Patent US3596677A successfully refreshed from Google Patents.
US3596677A
Expired / Lapsed
US
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Remotely operable pressure compensated flow control valve
Assignee: Rex Chainbelt Inc
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Filing: 1969-01-13
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Granted: 1971-08-03
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Expires: 1989-01-13
Abstract
Abstract A flow control valve and, more particularly, a pressure compensated flow control valve having a feed spool settable to determine the rate of fluid flow and remote power means for setting the feed spool, more particularly, an electrically operated pilot pressure control unit which can establish a pilot pressure acting on the feed spool and a pressure compensating valve which maintains a nearly constant pressure drop across the feed spool.
Inventors
- 👤 Richard J Clark
- 👤 John L Acheson
- 👤 Lawrence R Landherr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:38
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
255 words
A pressure compensated flow control valve comprising, a body with first and second bores, a feed spool in said first bore having a tapered section coacting with a bore land to define an annular opening and with the opening variable by the relative positioning of the tapered section and land to vary the rate of fluid flow, rate spring means in said first bore providing the sole force urging the feed spool in one direction, a pilot chamber at an end of the first bore to subject an end of the feed spool to pilot pressure acting in opposition to said rate spring means, fluid inlet passage means in said body for directing fluid to said annular opening and including a portion of said second bore, a pressure compensator valve in said second bore, second passage means subjecting said pressure compensator valve to fluid pressure at opposite sides of said annular opening whereby said pressure compensator valve controls the fluid inlet passage means to maintain a nearly constant pressure drop across the annular opening, and pilot pressure setting means to set the pilot pressure at a desired value to position the feed spool for a desired rate of fluid flow including a solenoid operated valve with the last mentioned valve increasing pilot pressure proportional to energization of the solenoid, said rate spring means increasing in resistance in direct proportion to the reduction in length thereof whereby each value of pilot pressure gives a known positioning of the feed spool for a particular rate of flow.
Claim 2
Dependent Claim
255 words
A pressure compensated flow control valve comprising, a body with first and second bores, a feed spool in said first bore having a tapered section coacting with a bore land to define an annular opening and with the opening variable by the relative positioning of the tapered section and land to vary the rate of fluid flow, rate spring means in said first bore providing the sole force urging the feed spool in one direction, a pilot chamber at an end of the first bore to subject an end of the feed spool to pilot pressure acting in opposition to said rate spring means, fluid inlet passage means in said body for directing fluid to said annular opening and including a portion of said second bore, a pressure compensator valve in said second bore, second passage means subjecting said pressure compensator valve to fluid pressure at opposite sides of said annular opening whereby said pressure compensator valve controls the fluid inlet passage means to maintain a nearly constant pressure drop across the annular opening, and pilot pressure setting means to set the pilot pressure at a desired value to position the feed spool for a desired rate of fluid flow including a solenoid operated valve with the last mentioned valve increasing pilot pressure proportional to energization of the solenoid, said rate spring means increasing in resistance in direct proportion to the reduction in length thereof whereby each value of pilot pressure gives a known positioning of the feed spool for a particular rate of flow.
Claim 3
Dependent Claim
97 words
A pressure compensated flow control valve comprising an adjustable feed spool settable to establish an opening of the desired size for the desired rate of flow and urged in one direction by rate spring means, a pressure compensator valve for maintaining a nearly constant pressure drop across said opening, and remotely operable power means working against said rate spring means for positioning said feed spool to set the desired rate of flow, said power means including an electrically controlled valve for setting a pilot pressure acting on said feed spool in opposition to said rate spring means.
Claim 4
Dependent Claim
97 words
A pressure compensated flow control valve comprising an adjustable feed spool settable to establish an opening of the desired size for the desired rate of flow and urged in one direction by rate spring means, a pressure compensator valve for maintaining a nearly constant pressure drop across said opening, and remotely operable power means working against said rate spring means for positioning said feed spool to set the desired rate of flow, said power means including an electrically controlled valve for setting a pilot pressure acting on said feed spool in opposition to said rate spring means.
Claim 5
Dependent Claim
134 words
A flow control valve comprising, a body with a bore, a feed spool positioned in said bore and coacting with a portion thereof to define an opening therebetween for a controlled rate of flow therethrough with the size of the opening variable by the relative position of the spool in the bore, rate spring means in said bore urging said feed spool in one direction, a pilot chamber at an end of said bore to receive pilot pressure fluid acting on said feed spool in opposed relation to said rate spring means, variable means for establishing a pilot pressure to position the feed spool for the desired rate of flow, and a pressure compensator valve responsive to pressure at opposite sides of said opening to maintain a nearly constant pressure drop across the opening.
Claim 6
Dependent Claim
134 words
A flow control valve comprising, a body with a bore, a feed spool positioned in said bore and coacting with a portion thereof to define an opening therebetween for a controlled rate of flow therethrough with the size of the opening variable by the relative position of the spool in the bore, rate spring means in said bore urging said feed spool in one direction, a pilot chamber at an end of said bore to receive pilot pressure fluid acting on said feed spool in opposed relation to said rate spring means, variable means for establishing a pilot pressure to position the feed spool for the desired rate of flow, and a pressure compensator valve responsive to pressure at opposite sides of said opening to maintain a nearly constant pressure drop across the opening.
Claim 7
Dependent Claim
36 words
A flow control valve as defined in claim 3 with passages in said body providing for utilization of the flow control valve to either meter out or meter in fluid flow relative to a fluid motor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |