US3595271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional flow control valve with float and check valve structure
Assignee: Case LLC
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Filing: 1969-06-30
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Granted: 1971-07-27
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Expires: 1989-06-30
Abstract
Abstract An improved directional flow control valve having a housing including an intake port, two motor ports adapted for connection to opposing sides of a hydraulic motor and an exhaust port for return of fluid from the hydraulic ram to the reservoir, the motor ports having check valve means interposed therein which normally preclude the return of fluid from said hydraulic ram to said valve housing, with control means within said valve housing for actuating the check valve means to selectively interconnect the intake port with either of the motor ports or to interconnect said motor parts with each other and the exhaust port to obtain a float condition within the hydraulic ram.
Inventors
- 👤 Vaughn A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:47
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87233; Y10T137/87241
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
An improved directional flow control valve comprising: a. a housing having an intake port and two motor ports adapted for connection to opposing ends of a hydraulic ram and an exhaust port for return of fluid from the hydraulic ram to a reservoir; b. check valve means interposed in said motor ports and said intake port which normally preclude return of fluid from said hydraulic ram to said valve housing; c. control means within said valve housing and effective to actuate said check valve means for selectively interconnecting said intake port with either of said motor ports and the other motor port with an exhaust, or interconnecting said motor ports to obtain a float condition for the hydraulic ram.
Claim 2
Dependent Claim
119 words
An improved directional flow control valve comprising: a. a housing having an intake port and two motor ports adapted for connection to opposing ends of a hydraulic ram and an exhaust port for return of fluid from the hydraulic ram to a reservoir; b. check valve means interposed in said motor ports and said intake port which normally preclude return of fluid from said hydraulic ram to said valve housing; c. control means within said valve housing and effective to actuate said check valve means for selectively interconnecting said intake port with either of said motor ports and the other motor port with an exhaust, or interconnecting said motor ports to obtain a float condition for the hydraulic ram.
Claim 3
Dependent Claim
21 words
An apparatus as defined in claim 1 in which a. said spool means comprises a spool reciprocable within said valve housing.
Claim 4
Dependent Claim
49 words
An apparatus as defined in claim 2 in which said control means comprises check valve-actuating means interposed between said spool and said check valve means for actuation by said spool to achieve interconnection between the intake port and either of said motor ports or interconnection between said motor ports.
Claim 5
Dependent Claim
36 words
An apparatus as defined in claim 3 in which said control means comprises cam surfaces on said spool, and said check valve actuating means comprises reciprocable plungers reciprocated by said cam means to open said valves.
Claim 6
Dependent Claim
140 words
In a directional flow control valve having a housing, an intake port and two motor ports, an exhaust port and a spool within said housing for interconnecting said intake port with one of said motor ports and the other motor port with said exhaust port, the improvement comprising: a. check valve means within said motor ports and exhaust port for normally precluding fluid flow from a hydraulic ram to said valve housing or from said intake port to said spool; b. actuating means interposed between said check valve means and said spool for selectively opening said check valves upon reciprocation of said spool; and c. at least three cam means on said spool whereby flow may be directed from either of said ends of said hydraulic ram to said exhaust port or to interconnect said motor ports and exhaust port.
Claim 7
Dependent Claim
140 words
In a directional flow control valve having a housing, an intake port and two motor ports, an exhaust port and a spool within said housing for interconnecting said intake port with one of said motor ports and the other motor port with said exhaust port, the improvement comprising: a. check valve means within said motor ports and exhaust port for normally precluding fluid flow from a hydraulic ram to said valve housing or from said intake port to said spool; b. actuating means interposed between said check valve means and said spool for selectively opening said check valves upon reciprocation of said spool; and c. at least three cam means on said spool whereby flow may be directed from either of said ends of said hydraulic ram to said exhaust port or to interconnect said motor ports and exhaust port.
Claim 8
Dependent Claim
94 words
An improved directional flow control valve comprising: a. a housing, b. an elongated bore within said housing, c. an intake port two motor ports and an exhaust port on said housing, each having a channel communicating with said elongated bore, d. poppet valve means disposed within said channels for normally precluding fluid flow from said intake and motor ports to said elongated bore, e. spool means reciprocable within said elongated bore, and f. control means disposed between said poppet valve means and said spool for actuating said poppet valves upon reciprocation of said spool.
Claim 9
Dependent Claim
94 words
An improved directional flow control valve comprising: a. a housing, b. an elongated bore within said housing, c. an intake port two motor ports and an exhaust port on said housing, each having a channel communicating with said elongated bore, d. poppet valve means disposed within said channels for normally precluding fluid flow from said intake and motor ports to said elongated bore, e. spool means reciprocable within said elongated bore, and f. control means disposed between said poppet valve means and said spool for actuating said poppet valves upon reciprocation of said spool.
Claim 10
Dependent Claim
44 words
An apparatus as defined in claim 6 in which: a. said control means comprises plunger elements interconnecting said spool and said poppet valves, and b. cam means disposed upon said spool which are effective to reciprocate said plunger elements upon reciprocation of said spool.
Claim 11
Dependent Claim
50 words
An apparatus as defined in claim 7 in which: a. said camming surfaces are so disposed upon said spool so as to selectively actuate the poppet valve in said intake port and the poppet valve in one motor port or to actuate solely said poppet valves in said motor ports.
Claim 12
Dependent Claim
112 words
An improved directional control valve comprising: a. a housing, b. an elongated bore within said housing, c. an intake port, at least one delivery port adapted for connection to a hydraulic ram, and an exhaust port, each port being in communication with said elongated bore, d. poppet valve means disposed within said delivery port and said intake port for normally precluding flow from such ports to said elongated bore, e. spool means reciprocable within said elongated bore, and f. control means disposed between said poppet valve means and said spool for selectively permitting fluid flow from said intake port to said motor port or from said motor port to said exhaust port.
Claim 13
Dependent Claim
112 words
An improved directional control valve comprising: a. a housing, b. an elongated bore within said housing, c. an intake port, at least one delivery port adapted for connection to a hydraulic ram, and an exhaust port, each port being in communication with said elongated bore, d. poppet valve means disposed within said delivery port and said intake port for normally precluding flow from such ports to said elongated bore, e. spool means reciprocable within said elongated bore, and f. control means disposed between said poppet valve means and said spool for selectively permitting fluid flow from said intake port to said motor port or from said motor port to said exhaust port.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |