US3774635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Vickers Inc
•
Filing: 1972-04-18
•
Granted: 1973-11-27
•
Expires: 1992-04-18
Abstract
Abstract A directional valve for a hydraulic power system has a body adapted to be clamped into a bank of valves and has a spool slidable within the body to direct fluid flow between a pressure fluid source and a hydraulic motor. The body includes auxiliary valves such as a load compensating flow regulator, a load-drop check valve, a cylinder port relief valve, and a cylinder port anti-cavitation valve and the spool includes one or more counterbalance valves. Load sensing passages in the body direct load pressure to the compensator valve and to the pressure source for controlling the volume of fluid delivered from the source. The body is designed for maximum symmetry with the spool bore near the middle of the iron mass to minimize distortions caused by aging of the iron by temperature differences and by the pressure force of the fluid.
Inventors
- 👤 R Farrell
- 👤 C Binkley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:47
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/161; F15B11/163; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; F15B13/06; F15B13/08; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/3053; F15B2211/30535; F15B2211/3055; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/50536; F15B2211/515; F15B2211/5157; F15B2211/5159; F15B2211/55; F15B2211/57; F15B2211/70; F15B2211/71; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702; Y10T137/87169; Y10T137/87177; Y10T137/877; Y10T137/87829; Y10T137/87837; Y10T137/87845; Y10T137/87885; Y10T137/87917; Y10T137/88054
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
203 words
A hydraulic valve unit comprising a generally rectangular body having a spool bore extending from end to end of the rectangle and lying substantially mid-way between its sides, the body having a thickness approximately double the spool bore diameter, a supply port traversing the body thickness and lying mid-way between the ends of the body, a pair of holes to receive clamping bolts traversing the body thickness and spaced from the supply port toward the ends of the body, a pair of exhaust ports traversing the body thickness and spaced from said holes toward the ends of the body, the supply port, the bolt receiving holes, and the exhaust ports lying generally along a line parallel to and at one side of the spool bore, passages connecting the supply port and the exhaust ports with the spool bore, passages on the other side of the bore extending to that side of the body to constitute service ports, and a flow directing spool slidable in the spool bore, the body having subStantially equal quantities of metal on either side of the spool bore whereby distortion of the bore due to unequal expansion of the metal caused by aging or by temperature rise is minimized.
Claim 2
Dependent Claim
203 words
A hydraulic valve unit comprising a generally rectangular body having a spool bore extending from end to end of the rectangle and lying substantially mid-way between its sides, the body having a thickness approximately double the spool bore diameter, a supply port traversing the body thickness and lying mid-way between the ends of the body, a pair of holes to receive clamping bolts traversing the body thickness and spaced from the supply port toward the ends of the body, a pair of exhaust ports traversing the body thickness and spaced from said holes toward the ends of the body, the supply port, the bolt receiving holes, and the exhaust ports lying generally along a line parallel to and at one side of the spool bore, passages connecting the supply port and the exhaust ports with the spool bore, passages on the other side of the bore extending to that side of the body to constitute service ports, and a flow directing spool slidable in the spool bore, the body having subStantially equal quantities of metal on either side of the spool bore whereby distortion of the bore due to unequal expansion of the metal caused by aging or by temperature rise is minimized.
Claim 3
Dependent Claim
43 words
A valve unit as defined in claim 1 having a pair of sensing passages extending from the spool bore toward the one side of the body, a pressure compensator valve in the supply passage and having an end exposed to the sensing passages.
Claim 4
Dependent Claim
30 words
A valve unit as defined in claim 2 wherein means is provided for communication of only one sensing passage with only one of the service passages at any one time.
Claim 5
Dependent Claim
30 words
A valve unit as defined in claim 1 having a relief valve connecting one of the service ports with an exhaust passage at the other side of the spool bore.
Claim 6
Dependent Claim
30 words
A valve unit as defined in claim 1 having a check valve connecting one of the exhaust passages with the service passage at the other side of the spool bore.
Claim 7
Dependent Claim
39 words
A valve spool as defined in claim 1, the spool being hollow and containing at least one counterbalance valve responsive to supply pressure in one service port to open the other service port to exhaust through the hollow spool.
Claim 8
Dependent Claim
48 words
A valve unit as defined in claim 1, the spool being hollow and containing a pair of counterbalance valves, means on the spool for connecting one counterbalance valve to the supply passage when the spool is shifted and for disconnecting the other counterbalance valve at the same time.
Claim 9
Dependent Claim
107 words
A hydraulic power system including a source of pressure fluid having an element controllable to deliver fluid at a rate determined by the pressure lever in a controlling conduit, and a directional valve for supplying pressure fluid to a load device, the valve comprising a body and a spool slidable therein to direct fluid in one direction or the other to the load device, means in the body for sensing the pressure level at the load device and connected by the controlling conduit to the controllable element of the source, and a flow regulating valve associated with the directional valve and also connected with the sensing means.
Claim 10
Dependent Claim
107 words
A hydraulic power system including a source of pressure fluid having an element controllable to deliver fluid at a rate determined by the pressure lever in a controlling conduit, and a directional valve for supplying pressure fluid to a load device, the valve comprising a body and a spool slidable therein to direct fluid in one direction or the other to the load device, means in the body for sensing the pressure level at the load device and connected by the controlling conduit to the controllable element of the source, and a flow regulating valve associated with the directional valve and also connected with the sensing means.
Claim 11
Dependent Claim
46 words
A power system as defined in claim 8 including a second directional valve having a flow regulating valve connected with the sensing means, and valves in the sensing means for isolating the pressure level at the load device which is lower from that which is higher.
Claim 12
Dependent Claim
38 words
A power system as defined in claim 8 wherein the sensing means includes an individual check valve in each directional valve for isolating the pressure level at the load device which is lower from that which is higher.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |