage means and a pressure responsive element connected to actuate said valve member, and restriction means in said pilot means for restricting communication between said third passage means and said outlet side of said conduit; and control circuit means for closing said first remotely operable valve means and opening said second remotely operable valve means to apply to said expansible chamber means a pressure dependent on the position of said pilot valve means, thereafter opening said first remotely operable valve means and closing said second remotely operable valve means to apply upstream pressure to said expansible chamber means thereby partially closing said main valve means, thereafter closing said first remotely operable valve means while maintaining said second remotely operable valve means closed to maintain A constant quantity of fluid in said expansible chamber means thereby maintaining said main valve in a partially closed position, and thereafter opening said first remotely operable valve means while maintaining said second remotely operable valve means closed to apply upstream pressure to said expansible chamber means thereby closing said main valve.
Claim 2
Dependent Claim
435 words
A flow control system for delivering fluid at a predetermined high flow rate, then automatically reducing the flow to a lower flow rate, and then cutting off flow altogether, comprising a conduit for carrying said fluid, said conduit having a valve seat opening between inlet and outlet sides of said conduit, main valve means cooperative with said valve seat opening for controlling flow through said conduit; expansible chamber means for actuating said main valve means; pilot means for controlling said expansible chamber means, said pilot means comprising a casting having a first port connected to said conduit inlet side, a second port connected to said expansible chamber means and a third port connected to said conduit outlet side, a first chamber and a second chamber in said casting, said first port communicating with said first chamber, and said second port communicating with said second chamber, first passage means in said casting between said first chamber and said second chamber, first remotely operable valve means for selectively opening and closing said first passage means, second passage means in said casting between said second chamber and said third port, second remotely operable valve means for selectively opening and closing the end of said second passage means communicating with said second chamber, third passage means in said casting between said first chamber and said second passage means, pilot valve means for variably restricting the end of said third passage means communicating with said first chamber, said pilot valve means comprising a valve member associated with said first chamber end of said third passage means and a pressure responsive element connected to actuate said valve member, and restriction means in said pilot means for restricting communication between said third passage means and said outlet side of said conduit; and control circuit means for closing said first remotely operable valve means and opening said second remotely operable valve means to apply to said expansible chamber means a pressure dependent on the position of said pilot valve means, thereafter opening said first remotely operable valve means and closing said second remotely operable valve means to apply upstream pressure to said expansible chamber means thereby partially closing said main valve means, thereafter closing said first remotely operable valve means while maintaining said second remotely operable valve means closed to maintain A constant quantity of fluid in said expansible chamber means thereby maintaining said main valve in a partially closed position, and thereafter opening said first remotely operable valve means while maintaining said second remotely operable valve means closed to apply upstream pressure to said expansible chamber means thereby closing said main valve.
Claim 3
Dependent Claim
146 words
A pilot for a fluid pressure responsive valve having a pressure responsive main valve, said pilot comprising a casting having first, second and third ports; a first chamber and a second chamber in said casting; said first port communicating with said first chamber, said second port communicating with said second chamber; first passage means between said first chamber and said second chamber; first remotely operable valve means in said casting for selectively opening and closing said first passage means; second passage means between said second chamber and said third port; second remotely operable valve means in said casting for selectively opening and closing the end of said second passage means communicating with said second chamber; third passage means between said first chamber and said second passage means; and pilot valve means for variably restricting the end of said third passage means communicating with said first chamber.
Claim 4
Dependent Claim
146 words
A pilot for a fluid pressure responsive valve having a pressure responsive main valve, said pilot comprising a casting having first, second and third ports; a first chamber and a second chamber in said casting; said first port communicating with said first chamber, said second port communicating with said second chamber; first passage means between said first chamber and said second chamber; first remotely operable valve means in said casting for selectively opening and closing said first passage means; second passage means between said second chamber and said third port; second remotely operable valve means in said casting for selectively opening and closing the end of said second passage means communicating with said second chamber; third passage means between said first chamber and said second passage means; and pilot valve means for variably restricting the end of said third passage means communicating with said first chamber.
Claim 5
Dependent Claim
54 words
The pilot of claim 2 wherein the pilot valve means comprises a valve member associated with said first chamber end of said third passage means and a pressure responsive element connected to actuate said valve member, said pressure responsive element having one side exposed to a control chamber defined in part by said casting.
Claim 6
Dependent Claim
82 words
The pilot of claim 3 including a first further port in said casting comprising an outer section having means for attaching a control fluid pressure conduit or for mounting a closure device, and an inner section, and a control bore in said casting connecting said third port with said control chamber through said inner section, and means for mounting a device in said inner section to close said passage means when a control fluid pressure conduit is connected to said outer section.
Claim 7
Dependent Claim
92 words
The pilot of claim 4 including a cup-shaped casing member, the rim of said casing member being secured to said casting, the periphery of said pressure responsive element being secured between said rim and said casting, a port in said second casing member including means for removably mounting a closure device or a fluid pressure conduit to said port, an intermediate section in said further port in said casting and a second control bore connecting said intermediate section to said control chamber when a closure device is mounted in said inner section.
Claim 8
Dependent Claim
88 words
The pilot of claim 3 including control passage means within the casting connecting said third port with said control chamber, a further port in said casting connected by a passage to said control chamber and having means for attaching a control fluid pressure conduit or for mounting a closure device, and means for removably mounting a device in said control passage means to close said control passage means between said third port and said control chamber when a control fluid pressure conduit is mounted to said further port.
Claim 9
Dependent Claim
56 words
The pilot of claim 3 wherein the pilot valve member includes a poppet valve part, a stem part and a guide bushing, said stem part being sealingly slidable in said bushing, said bushing being secured in said casting, said bushing defining at least a part of a wall separating said first chamber from said control chamber.
Claim 10
Dependent Claim
65 words
The pilot of claim 2 wherein said second passage means and third passage means comprise a first bore between said first chamber and said second chamber and a second bore between said third port and said first bore, said second passage means including said second bore and a part of said first bore, and said third passage means including another part of said first bore.
Claim 11
Dependent Claim
51 words
The pilot of claim 8 including a third bore intersecting said first bore and said second bore, said first bore Communicating with said second bore through said third bore and a needle valve adjustably mounted in said third bore for variably restricting communication between said first bore and said second bore.
Claim 12
Dependent Claim
33 words
The pilot of claim 8 wherein said first passage means comprises a bore parallel with said first bore, and said first, second and third ports are generally transverse of each of said bores.
Claim 13
Dependent Claim
17 words
The pilot of claim 2 wherein the first and second remotely operable valve means are solenoid valves.
Claim 14
Dependent Claim
94 words
The pilot of claim 2 wherein said first passage means comprises a bore extending through an external wall of the casting and through an internal wall dividing said first chamber from said second chamber, wherein said first remotely operable valve means comprises a piston part slidable in the bore and extending through said second chamber into said interior wall and when said first remotely operable valve means is in its closed position, and wherein said first remotely operable valve means further comprises a reverse-acting solenoid, said piston part being carried by the solenoid plunger.
Claim 15
Dependent Claim
126 words
A pilot for a fluid pressure responsive valve having an expansible control chamber for controlling the position of the valve member, said pilot comprising a casting having first, second and third ports; a first chamber and a second chamber in said casting, said first port communicating with said first chamber and said second port communicating with said second chamber; first linear passage means between said first chamber and said second chamber; second linear passage means between said first passage means and said third port; remotely operable valve means for selectively opening and closing said first passage means between said first chamber and said second passage; and pressure responsive pilot valve means for variably restricting said first passage means between said second chamber and said second passage.
Claim 16
Dependent Claim
126 words
A pilot for a fluid pressure responsive valve having an expansible control chamber for controlling the position of the valve member, said pilot comprising a casting having first, second and third ports; a first chamber and a second chamber in said casting, said first port communicating with said first chamber and said second port communicating with said second chamber; first linear passage means between said first chamber and said second chamber; second linear passage means between said first passage means and said third port; remotely operable valve means for selectively opening and closing said first passage means between said first chamber and said second passage; and pressure responsive pilot valve means for variably restricting said first passage means between said second chamber and said second passage.
Claim 17
Dependent Claim
43 words
The pilot of claim 13 wherein the pilot valve means comprises a valve member and a pressure responsive element connected to actuate said valve member, said pressure responsive element having one side exposed to a control chamber defined in part by said casting.
Claim 18
Dependent Claim
53 words
The pilot of claim 13 including a bore intersecting said first passage means and said second passage means, said first passage means communicating with said second passage means through said bore, and adjustable needle valve means mounted in said bore for restricting communication between said first passage means and said second passage means.
References Cited (Backward Citations)
US3185344A
Cited
US3561468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |