Patent US5140645A successfully refreshed from Google Patents.
Patent US3565098A successfully refreshed from Google Patents.
US3565098A
Expired / Lapsed
US
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Pressure viscosity compensating flow control device
Assignee: Individual
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Filing: 1968-11-14
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Granted: 1971-02-23
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Expires: 1988-11-14
Abstract
Abstract A flow control device responsive in operation to variations in pressure and viscosity of the fluid flowing therethrough utilizes a flexible diaphragm having a pressure drop orifice therein movably mounting a spool and valve element which is also biased by an adjustable tensioning means. Differential pressures on the opposite sides of the flexible diaphragm occasioned by the pressure drop orifice therein results in maintaining uniform pressure to flow ratio. An elongated restricted passageway in the spool senses changes in viscosity in the fluid flowing through the device by reason of a corresponding pressure drop along the same which results in moving the spool and valve element to hold the flow through the device as desired. The device is described in a hand paint spray gun wherein changes in pressure and viscosity of the paint flowing through the gun occur and the flow is held by the device as desired, thus, enabling the paint gun to maintain the desired pressure on the nozzle at all times regardless of changes in paint pressure or paint viscosity.
Inventors
- 👤 Frank Welty
- 👤 Raymond D Welty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:50
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0106; B; B05; B05B; B05B1/00; B05B1/30; B05B1/3033; B05B1/304; B05B9/00; B05B9/01; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4259; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/7784; Y10T137/7787; Y10T137/7788; Y10T137/8593; Y10T137/87917; Y10T137/88062
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
A pressure-viscosity compensating fluid flow control device consisting of a housing having inlet and outlet openings and a diaphragm chamber therein, a spaced pair of diaphragms in said chamber, a spool having thru-bore positioned in said chamber engaging central openings in said diaphragms, said inlet opening communicating with the space between said diaphragms, an orifice in one of said diaphragms to conduct fluid to the other side thereof to said thru-bore in said spool whereby fluid flowing through said orifice is conducted to the other end of said spool, an element on said other end of said valve spool for registry with a valve seat communicating with said outlet port and resiliently yieldable means biasing said spool against the axial force exerted by said diaphragms by reason of the pressure drop through said orifice.
Claim 2
Dependent Claim
134 words
A pressure-viscosity compensating fluid flow control device consisting of a housing having inlet and outlet openings and a diaphragm chamber therein, a spaced pair of diaphragms in said chamber, a spool having thru-bore positioned in said chamber engaging central openings in said diaphragms, said inlet opening communicating with the space between said diaphragms, an orifice in one of said diaphragms to conduct fluid to the other side thereof to said thru-bore in said spool whereby fluid flowing through said orifice is conducted to the other end of said spool, an element on said other end of said valve spool for registry with a valve seat communicating with said outlet port and resiliently yieldable means biasing said spool against the axial force exerted by said diaphragms by reason of the pressure drop through said orifice.
Claim 3
Dependent Claim
20 words
The device of claim 1 and wherein the thru-bore is an elongated pressure drop passageway acting as a viscosity sensor.
Claim 4
Dependent Claim
11 words
The device of claim 1 and wherein the diaphragms are integral.
Claim 5
Dependent Claim
17 words
The device of claim 1 and wherein the valve element is positioned downstream of the valve seat.
Claim 6
Dependent Claim
29 words
The device of claim 1 having a secondary inlet opening communicating with the space between said diaphragms through which a second fluid may be directed for flushing said device.
Claim 7
Independent Claim
167 words
A device of passing a predetermined quantity of fluid per unit of time regardless of variations in the pressure of the fluid source and variations in the viscosity of the fluid comprising: a housing having spaced inlet and outlet openings and a combined valve member and a diaphragm in said housing for controlling the flow of fluid between said inlet opening and said outlet opening, means to conduct fluid from the source to the side of the diaphragm which is toward the valve member to create a force on said diaphragm and to the other side of said diaphragm, to create an opposing force thereon, an orifice in said means conducting said fluid to the other side of said diaphragm, secondary means to conduct fluid from said other side of said diaphragm to said outlet opening by way of said valve member and yieldable means biasing said valve member and diaphragm against the axial force exerted by said diaphragm by reason of pressure drop through said orifice.
Claim 8
Independent Claim
167 words
A device of passing a predetermined quantity of fluid per unit of time regardless of variations in the pressure of the fluid source and variations in the viscosity of the fluid comprising: a housing having spaced inlet and outlet openings and a combined valve member and a diaphragm in said housing for controlling the flow of fluid between said inlet opening and said outlet opening, means to conduct fluid from the source to the side of the diaphragm which is toward the valve member to create a force on said diaphragm and to the other side of said diaphragm, to create an opposing force thereon, an orifice in said means conducting said fluid to the other side of said diaphragm, secondary means to conduct fluid from said other side of said diaphragm to said outlet opening by way of said valve member and yieldable means biasing said valve member and diaphragm against the axial force exerted by said diaphragm by reason of pressure drop through said orifice.
Claim 9
Dependent Claim
33 words
The device of claim 6 and wherein said means conducting said fluid to the other side of the diaphragm comprises an orifice through said diaphragm, said orifice acting to create said pressure drop.
Claim 10
Dependent Claim
50 words
The device of claim 7 and wherein said secondary means to conduct fluid from said other side of said diaphragm to said outlet opening comprises an elongated thru-bore in said valve member terminating short of the end thereof, and wherein said end of said valve member engages said outlet opening.
Claim 11
Dependent Claim
27 words
The device of claim 6 and wherein said diaphragm is double with a space therebetween and said means conducting fluid from said source communicates with said space.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |