US3570517A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for regulating the flow of liquids
Assignee: Bosch Rexroth AG
•
Filing: 1969-07-11
•
Granted: 1971-03-16
•
Expires: 1989-07-11
Abstract
Abstract Apparatus which controls the flow of pressurized liquid between a pump and a reservoir on the one hand and the chambers of a double-acting cylinder on the other hand comprises a pressure reducing valve whose housing accommodates a reciprocable spool which can throttle the flow of liquid in the second of two channels provided in the housing and connected with opposite chambers of the cylinder. The first channel is in permanent communication with an internal chamber of the housing which accommodates one end surface of the spool and a spring which biases the spool to a position in which the spool offers less resistance to the flow of liquid in the second channel. A fourway valve regulates the flow of liquid between the channels of the housing and the pressure source and reservoir. When the pressure of liquid in the first channel rises, such pressure is communicated to the chamber and causes the liquid acting against the end surface of the spool to assist the action of the spring.
Inventors
- 👤 Hubert Odenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:14
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/31; F15B2211/3122; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/50; F15B2211/505; F15B2211/50554; F15B2211/515; F15B2211/5153; F15B2211/52; F15B2211/528; F15B2211/57; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2708; Y10T137/271
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
Apparatus for regulating the flow of a liquid to and from a consuming machine, comprising a source of pressurized liquid; a pressure reducing valve having a housing, a valve member movable in said housing between a plurality of positions, said housing defining a first channel which is at least partially unobstructed in each position of said member and a second channel wherein the flow of liquid is throttled by said member as a function of the position of said member, and biasing means for urging said member in a direction to reduce its throttling action, said member having a surface so positioned that a pressure applied thereagainst causes the member to move in the direction of action of said biasing means and said housing defining a chamber which accommodates said surface and communicates with said first channel; and control valve means having a portion movable between first and second positions in which it respectively connects said source with said first and second channels.
Claim 2
Dependent Claim
163 words
Apparatus for regulating the flow of a liquid to and from a consuming machine, comprising a source of pressurized liquid; a pressure reducing valve having a housing, a valve member movable in said housing between a plurality of positions, said housing defining a first channel which is at least partially unobstructed in each position of said member and a second channel wherein the flow of liquid is throttled by said member as a function of the position of said member, and biasing means for urging said member in a direction to reduce its throttling action, said member having a surface so positioned that a pressure applied thereagainst causes the member to move in the direction of action of said biasing means and said housing defining a chamber which accommodates said surface and communicates with said first channel; and control valve means having a portion movable between first and second positions in which it respectively connects said source with said first and second channels.
Claim 3
Dependent Claim
15 words
Apparatus as defined in claim 1, wherein said control valve means comprises a four-way valve.
Claim 4
Dependent Claim
29 words
Apparatus as defined in claim 1, wherein said surface is an end surface of said valve member and wherein said biasing means comprises spring means accommodated in said chamber.
Claim 5
Dependent Claim
22 words
Apparatus as defined in claim 3, wherein said pressure reducing valve further comprises means for adjusting the bias of said spring means.
Claim 6
Dependent Claim
21 words
Apparatus as defined in claim 1, wherein said housing is provided with a bore connecting said chamber with said first passage.
Claim 7
Dependent Claim
29 words
Apparatus as defined in claim 1, wherein said valve member comprises a spool which is reciprocable in said housing and wherein said first channel extends transversely of said spool.
Claim 8
Dependent Claim
54 words
Apparatus as defined in claim 1, wherein said valve member has a second surface so positioned that a pressure applied thereagainst tends to move the valve member counter to the direction of action of said biasing means, said housing having a second chamber which communicates with said second channel and accommodates said second suRface.
Claim 9
Dependent Claim
27 words
Apparatus as defined in claim 7, wherein said second chamber communicates with said second channel by way of at least one bore provided in said valve member.
Claim 10
Dependent Claim
30 words
Apparatus as defined in claim 1, wherein said portion of said control valve means is further movable to a third position in which both said channels communicate with said source.
Claim 11
Dependent Claim
103 words
Apparatus as defined in claim 1, wherein said housing is a flat panel and is provided with a pair of passages one of which connects said source with said control valve means and the other of which connects said control valve means with a reservoir, said portion of said control valve means connecting said other passage with said second channel in the first position thereof and with said first channel in the second position thereof and said portion of said control valve means further having a third position in which both said channels are sealed from said reservoir and communicate with said source.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |