Patent US3677295A successfully refreshed from Google Patents.
US3677295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional valve control
Assignee: Enerpac Tool Group Corp
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Filing: 1971-02-01
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Granted: 1972-07-18
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Expires: 1991-02-01
Abstract
Abstract A directional control valve having a valve body with four ports equally spaced around a common axis, a wide land seal assembly in diametrically opposite ports and a movable valve disc mounted for rotary motion on one face of the valve body, the valve disc includes a pair of passages having openings positioned to engage the ports, check valves are provided in each of the passages to limit fluid flow to one direction through the passages, and a central passage for bypassing fluid through the valve body. The wide land seal assemblies each include a metal seal disc having a tapered flange on one side and a resilient sleeve bonded to the flange to seal the assembly in the port and to bias the metallic disc against the valve disc.
Inventors
- 👤 John R Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:01
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/072; F16K11/074; F16K11/0743; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/87169; Y10T137/87177
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
255 words
A directional control valve including a valve body having a number of ports terminating on a common surface, a wide land seal assembly in at least one of said ports projecting above said surface, a bonnet sealingly mounted on said common surface of said valve body and including a recess, a valve disc mounted for rotary motion in said recess and including a first passage having an opening at each end, means in said passage for limiting the flow of fluid to one direction through said passage, means for rotating said valve disc to selectively connect one of the openings in said passage to the port having the wide land seal assembly and the other of said opening to another of the ports in said valve body, a second wide land seal assembly in said another of the ports and projecting above said surface, a second passage in said valve disc having openings at each end, means in said second passage for limiting the flow of fluid to one direction through said second passage, one of said openings in said second passage being connected to the port having the second wide land seal assembly when the first passage is aligned with the port having the first wide land seal assembly, each of said seal assemblies including a metallic disc having a central opening and a tapered cylindrical flange around said opening and resilient means bonded to said flange to sealingly engage said port and to bias said metallic disc into engagement with said valve disc.
Claim 2
Dependent Claim
255 words
A directional control valve including a valve body having a number of ports terminating on a common surface, a wide land seal assembly in at least one of said ports projecting above said surface, a bonnet sealingly mounted on said common surface of said valve body and including a recess, a valve disc mounted for rotary motion in said recess and including a first passage having an opening at each end, means in said passage for limiting the flow of fluid to one direction through said passage, means for rotating said valve disc to selectively connect one of the openings in said passage to the port having the wide land seal assembly and the other of said opening to another of the ports in said valve body, a second wide land seal assembly in said another of the ports and projecting above said surface, a second passage in said valve disc having openings at each end, means in said second passage for limiting the flow of fluid to one direction through said second passage, one of said openings in said second passage being connected to the port having the second wide land seal assembly when the first passage is aligned with the port having the first wide land seal assembly, each of said seal assemblies including a metallic disc having a central opening and a tapered cylindrical flange around said opening and resilient means bonded to said flange to sealingly engage said port and to bias said metallic disc into engagement with said valve disc.
Claim 3
Dependent Claim
250 words
A directional control valve for controlling the flow of high pressure hydraulic fluid from a source of high pressure fluid to a hydraulic double acting device or to a reservoir, the valve comprising, a valve body having an inlet port connected to said source, an outlet port connected to said reservoir, and first and second connecting ports connected to said device, a wide land seal assembly in each of said first and second ports, a bonnet sealingly mounted on said body and having a recess therein enclosing said ports, and a valve disc mounted for rotary motion within said recess, said valve disc having a neUtral passage extending through the axis of said disc and first and second passages on each side of said neutral passage, said first and second passages each having openings therein, means within each of said passages for limiting fluid flow to one direction through said passages, and means for rotating said valve disc to selectively connect said inlet port to an opening in one of said passages and said outlet port to one of the openings in the other of said passages, the other opening in each of said passages being connected to one of said first and second ports, each of said wide land seal assemblies including a metallic disc having a central opening and a depending flange around said opening and a resilient sleeve bonded to said flange to sealingly engage said port and to bias said metal disc toward said valve disc.
Claim 4
Dependent Claim
250 words
A directional control valve for controlling the flow of high pressure hydraulic fluid from a source of high pressure fluid to a hydraulic double acting device or to a reservoir, the valve comprising, a valve body having an inlet port connected to said source, an outlet port connected to said reservoir, and first and second connecting ports connected to said device, a wide land seal assembly in each of said first and second ports, a bonnet sealingly mounted on said body and having a recess therein enclosing said ports, and a valve disc mounted for rotary motion within said recess, said valve disc having a neUtral passage extending through the axis of said disc and first and second passages on each side of said neutral passage, said first and second passages each having openings therein, means within each of said passages for limiting fluid flow to one direction through said passages, and means for rotating said valve disc to selectively connect said inlet port to an opening in one of said passages and said outlet port to one of the openings in the other of said passages, the other opening in each of said passages being connected to one of said first and second ports, each of said wide land seal assemblies including a metallic disc having a central opening and a depending flange around said opening and a resilient sleeve bonded to said flange to sealingly engage said port and to bias said metal disc toward said valve disc.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |