Patent US2366199A successfully refreshed from Google Patents.
Patent US3765454A successfully refreshed from Google Patents.
US3765454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure graduated control valve
Assignee: Fiat Allis Europe SpA
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Filing: 1973-02-01
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Granted: 1973-10-16
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Expires: 1993-02-01
Abstract
Abstract An axial slot with enlarged end openings is formed in a valve spool of a control valve having inlet, service and exhaust ports spaced axially along the valve spool bore. The axial slot always communicates with the service port and extends axially a sufficient distance to permit communication between all three ports as the valve spool is moved from its closed position to its open position. In the closed position one end of the slot is blocked and the other opens into the exhaust port. In the open position said one end of the slot is open to the inlet port and the other end of the slot is blocked from communication with the exhaust port. The valve provides rapid pressure rises in the service port during initial and final movements of the spool from its closed position to its open position.
Inventors
- 👤 D Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:47
CPC Classifications
B; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/10; B62D11/14; B62D11/18; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702; Y10T137/8671; Y10T137/86718; Y10T137/86734
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
177 words
A control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction from said inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by: a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having an axially extending slot in its periphery in communication with said service port, and first and second enlarged peripheral openings in said slot at its opposite axial ends, respectively, said first opening being blocked by said first bore land and said second opening being in full free flow communication with said exhaust port when said spool is in its closed position, said first opening being in full free flow communication with said inlet port and said second opening being blocked by said second bore land when said spool is in its open position.
Claim 2
Dependent Claim
177 words
A control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction from said inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by: a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having an axially extending slot in its periphery in communication with said service port, and first and second enlarged peripheral openings in said slot at its opposite axial ends, respectively, said first opening being blocked by said first bore land and said second opening being in full free flow communication with said exhaust port when said spool is in its closed position, said first opening being in full free flow communication with said inlet port and said second opening being blocked by said second bore land when said spool is in its open position.
Claim 3
Dependent Claim
22 words
The valve of claim 1 and further characterized by an annular recess in said spool between and spaced axially from said openings.
Claim 4
Dependent Claim
29 words
The valve of claim 2 wherein said recess communicates directly only with said service port and said recess is in fluid communication with said openings only through said slot.
Claim 5
Dependent Claim
33 words
The valve of claim 1 wherein said openings are annular and extend transversely relative to the axis of said spool, the diameter of said openings being greater than the width of said slot.
Claim 6
Dependent Claim
13 words
The valve of claim 4 wherein said openings extend transversely through said spool.
Claim 7
Dependent Claim
36 words
The valve of claim 5 and further characterized by another slot on the diametrically opposite side of said spool from said first mentioned slot and extending axially between and in free flow communication with said openings.
Claim 8
Dependent Claim
197 words
A control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction from said inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by: a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having, an axially extending slot in its periphery in communication with said service port, said slot being blocked from communication with said inlet port by said first bore land and said slot being in full fRee flow communication with said exhaust port when said spool is in its closed position, said slot being in full free flow communication with said inlet port and said slot being blocked from communication with said exhaust port by said second bore land when said spool is in its open position, said slot being in fluid communication with all said ports during a major part of the movement of said spool from said closed position to said open position.
Claim 9
Dependent Claim
197 words
A control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction from said inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by: a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having, an axially extending slot in its periphery in communication with said service port, said slot being blocked from communication with said inlet port by said first bore land and said slot being in full fRee flow communication with said exhaust port when said spool is in its closed position, said slot being in full free flow communication with said inlet port and said slot being blocked from communication with said exhaust port by said second bore land when said spool is in its open position, said slot being in fluid communication with all said ports during a major part of the movement of said spool from said closed position to said open position.
Claim 10
Dependent Claim
23 words
The valve of claim 7 and further characterized by an annular recess in said spool intermediate the axially opposite ends of said slot.
Claim 11
Dependent Claim
32 words
The valve of claim 8 wherein said recess communicates directly only with said service port and said recess is in fluid communication with said inlet and exhaust ports only through said slot.
Claim 12
Dependent Claim
170 words
A control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction from said inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by: a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having a pair of axially extending slots in its periphery in communication with said service port, said slots being blocked from communication with said inlet port by said first bore land and one of said slots being in communication with said exhaust port when said spool is in its closed position, the other of said slots being in communication with said inlet port and one slot being blocked from communication with said exhaust port by said second bore land when said spool is in its open position.
Claim 13
Dependent Claim
170 words
A control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction from said inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by: a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having a pair of axially extending slots in its periphery in communication with said service port, said slots being blocked from communication with said inlet port by said first bore land and one of said slots being in communication with said exhaust port when said spool is in its closed position, the other of said slots being in communication with said inlet port and one slot being blocked from communication with said exhaust port by said second bore land when said spool is in its open position.
Claim 14
Dependent Claim
33 words
The valve of claim 10 wherein said one slot is enlarged at its axial end nearest said inlet port and said other slot is enlarged at its axial end nearest said exhaust port.
Claim 15
Dependent Claim
76 words
The valve of claim 11 and further comprising an annular recess formed in said spool between said axial ends of said slots and wherein said slots open into said recess, said recess being in direct communication with said service port in all positions of said spool and said recess having communication with said inlet and outlet ports in the open and closed positions of said spool, respectively, by way of said one and other slots, respectively.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |