US3592216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control valve
Assignee: Borg Warner Corp
•
Filing: 1968-09-06
•
Granted: 1971-07-13
•
Expires: 1988-09-06
Abstract
Abstract A flow control valve for use with a manual control valve controlling a hydraulic motor, the flow control valve having a piston therein having a variable orifice and an optional fixed orifice connected between the variable orifice and the inlet of the manual valve. The flow control valve is controlled by a variable orifice established by the manual valve between the inlet to the manual valve and an outlet port of the manual valve connected to the hydraulic motor. The flow control valve includes a pressure chamber connectable to the load-actuating pressure of the manual valve whereby the variable orifice will be sized to provide a pressure in accordance with the work port pressure and the optional fixed orifice providing a maximum flow limit for the control valve. An orifice is provided in the connection between the work ports and the pressure chamber of the flow control valve and the pressure chamber is further connected to a relief valve whereby when the relief valve is open the pressure in the pressure chamber will be stabilized allowing movement of the flow control valve to limit the pressure supplied to the manual valve when the load-actuating pressure exceeds the predetermined maximum pressure limit of the manual control valve whereby a maximum pressure value is established for the hydraulic motor.
Inventors
- 👤 Kenneth G Mcmillen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:17
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/161; F15B11/162; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/25; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/35; F15B2211/351; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50536; F15B2211/57; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6052; F15B2211/6054; F15B2211/6055; F15B2211/70; F15B2211/71; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/2605; Y10T137/2612
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
314 words
A control valve working section including a control valve and a flow control valve that are operatively interconnected for controlling the flow of fluid from a source of pressure to a fluid-actuated device, said control valve having a pressure inlet port, an exhaust port, first and second motor ports adapted to be connected to said fluid-actuated device, and a valving element movable from a neutral position to first and second operating positions for controlling fluid communication between said ports by establishing a variable orifice therebetween; said flow control valve having an input port, an output port, a bore intersecting said input port and said output port, and a piston in said bore effective to control fluid communication between said input port and said output port and being movable to a position restricting flow therebetween and also being effective to divide said bore into first and second fluid-responsive chambers, and bias force means opposing the movement of said piston to said flow-restricting position; conduit means interconnecting said output port of said flow control valve to said inlet port of said control valve and said output port of said flow control valve being in communication with the one of said fluid-responsive chambers that is effective to move said piston to a flow-restricting position; logic means effective to connect the other of said chambers to whichever motor port is in fluid communication with said inlet port of said control valve; whereby said piston is moved to said flow-restricting position by the difference between the fluid pressure in said output port and whichever motor port is connected to said inlet port whenever one of said motor ports is connected to said inlet port so that said flow control valve is responsive to the variable area established by said movable valving element and to the flow and pressure drop from said inlet port to either of said motor ports.
Claim 2
Dependent Claim
314 words
A control valve working section including a control valve and a flow control valve that are operatively interconnected for controlling the flow of fluid from a source of pressure to a fluid-actuated device, said control valve having a pressure inlet port, an exhaust port, first and second motor ports adapted to be connected to said fluid-actuated device, and a valving element movable from a neutral position to first and second operating positions for controlling fluid communication between said ports by establishing a variable orifice therebetween; said flow control valve having an input port, an output port, a bore intersecting said input port and said output port, and a piston in said bore effective to control fluid communication between said input port and said output port and being movable to a position restricting flow therebetween and also being effective to divide said bore into first and second fluid-responsive chambers, and bias force means opposing the movement of said piston to said flow-restricting position; conduit means interconnecting said output port of said flow control valve to said inlet port of said control valve and said output port of said flow control valve being in communication with the one of said fluid-responsive chambers that is effective to move said piston to a flow-restricting position; logic means effective to connect the other of said chambers to whichever motor port is in fluid communication with said inlet port of said control valve; whereby said piston is moved to said flow-restricting position by the difference between the fluid pressure in said output port and whichever motor port is connected to said inlet port whenever one of said motor ports is connected to said inlet port so that said flow control valve is responsive to the variable area established by said movable valving element and to the flow and pressure drop from said inlet port to either of said motor ports.
Claim 3
Dependent Claim
66 words
The control valve working section as claimed in claim 1 in which said logic means includes a control port in said control valve, conduit means connecting said control port to said other chamber, and said valving element cooperates with said control port by connecting one of said motor ports to said control port when said valving element connects said one motor port to said inlet port.
Claim 4
Dependent Claim
67 words
The control valve working section in claim 1 in which said logic means includes two control ports in said control valve, conduit means connecting said control ports to said other chamber, and said valving element cooperates with said control ports by connecting one of said control ports to one of said motor ports whenever said valving element connects either of said motor ports to said inlet port.
Claim 5
Dependent Claim
29 words
The control valve working section as claimed in claim 3 in which said controL ports are interposed between said inlet port and said motor ports of said control valve.
Claim 6
Dependent Claim
60 words
The control valve working section as claimed in claim 3 in which said logic means includes fluid-actuated valve means having two control signal inlet ports, and a control signal outlet port, and said conduit means interconnects said control signal inlet ports to said control ports and said control signal outlet port to said other chamber of said flow control valve.
Claim 7
Dependent Claim
21 words
The control valve working section as claimed in claim 5 in which said fluid-activated valve means comprises a three-port shuttle valve.
Claim 8
Dependent Claim
24 words
The control valve working section as claimed in claim 1 including an additional means to restrict communication between said input and said output port.
Claim 9
Dependent Claim
65 words
A control valve working section as claimed in claim 7 wherein said additional means comprises pressure-responsive means connecting said other chamber and said exhaust port and operative to limit the pressure in said other chamber, whereby a pressure in said input port and in said one chamber exceeding said limited pressure in said other chamber is effective to move said piston to said flow-restricting position.
Claim 10
Dependent Claim
19 words
A flow control valve working section as claimed in claim 8 wherein said pressure-responsive means comprises a relief valve.
Claim 11
Dependent Claim
123 words
A control valve working section as claimed in claim 7 in which said additional means comprises; a load check position to which said piston is movable by said bias means acting on said piston, means associated with said piston to connect said one chamber to said input port and to isolate said one chamber from said output port, whereby when the pressure in whichever motor port is connected to said inlet port is equal to or greater than the pressure at said input port, said bias means and the pressure in said other chamber will act on said piston to move it to said load check position thereby preventing flow from either motor port through said flow control valve toward said input port.
Claim 12
Dependent Claim
23 words
The control valve working section as claimed in claim 10 in which said means associated with said piston comprises a hollow portion thereof.
Claim 13
Dependent Claim
37 words
A control valve working section as claimed in claim 7 wherein said logic means includes at least one control port in said control valve connecting said other chamber to the motor port connected to said inlet port.
Claim 14
Dependent Claim
39 words
A control valve working section as claimed in claim 12 in which said logic means includes a second control port and fluid-actuated poppet means connecting said other chamber to the motor port that is connected to said inlet port.
Claim 15
Dependent Claim
121 words
A control valve working section as claimed in claim 7 wherein said one of said chambers is exposed to the pressure at said inlet port and the fluid pressure in said other chamber is reduced to a low value by said logic means whenever said valving element is in said neutral position, whereby a relatively low value of fluid pressure in said inlet port and said one chamber is effective to move said piston to said flow-restricting position against the combined force of said bias force means and said low value of pressure in said other chamber so that said inlet port is isolated from the fluid pressure in said input port whenever said valving element is in said neutral position.
Claim 16
Dependent Claim
66 words
A control valve working section as claimed in claim 14 in which said logic means includes flow paths established and blocked by said valving element, and said valving element cooperates in the establishing of a flow path from said other chamber to said exhaust port to achieve said low value of fluid pressure in said other chamber when said valving element is in said neutral position.
Claim 17
Dependent Claim
92 words
A control valve working section as claimed in claim 10 in which said flow control valve includes a bypass position in which said piston moves further into said other chamber than for flow-restricting position, and said piston is effective in said bypass position to establish a fluid communication path from said output poRt to a conduit communicating with said exhaust port, whereby the pressure in said output port is limited to that which is necessary to move said piston to said bypass position whenever said valving element is in said neutral position.
Claim 18
Dependent Claim
100 words
A control valve working section as claimed in claim 7 in which said logic means includes two control ports associated with said control valve and a three port shuttle valve interconnecting said two control ports and said other chamber. 18 A control valve working section as claimed in claim 17 wherein said connection between said other chamber and a motor port includes a pair of pressure-responsive surfaces on said piston, being effective when said valving element is moved to its neutral position to control the pressure in said other chamber whereby said piston will be moved to a flow-restricting position.
Claim 19
Dependent Claim
53 words
A control valve working section as in claim 18 in which said flow control valve piston has a bypass position in which said output port is placed in communication with said exhaust port, said bypass position being the flow-restricting position of said piston established when said valving element is in said neutral position.
Claim 20
Dependent Claim
45 words
A control valve working section as claimed in claim 17 wherein said additional means includes pressure-responsive means connected to said other chamber and operative to reduce the pressure in said other chamber in response to the pressure at said motor port exceeding a predetermined value.
Claim 21
Dependent Claim
129 words
A control valve working section as claimed in claim 17 wherein said one chamber is exposed to the pressure in said fluid connection between said source and said inlet port in which said additional means comprises a load check position of said piston to which said piston is movable by said bias means acting on said piston, means associated with said piston to connect said one chamber to said input port and to isolate said one chamber from said output port whereby when the pressure at said motor port is equal to the pressure at said input port, said bias means will act on said piston to move it to said load check position preventing flow from said motor ports through said flow control valve toward said input port.
Claim 22
Dependent Claim
23 words
A control valve working section as claimed in claim 21 in which said means associated with said piston comprises a hollow portion thereof.
Claim 23
Dependent Claim
268 words
A control valve working section including a control valve and a differential pressure sensitive valve that are operatively interconnected for controlling the flow of fluid from a source of pressure to a fluid-actuated device; said control valve having an inlet port, an exhaust port, at least one motor port, a spool bore intersecting said ports, and a valving element movable from a neutral position to first and second operating positions for establishing variable orifice fluid communication between said ports; said differential pressure sensitive valve including an input port, an output port connected to said inlet port of said control valve, a bore intersecting said input port and said output port, and a piston in said bore effective in a first operating position to allow free fluid communication between said input port and said output port and being movable to a second operating position restricting flow therebetween and also being effective to divide said bore into first and second fluid-responsive chambers; means adapted to move said piston to said operating positions including bias means applying a force to said position, and fluid pressure means in one of said chambers, and logic means connecting the other of said fluid-responsive chambers to said motor port in said control valve and being effective to control the fluid pressure in said other chamber as a function of the operating positions of said valving element; whereby when said valving element is in its said neutral position the pressure will be controlled in said other fluid-responsive chamber so that said means adapted to move said piston will move said piston to said second operating position.
Claim 24
Dependent Claim
268 words
A control valve working section including a control valve and a differential pressure sensitive valve that are operatively interconnected for controlling the flow of fluid from a source of pressure to a fluid-actuated device; said control valve having an inlet port, an exhaust port, at least one motor port, a spool bore intersecting said ports, and a valving element movable from a neutral position to first and second operating positions for establishing variable orifice fluid communication between said ports; said differential pressure sensitive valve including an input port, an output port connected to said inlet port of said control valve, a bore intersecting said input port and said output port, and a piston in said bore effective in a first operating position to allow free fluid communication between said input port and said output port and being movable to a second operating position restricting flow therebetween and also being effective to divide said bore into first and second fluid-responsive chambers; means adapted to move said piston to said operating positions including bias means applying a force to said position, and fluid pressure means in one of said chambers, and logic means connecting the other of said fluid-responsive chambers to said motor port in said control valve and being effective to control the fluid pressure in said other chamber as a function of the operating positions of said valving element; whereby when said valving element is in its said neutral position the pressure will be controlled in said other fluid-responsive chamber so that said means adapted to move said piston will move said piston to said second operating position.
Claim 25
Dependent Claim
94 words
A control valve working section as claimed in claim 23 wherein said bias means applies a force moving said piston toward said first operating position, conduit means connecting said output port and the one fluid-responsive chamber that is effective to move said piston to second operating position, and said logic means is effective to connect said other fluid-responsive chamber to said motor port when said valving element is in said first operating position and effective to connect said other fluid-responsive chamber to said exhaust port when said valving element is in said neutral position.
Claim 26
Dependent Claim
63 words
A control mechanism as claimed in claim 24 wherein pressure-responsive means is provided connected to said other fluid-responsive chamber whereby when the pressure at said other chamber exceeds a predetermined amount said pressure-responsive means will be actuated to reduce the pressure in said other chamber whereby said valve member will move to a position to block communication between said input and output ports.
Claim 27
Dependent Claim
15 words
A structure as described in claim 25 wherein said pressure-responsive means comprises a relief valve.
Claim 28
Dependent Claim
121 words
A control valve working section as claimed in claim 21 in which said control valve includes first and second motor ports; said valving element is effective in said first operating position to connect said first motor port to said inlet port, is effective in said second operating position to connect said second motor port to said inlet port, and is effective in said neutral position to isolate said inlet port from both said motor ports; and said logic means is effective to connect said other chamber to whichever motor port is connected to said inlet port and said logic means is also effective to connect said other chamber to said exhaust port whenever said valving element is in said neutral position.
Claim 29
Dependent Claim
88 words
A control valve working section as claimed in claim 27 in which said piston is movable from said first position to a bypass position remote from said first position by fluid pressure in said output port and said one chamber, and said piston is effective in said bypass position to open a communication path between said output port and said exhaust port whereby the fluid pressure in said output port is limited to the value required in said one chamber to actuate said piston to said bypass position.
Claim 30
Dependent Claim
23 words
A control valve working section as claimed in claim 24 in which said logic means includes a control port intersecting said spool bore.
Claim 31
Dependent Claim
88 words
A control valve working section as claimed in claim 24 in which said piston is movable from said first position to a bypass position remote from said first position by fluid pressure in said output port and said one chamber, and said piston is effective in said bypass position to open a communication path between said output port and said exhaust port whereby the fluid pressure in said output port is limited to the valve required in said one chamber to actuate said piston to said bypass position.
Claim 32
Dependent Claim
23 words
A control valve working section as claimed in claim 23 in which said logic means includes a control port intersecting said spool bore.
Claim 33
Dependent Claim
50 words
A control valve working section as claimed in claim 23 in which said piston is movable from said first position to said second operating position and to a bypass position in which said piston opens a bypass path from said output port to a conduit communicating with said exhaust port.
Claim 34
Dependent Claim
159 words
A control valve having an inlet port, a motor port and a movable valve means intersecting said ports; a differential pressure sensitive valve having first and second ports, and a movable valve member having first and second pressure-responsive areas; said movable valve member defining a variable restriction flow path between said first and second ports, said first port being connected to a source of fluid pressure and said second port being connected to said inlet port of said control valve and said first pressure-responsive area; means connecting the motor port of said control valve to said second fluid-responsive area to control the pressure applied thereto and bias means associated with said second fluid-responsive area whereby said movable member moves to block the flow between said first and second ports when said control valve blocks communication between said inlet port and said motor port, whereby said inlet port of said control valve is isolated from said source of fluid pressure.
Claim 35
Dependent Claim
159 words
A control valve having an inlet port, a motor port and a movable valve means intersecting said ports; a differential pressure sensitive valve having first and second ports, and a movable valve member having first and second pressure-responsive areas; said movable valve member defining a variable restriction flow path between said first and second ports, said first port being connected to a source of fluid pressure and said second port being connected to said inlet port of said control valve and said first pressure-responsive area; means connecting the motor port of said control valve to said second fluid-responsive area to control the pressure applied thereto and bias means associated with said second fluid-responsive area whereby said movable member moves to block the flow between said first and second ports when said control valve blocks communication between said inlet port and said motor port, whereby said inlet port of said control valve is isolated from said source of fluid pressure.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |