Patent US1625871A successfully refreshed from Google Patents.
Patent US3565110A successfully refreshed from Google Patents.
US3565110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valves
Assignee: Commercial Shearing Inc
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Filing: 1969-08-04
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Granted: 1971-02-23
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Expires: 1989-08-04
Abstract
Abstract A pressure-compensated directional control valve capable of supplying a constant volume of fluid is provided having a directional control valve with inlet and outlet ports and first and second motor ports for connection to opposite sides of a fluid motor, a pressure-compensating valve having an axial bore, an inlet port connected to the inlet port of the control valve, an outlet port connected to the outlet port of the control valve, a pressure-sensing port, a valve member movable in the bore and biased to a position normally blocking the inlet from the outlet port, said valve member having opposite surfaces thereon exposed respectively to the fluid pressure at said inlet port and to fluid pressure at said pressure-sensing port acting with the biasing means and being movable in response to a fluid pressure differential between its inlet port and pressure sensing port through the directional control valve to connect said inlet port to said outlet port for bypassing fluid from said directional control valve to thereby regulate the input flow through said directional control valve to a work port.
Inventors
- 👤 Robert F Hodgson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:34
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0402; F15B13/0403; F15B13/0416; F15B13/0417; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7792; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702; Y10T137/86718; Y10T137/86734; Y10T137/87169; Y10T137/87177
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A pressure-compensated directional control valve comprising a directional control valve for selectively operating a fluid motor at controlled speed, said valve having inlet and outlet ports and first and second motor ports for connection to opposite sides of a fluid motor, a pressure compensating valve having an axial bore, an inlet port connected to the inlet port of said control valve, an outlet port connected to the outlet port of said control valve, a pressure sensing port, a valve member movable in said axial bore, means biasing said valve member to a position normally blocking said outlet from said inlet port, said valve member having opposite surfaces thereon exposed respectively to fluid pressure from said inlet port and to fluid pressure at said pressure-sensing port acting with said biasing means, said valve member being movable in response to fluid pressure differential between its inlet port and pressure-sensing port through the directional control valve to connect said inlet and outlet ports for bypassing input pressure fluid to thereby regulate the input flow through said directional control valve to one of said work ports.
Claim 2
Dependent Claim
182 words
A pressure-compensated directional control valve comprising a directional control valve for selectively operating a fluid motor at controlled speed, said valve having inlet and outlet ports and first and second motor ports for connection to opposite sides of a fluid motor, a pressure compensating valve having an axial bore, an inlet port connected to the inlet port of said control valve, an outlet port connected to the outlet port of said control valve, a pressure sensing port, a valve member movable in said axial bore, means biasing said valve member to a position normally blocking said outlet from said inlet port, said valve member having opposite surfaces thereon exposed respectively to fluid pressure from said inlet port and to fluid pressure at said pressure-sensing port acting with said biasing means, said valve member being movable in response to fluid pressure differential between its inlet port and pressure-sensing port through the directional control valve to connect said inlet and outlet ports for bypassing input pressure fluid to thereby regulate the input flow through said directional control valve to one of said work ports.
Claim 3
Dependent Claim
63 words
A control valve as claimed in claim 1 wherein the directional control valve is provided with a valve member movable in a bore therein, said valve member being hollow at each end to form chambers therein adapted selectively to communicate through the valve member walls with the inlet port, work ports and outlet port and the pressure-sensing port of the pressure compensating valve.
Claim 4
Dependent Claim
41 words
A control valve as claimed in claim 2 wherein said directional control valve member communicates with the pressure-sensing port through a passageway between the two chambers in the neutral position and through a passageway in each chamber in each work position.
Claim 5
Dependent Claim
26 words
A control valve as claimed in claim 3 wherein the passageways in each chamber communicate with the outlet port when the valve is in neutral position.
Claim 6
Dependent Claim
67 words
A control valve as claimed in claim 1 wherein the pressure-compensating valve member is hollow and open at one end, said hollow portion communicating with the inlet port of both the directional control valve and the pressure compensating valve through openings in the sidewalls and discharging through its open end to the outlet port when the pressure in the chamber exceeds the biasing means and pressure-sensing pressures.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |