US3799200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow and pressure regulating control for hydraulic motors
Assignee: Gardner Denver Inc
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Filing: 1972-06-12
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Granted: 1974-03-26
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Expires: 1992-06-12
Abstract
Abstract A hydraulic flow and pressure regulator control comprising a spool type valve which is self-centering and blocks a hydraulic fluid supply port in the centered position. Opposite ends of the valve spool are disposed in opposed chambers which are operable to receive pilot pressure fluid and fluid from the working discharge port of the valve, respectively. Shuttle valves disposed in the spool and the opposed chambers provide for reversible operation of the spool valve. The pressure regulator spool valve is operated to control flow, direction of flow, and pressure by a pressure differential control valve which can be manually operated to supply fluid at variable pressure to either of the opposed chambers. The flow and pressure regulator control is particularly adaptable for control of hydraulic feed or pulldown mechanisms for rock drills.
Inventors
- 👤 J Tipton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:10
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0402; F15B13/0403; E; E21; E21B; E21B19/00; E21B19/08; E21B19/084; E21B19/086; E21B44/00; E21B44/02; E21B44/06; F15B13/042; F15B13/0422; F16; F16H; F16H3/00; F16H3/02; F16H3/20; F16H3/38; F16H3/385; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
203 words
A fluid flow and pressure regulating control valve comprising: a housing including a fluid supply port and first and second ports for conducting fluid to and from said valve; a valve closure member disposed in said housing and movable to alternately place said supply port in communication with said first or second ports; pressure fluid operated means including opposed chambers in said valve housing and actuating means disposed in each of said chambers and responsive to pilot pressure fluid from a source admitted to one of said chambers to move said closure member to place said supply port in communication with one of said first and second ports; and, means responsive to a predetermined pressure in said one port for communicating pressure fluid to the other of said opposed chambers from said one port and for blocking the communication of pilot fluid to said other opposed chamber to cause said actuating means in said other opposed chamber to move said closure member to regulate the pressure of fluid supplied to said one port, said means comprising shiftable valve means including opposed first and second pressure surfaces in communication with said one port and with pressure fluid from a pilot pressure fluid source, respectively.
Claim 2
Dependent Claim
203 words
A fluid flow and pressure regulating control valve comprising: a housing including a fluid supply port and first and second ports for conducting fluid to and from said valve; a valve closure member disposed in said housing and movable to alternately place said supply port in communication with said first or second ports; pressure fluid operated means including opposed chambers in said valve housing and actuating means disposed in each of said chambers and responsive to pilot pressure fluid from a source admitted to one of said chambers to move said closure member to place said supply port in communication with one of said first and second ports; and, means responsive to a predetermined pressure in said one port for communicating pressure fluid to the other of said opposed chambers from said one port and for blocking the communication of pilot fluid to said other opposed chamber to cause said actuating means in said other opposed chamber to move said closure member to regulate the pressure of fluid supplied to said one port, said means comprising shiftable valve means including opposed first and second pressure surfaces in communication with said one port and with pressure fluid from a pilot pressure fluid source, respectively.
Claim 3
Dependent Claim
36 words
The invention set forth in claim 1 wherein: saId shiftable valve means comprises a pair of valve elements engaged with said closure member for movement with said closure member and with respect to said closure member.
Claim 4
Dependent Claim
21 words
The invention set forth in claim 2 wherein: said closure member comprises a cylindrical spool reciprocably disposed in said valve housing.
Claim 5
Dependent Claim
28 words
The invention set forth in claim 3 wherein: said actuating means comprises opposed pressure surfaces on said spool in communication with said opposed chambers in said valve, respectively.
Claim 6
Dependent Claim
25 words
The invention set forth in claim 3 wherein: said valve includes third and fourth ports in said housing for conducting pressure fluid from said valve.
Claim 7
Dependent Claim
84 words
The invention set forth in claim 3 wherein: said valve includes opposed chambers in said spool operable to be in communication, respectively, with said first and second ports, said valve elements are movably disposed in said opposed chambers in said spool, and each of said valve elements is movable in response to pressure fluid from one of said first and second ports acting thereon to move to conduct pressure fluid from said one port to one of said opposed chambers in said valve housing.
Claim 8
Dependent Claim
104 words
The invention set forth in claim 6 together with: a pilot pressure fluid control valve, and conduit means for conducting pilot pressure fluid to said opposed chambers in said valve to act on said opposed pressure surfaces on said spool and on said second pressure surfaces on said movable valve elements, said pilot pressure control valve being operable to valve pilot pressure fluid to one of said opposed chambers in said valve at a pressure greater than supplied to said other opposed chamber whereby said spool is moved to communicate pressure fluid from said supply port to one of said first and second ports.
Claim 9
Dependent Claim
87 words
The invention set forth in claim 7 wherein: one of said valve elements operates to block the communication of pilot pressure fluid to said other opposed chamber in said valve in response to movement of said spool and to block the communication of pressure fluid from said one port to said other chamber as long as a pressure fluid force acting on said first surface of said one valve element is less than a pressure fluid force acting on said second surface of said one valve element.
Claim 10
Dependent Claim
185 words
A fluid flow and pressure regulating control valve comprising: a housing including a fluid supply port and first and second ports for conducting fluid to and from said valve; a valve closure member disposed in said housing and movable to alternately place said supply port in communication with said first or second ports; pressure fluid operated means including opposed chambers in said valve housing and actuating means disposed in each of said chambers and responsive to pilot pressure fluid from a source admitted to one of said chambers to move said closure member to place said supply port in communication with one of said first and second ports; and, means comprising movable valve means movable in response to a predetermined pressure in said one port for communicating pressure fluid to the other of said opposed chambers from said one port and for blocking the communication of pilot fluid to said other opposed chamber to cause said actuating means in said other opposed chamber to move said closure member in opposition to the movement caused by the admission of pilot pressure fluid to said one chamber.
Claim 11
Dependent Claim
185 words
A fluid flow and pressure regulating control valve comprising: a housing including a fluid supply port and first and second ports for conducting fluid to and from said valve; a valve closure member disposed in said housing and movable to alternately place said supply port in communication with said first or second ports; pressure fluid operated means including opposed chambers in said valve housing and actuating means disposed in each of said chambers and responsive to pilot pressure fluid from a source admitted to one of said chambers to move said closure member to place said supply port in communication with one of said first and second ports; and, means comprising movable valve means movable in response to a predetermined pressure in said one port for communicating pressure fluid to the other of said opposed chambers from said one port and for blocking the communication of pilot fluid to said other opposed chamber to cause said actuating means in said other opposed chamber to move said closure member in opposition to the movement caused by the admission of pilot pressure fluid to said one chamber.
Claim 12
Dependent Claim
69 words
The invention set forth in claim 9 wherein: said closure member includes a passage for communicating said first port with one of said opposed chambers and a passage for communicating said second port with the other of said opposed chambers, and said movable valve means comprises a pair of valve elements disposed in said respective passages and cooperable with said closure member for movement between open and closed positions.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |