US3766944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot controlled fluid flow regulating valve
Assignee: Bosch Rexroth AG
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Filing: 1972-10-19
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Granted: 1973-10-23
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Expires: 1992-10-19
Abstract
Abstract A fluid flow regulating valve wherein the housing receives a reciprocable spool and has a chamber which can receive pressurized fluid from a pump by way of a pilot valve to thereby move the spool from a neutral position to an intermediate position and thereupon to one of several operative positions. The fluid pressure in the chamber acts against one end face of a piston which is mounted in the body of the pilot valve and can be displaced by a control spring which can be deformed by a manually operated handle. A relatively minor deformation of the control spring suffices to move the spool to the intermediate position so that the spring can undergo a much larger additional deformation in order to move the spool to a selected operative position. A regulating spring in the housing of the regulating valve does not oppose the movement of the spool to intermediate position but the regulating spring offers a substantial resistance to movement of the spool to an operative position. This enables the operator to sense that the control spring offers a greatly increased resistance to further deformation by the handle.
Inventors
- 👤 J Distler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:06
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/0422; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/38; F16K31/383; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/87056; Y10T137/87072
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
226 words
A valve assembly, comprising a regulating valve including a housing having a fluid-receiving chamber and a valve element movable in said housing from a neutral position, through an intermediate position, and to a plurality of operative positions in response to admission of pressurized fluid into said chamber; and a pilot valve having a body provided with inlet means connected to a source of pressurized fluid and port means connected to said chamber, a valve member movable in said body to control the flow of fluid between said inlet means and said port means and having a surface exposed to fluid pressure prevailing in said chamber, control spring means mounted in said body and being deformable to thereby displace said valve member against the opposition of fluid pressure acting against said surface, and means for subjecting said control spring means to a relatively small initial deforming force so as to balance the fluid pressure acting against said surface and to thereby maintain said valve member in a position wherein said valve member seals said port means from said inlet means in said intermediate position of said valve element, and to a relatively wide range of additional deforming forces so as to displace said valve member and to allow additional pressurized fluid to enter said chamber and to move said valve element to one of said operative positions.
Claim 2
Dependent Claim
226 words
A valve assembly, comprising a regulating valve including a housing having a fluid-receiving chamber and a valve element movable in said housing from a neutral position, through an intermediate position, and to a plurality of operative positions in response to admission of pressurized fluid into said chamber; and a pilot valve having a body provided with inlet means connected to a source of pressurized fluid and port means connected to said chamber, a valve member movable in said body to control the flow of fluid between said inlet means and said port means and having a surface exposed to fluid pressure prevailing in said chamber, control spring means mounted in said body and being deformable to thereby displace said valve member against the opposition of fluid pressure acting against said surface, and means for subjecting said control spring means to a relatively small initial deforming force so as to balance the fluid pressure acting against said surface and to thereby maintain said valve member in a position wherein said valve member seals said port means from said inlet means in said intermediate position of said valve element, and to a relatively wide range of additional deforming forces so as to displace said valve member and to allow additional pressurized fluid to enter said chamber and to move said valve element to one of said operative positions.
Claim 3
Dependent Claim
30 words
A valve assembly as defined in claim 1, wherein said regulating valve further comprises regulating spring means arranged to oppose the movement of said valve element beyoNd said intermediate position.
Claim 4
Dependent Claim
45 words
A valve assembly as defined in claim 2, wherein said regulating valve further comprises centering spring means for urging said valve element to said neutral position, the characteristic curve of said regulating spring means being steeper than the characteristic curve of said centering spring means.
Claim 5
Dependent Claim
45 words
A valve assembly as defined in claim 1, wherein said body is further provided with fluid-discharging outlet means, said valve member being arranged to seal said port means from said inlet means and from said outlet means in said intermediate position of said valve element.
Claim 6
Dependent Claim
72 words
A valve assembly as defined in claim 1, wherein said means for subjecting said control spring means to said deforming forces comprises actuating means movably mounted in said body and manually operated means for moving said actuating means whereby said actuating means subjects said control spring means to the action of a deforming force whose magnitude is a function of the extent of movement of said actuating means relative to said body.
Claim 7
Dependent Claim
36 words
A valve assembly as defined in claim 1, wherein said body is further provided with fluid-discharging outlet means communicating with said chamber by way of said port means in said neutral position of said valve element.
Claim 8
Dependent Claim
30 words
A valve assembly as defined in claim 1, wherein said regulating valve is a multi-way distributor valve and said valve element is a spool which is reciprocable in said housing.
Claim 9
Dependent Claim
54 words
A valve assembly as defined in claim 1, further comprising regulating spring means arranged to oppose the movement of said valve element to said intermediate position with a first force and to oppose the movement of said valve element to one of said operative positions with a second force greatly exceeding said first force.
Claim 10
Dependent Claim
50 words
A valve assembly as defined in claim 8, wherein said valve member connects said chamber and said port means with the atmosphere in said neutral position of said valve element and seals said chamber from the atmosphere and from said inlet means in said intermediate position of said valve element.
Claim 11
Dependent Claim
99 words
A valve assembly as defined in claim 1, wherein said housing is provided with a second fluid-receiving chamber and said body is provided with second part means connected to said second chamber, said pilot valve further comprising a second valve member and second control spring means arranged to control the flow of fluid between said inlet means and said second port means whereby the fluid in said second chamber tends to move said valve element in a direction counter to the direction of movement of said valve element in response to admission of fluid into said first mentioned chamber.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |