Patent US4995422A successfully refreshed from Google Patents.
US4995422A
Expired / Lapsed
US
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Flow control valve
Assignee: BRAND HYDRAULICS Co Inc A CORP OF NE
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Filing: 1989-11-13
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Granted: 1991-02-26
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Expires: 2009-11-13
Abstract
Abstract A pressure compensated flow control valve including a body member having an axial bore extending to a closed end and a number of radially aligned ports formed near the closed end. A cylindrical spool is disposed within the axial bore and is movable between a controlled flow position where the spool extends over a portion of the radial ports and a reverse flow position where the radial ports are unobstructed. An orifice formed in an end plate of the spool is sized to allow a predetermined flow rate.
Inventors
- 👤 Timmy L. Chew
- 👤 Glen Brand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:37
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0146; Y; Y10; Y10S; Y10S137/00; Y10S137/904; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7792
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
238 words
A pressure compensated flow control valve for use in combination with a hydraulic fitting having female threads wherein the flow control valve comprises: an elongated body member having an axial bore extending through said body member to a point near a closed end, said body member having a radially aligned port formed therein in the vicinity of said closed end and male threads formed upstream of said radially aligned port wherein said male threads will operatively engage the female threads on said hydraulic fitting; a cylindrical spool including an open tubular skirting and an end plate having an orifice sized to allow flow of a fluid at a predetermined flow rate, said skirting being disposed in mating relationship with said axial bore with said end plate being directed away from said closed end, said spool being movable between a controlled flow position wherein the skirting extends over a portion of the radially aligned port and a reverse flow position wherein the radially aligned port is unobstructed; means for biasing said spool away from said closed end; and means for retaining said spool within the axial bore wherein said retaining means includes a stop attached to said body member and disposed to engage the end plate when said spool is in the reverse flow position and wherein said stop is a compression spring having opposite ends disposed to engage portions of an annular recess formed in said body member.
Claim 2
Dependent Claim
238 words
A pressure compensated flow control valve for use in combination with a hydraulic fitting having female threads wherein the flow control valve comprises: an elongated body member having an axial bore extending through said body member to a point near a closed end, said body member having a radially aligned port formed therein in the vicinity of said closed end and male threads formed upstream of said radially aligned port wherein said male threads will operatively engage the female threads on said hydraulic fitting; a cylindrical spool including an open tubular skirting and an end plate having an orifice sized to allow flow of a fluid at a predetermined flow rate, said skirting being disposed in mating relationship with said axial bore with said end plate being directed away from said closed end, said spool being movable between a controlled flow position wherein the skirting extends over a portion of the radially aligned port and a reverse flow position wherein the radially aligned port is unobstructed; means for biasing said spool away from said closed end; and means for retaining said spool within the axial bore wherein said retaining means includes a stop attached to said body member and disposed to engage the end plate when said spool is in the reverse flow position and wherein said stop is a compression spring having opposite ends disposed to engage portions of an annular recess formed in said body member.
Claim 3
Dependent Claim
29 words
The valve of claim 1 wherein said biasing means includes a compression spring disposed between the closed end of said body member and the end plate of said spool.
Claim 4
Dependent Claim
64 words
The valve of claim 1 further including: an enlarged axial bore extending from an open end toward the closed end to a point beyond the stop; and a side port formed in the spool in the vicinity of the end plate such that the side port is disposed in communication with the enlarged axial bore when the spool is in the reverse flow position.
Claim 5
Dependent Claim
43 words
The valve of claim 3 further including a plurality of side ports formed in the spool in the vicinity of the end plate, wherein the combined cross-sectional area of the side ports is approximately equal to the cross-sectional area of the axial bore.
Claim 6
Dependent Claim
46 words
The valve of claim 1 further including a plurality of radially aligned ports formed in the body member in the vicinity of the closed end, wherein the combined cross-sectional area of the radially aligned ports is approximately equal to the cross-sectional area of the axial bore.
Claim 7
Dependent Claim
29 words
The valve of claim 1 wherein said biasing means includes a compression spring disposed between the closed end of said body member and the end plate of said spool.
Claim 8
Dependent Claim
198 words
A pressure compensated flow control valve comprising: an elongated body member having an axial bore extending through said body member to a point near a closed end, said body member having a radially aligned port formed therein in the vicinity of said closed end; a cylindrical spool including an open tubular skirting and an end plate having an orifice sized to allow flow of a fluid at a predetermined flow rate, said skirting being disposed in mating relationship with said axial bore with said end plate being directed away from said closed end, said spool being movable between a controlled flow position wherein the skirting extends over a portion of the radially aligned port and a reverse flow position wherein the radially aligned port is unobstructed; means for biasing said spool away from said closed end; and, means for retaining said spool within the axial bore; wherein, said retaining means includes a stop attached to said body member and disposed to engage the end plate when said spool is in the reverse flow position; and, wherein said stop is a compression spring having opposite ends disposed to engage portions of an annular recess formed in said body member.
Claim 9
Dependent Claim
198 words
A pressure compensated flow control valve comprising: an elongated body member having an axial bore extending through said body member to a point near a closed end, said body member having a radially aligned port formed therein in the vicinity of said closed end; a cylindrical spool including an open tubular skirting and an end plate having an orifice sized to allow flow of a fluid at a predetermined flow rate, said skirting being disposed in mating relationship with said axial bore with said end plate being directed away from said closed end, said spool being movable between a controlled flow position wherein the skirting extends over a portion of the radially aligned port and a reverse flow position wherein the radially aligned port is unobstructed; means for biasing said spool away from said closed end; and, means for retaining said spool within the axial bore; wherein, said retaining means includes a stop attached to said body member and disposed to engage the end plate when said spool is in the reverse flow position; and, wherein said stop is a compression spring having opposite ends disposed to engage portions of an annular recess formed in said body member.
Claim 10
Dependent Claim
64 words
The valve of claim 7 further including: an enlarged axial bore extending from an open end toward the closed end to a point beyond the stop; and, a side port formed in the spool in the vicinity of the end plate such that the side port is disposed in communication with the enlarged axial bore when the spool is in the reverse flow position.
Claim 11
Dependent Claim
46 words
The valve of claim 7 further including a plurality of radially aligned ports formed in the body member in the vicinity of the closed end, wherein the combined cross-sectional area of the radially aligned ports is approximately equal to the cross-sectional area of the axial bore.
Claim 12
Dependent Claim
43 words
The valve of claim 9 further including a plurality of side ports formed in the spool in the vicinity of the end plate, wherein the combined cross-sectional area of the side ports is approximately equal to the cross-sectional area of the axial bore.
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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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |