US3774504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding spool valve
Assignee: Individual
•
Filing: 1972-03-01
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Granted: 1973-11-27
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Expires: 1992-03-01
Abstract
Abstract A valve, particularly useful to control the operation of a single-acting hydraulic cylinder comprises a valve body bored to receive a spool-shaped valve stem adapted to be freely rotatable therein and to be moved longitudinally to effect the operation of the valve. Power fluid is admitted to the valve chamber at the mid-portion of the stem, and power fluid take-off is made from the mid-portion through a ball check valve, which is opened either by the fluid pressure of the incoming fluid or by being engaged by one rim of the spool when the spool is slid forward, this latter position permitting fluid to flow from the take-off line. The spool, when slid in the other direction, seals the discharge line from the valve body, permitting the full pressure of the incoming fluid to be exerted on the check valve. The spool, in its mid-position, permits the valve to constantly discharge and the ball check valve to remain seated and to hold whatever fluid pressure exists in the take-off line.
Inventors
- 👤 R Bonney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:28
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; Y; Y10; Y10S; Y10S137/00; Y10S137/901; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87056; Y10T137/87169; Y10T137/87177; Y10T137/87185; Y10T137/87233; Y10T137/87241
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
A valve comprising: a. a valve body bored to have a cylindrical valve chamber one end of which defines a valve-seat, a discharge conduit therefrom downstream of said valve seat and upstream of said valve seAt an inlet conduit and a power-fluid take-off conduit; b. a cylindrical spool slideably mounted within said valve chamber, extending through said valve seat and having (1) an end downstream of said valve seat adapted to mate and form a seal with said valve-seat when said spool is in a closed position, (2) a mid-portion of smaller diameter, both said inlet conduit and said take-off conduit facing the same when said spool is in a mid-position with said spool end being unseated, and (3) on the other end an enlarged tapered shoulder no larger than the diameter of said end; means for sliding said spool from said mid-position in one direction in said valve chamber to said closed position, and in the other direction to bring said tapered shoulder into the zone of said mid-position; and c. a check valve in said take-off conduit at the end facing said valve chamber, said check valve having a valve member normally biased in the closed position and opening (1) when engaged by said tapered shoulder, and (2) under the pressure of powerfluid in said valve chamber when said spool is in said closed position.
Claim 2
Dependent Claim
227 words
A valve comprising: a. a valve body bored to have a cylindrical valve chamber one end of which defines a valve-seat, a discharge conduit therefrom downstream of said valve seat and upstream of said valve seAt an inlet conduit and a power-fluid take-off conduit; b. a cylindrical spool slideably mounted within said valve chamber, extending through said valve seat and having (1) an end downstream of said valve seat adapted to mate and form a seal with said valve-seat when said spool is in a closed position, (2) a mid-portion of smaller diameter, both said inlet conduit and said take-off conduit facing the same when said spool is in a mid-position with said spool end being unseated, and (3) on the other end an enlarged tapered shoulder no larger than the diameter of said end; means for sliding said spool from said mid-position in one direction in said valve chamber to said closed position, and in the other direction to bring said tapered shoulder into the zone of said mid-position; and c. a check valve in said take-off conduit at the end facing said valve chamber, said check valve having a valve member normally biased in the closed position and opening (1) when engaged by said tapered shoulder, and (2) under the pressure of powerfluid in said valve chamber when said spool is in said closed position.
Claim 3
Dependent Claim
65 words
The valve of claim 1 wherein the opposing cross-sectional areas of the ends of said spool containing power-fluid when said spool is in said closed position are approximately equal and the pressures tending to move said spool in one direction or the other are approximately balanced, the interior diameter of said valve seat being approximately the same as the largest diameter of said valve chamber.
Claim 4
Dependent Claim
33 words
The valve of claim 1 wherein said check-valve is a spring loaded ball check valve, the face of the ball of which extends slightly into said valve chamber and engages said tapered shoulder.
Claim 5
Dependent Claim
50 words
The valve of claim 1 wherein said end of said spool downstream of said valve seat has a radially extending lip of diameter larger than the diameter of said valve chamber, and wherein said valve-seat has a face mating with said lip when said spool is in said closed position.
Claim 6
Dependent Claim
113 words
The valve of claim 1 wherein said means for sliding said spool comprises: d. a valve handle connecting with said spool beyond said tapered shoulder and extending from said falve body along the axis of rotation of said spool; e. means for biasing said spool to return to said mid-position from said closed position; and f. sealing means adapted to prevent the passage of fluid between said valve body and said valve handle; and wherein said spool has an interior passageway adapted to permit fluid to flow from beyond said tapered shoulder into said discharge conduit, and said spool is freely rotatable within said valve chamber without effecting the operation of said valve.
Claim 7
Dependent Claim
27 words
The combination of the valve of claim 1 with a single acting hydraulic cylinder, the inlet of said hydraulic cylinder being connected with said power-fluid take-off conduit.
References Cited (Backward Citations)
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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) | 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 |