US3593575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination flow meter and control valve
Assignee: Emerson Electric Co
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Filing: 1968-01-05
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Granted: 1971-07-20
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Expires: 1988-01-05
Abstract
Abstract A combination variable area meter and flow limiter having a pilot valve plug and a readout magnet attached to a float rod of the variable area meter. Seating of the pilot valve plug in an adjustable pilot valve seat increases pressure in a control chamber, forcing down a skirt-guided plug and diaphragm assembly to limit the flow. A shutoff valve downstream of the pilot valve seat overrides the adjustable flow limit for shutoff without altering the flow limit setting.
Inventors
- 👤 Horst R Thieme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:21
CPC Classifications
G; G01; G01F; G01F1/00; F; F16; F16K; F16K31/00; F16K31/12; F16K31/18; G01F1/05; G01F1/20; G01F1/22; G01F1/26; G05; G05D; G05D7/00; G05D7/01; G05D7/0126; G05D7/0133; G05D7/014; G05D7/0146; G05D7/0153
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
142 words
A device for metering and controlling the flow of a fluid, comprising flow-limiting means; control means for controlling said flow-limiting means, said control means comprising a control chamber having a movable wall for expanding and contracting said control chamber in response to fluid pressure in said control chamber, said movable wall being operatively connected to said flow-limiting means, said control means further comprising a fluid pilot circuit including a pilot valve part for controlling pressure in said control chamber; flow-sensing means comprising a variable area meter; and pilot means, carried by said variable area meter, for causing said control means to control said flowlimiting means, said pilot means cooperating with said pilot valve part when and only when the flow closely approaches a predetermined maximum to vary pressure in said control chamber and thereby to maintain said flow at said predetermined maximum.
Claim 2
Independent Claim
142 words
A device for metering and controlling the flow of a fluid, comprising flow-limiting means; control means for controlling said flow-limiting means, said control means comprising a control chamber having a movable wall for expanding and contracting said control chamber in response to fluid pressure in said control chamber, said movable wall being operatively connected to said flow-limiting means, said control means further comprising a fluid pilot circuit including a pilot valve part for controlling pressure in said control chamber; flow-sensing means comprising a variable area meter; and pilot means, carried by said variable area meter, for causing said control means to control said flowlimiting means, said pilot means cooperating with said pilot valve part when and only when the flow closely approaches a predetermined maximum to vary pressure in said control chamber and thereby to maintain said flow at said predetermined maximum.
Claim 3
Dependent Claim
43 words
The device of claim 1 wherein the pilot means carried by said variable area meter comprise a restriction valve member proportioned and arranged to cooperate with said pilot valve part in said fluid pilot circuit when said flow closely approaches said predetermined maximum.
Claim 4
Dependent Claim
21 words
The device of claim 2 wherein the pilot valve part in said fluid pilot circuit is adjustably mounted in said device.
Claim 5
Dependent Claim
16 words
The device of claim 2 wherein the pilot means is secured to said variable area meter.
Claim 6
Independent Claim
254 words
A device for measuring the flow of liquid passing through it and for maintaining the flow thereof at an adjustable predetermined maximum, comprising a casing having an inlet and an outlet, a plug mounted within said casing, said plug being movable to restrict the flow of liquid between said inlet and said outlet, a control means for moving said plug to restrict the flow of liquid between said inlet and said outlet when pressure in said control means is increased, a variable area meter, said meter including a float and a float rod, first passage means between said inlet and said control means, restriction means in said first passage means, second passage means between said outlet and said control means, and a pilot valve means for restricting said second passage means, said pilot valve means comprising a first member carried on said float rod and a second, adjustable, member proportioned and arraNged to mate with said first member to restrict said second passage means when said flow closely approaches said adjustable predetermined maximum to increase pressure in said control means, thereby moving said plug to restrict flow between said inlet and said outlet when said flow approaches said predetermined maximum, said first member moving relative to said second member with changes in said flow above and below said predetermined maximum to vary the restriction in said second passage means and thereby to increase and to decrease pressure respectively in said control means thereby moving said plug to maintain said flow at said predetermined maximum.
Claim 7
Independent Claim
254 words
A device for measuring the flow of liquid passing through it and for maintaining the flow thereof at an adjustable predetermined maximum, comprising a casing having an inlet and an outlet, a plug mounted within said casing, said plug being movable to restrict the flow of liquid between said inlet and said outlet, a control means for moving said plug to restrict the flow of liquid between said inlet and said outlet when pressure in said control means is increased, a variable area meter, said meter including a float and a float rod, first passage means between said inlet and said control means, restriction means in said first passage means, second passage means between said outlet and said control means, and a pilot valve means for restricting said second passage means, said pilot valve means comprising a first member carried on said float rod and a second, adjustable, member proportioned and arraNged to mate with said first member to restrict said second passage means when said flow closely approaches said adjustable predetermined maximum to increase pressure in said control means, thereby moving said plug to restrict flow between said inlet and said outlet when said flow approaches said predetermined maximum, said first member moving relative to said second member with changes in said flow above and below said predetermined maximum to vary the restriction in said second passage means and thereby to increase and to decrease pressure respectively in said control means thereby moving said plug to maintain said flow at said predetermined maximum.
Claim 8
Dependent Claim
31 words
The device of claim 5 including a shutoff valve in said second passage means, said shutoff valve being operable to shut off flow through said device independent of said pilot valve.
Claim 9
Dependent Claim
35 words
The device of claim 5 wherein said float rod is hollow and an aperture in said first member communicates through said float rod with a chamber into which an end of said float rod passes.
Claim 10
Dependent Claim
12 words
The device of claim 5 wherein said plug comprises a skirt-guided plug.
Claim 11
Dependent Claim
17 words
The device of claim 8 wherein said first passage means comprises a passage through said skirt-guided plug.
Claim 12
Dependent Claim
16 words
The device of claim 5 wherein said first member is carried fixedly on said float rod.
Claim 13
Dependent Claim
21 words
The device of claim 5 wherein said first member is a valve plug and said second member is a valve seat.
Claim 14
Independent Claim
142 words
A device for measuring the flow of fluid passing through it and for maintaining said flow at a predetermined maximum, comprising a variable area meter, flow-indicating means cooperative with said variable area meter, flow-limiting means for restricting flow through said device, and control means for moving said flow-limiting means, said variable area meter comprising a float, a float rod, first means on said float rod for cooperating with said flow-indicating means and second means on said float rod for cooperating with said control means to cause said flow-limiting means to prevent greater flow when said flow approaches said predetermined maximum and to permit greater flow when said flow decreases from said predetermined maximum, said variable area meter and said flow-limiting means moving independent of each other and independent of said control means when said flow is substantially less than said predetermined maximum.
Claim 15
Independent Claim
142 words
A device for measuring the flow of fluid passing through it and for maintaining said flow at a predetermined maximum, comprising a variable area meter, flow-indicating means cooperative with said variable area meter, flow-limiting means for restricting flow through said device, and control means for moving said flow-limiting means, said variable area meter comprising a float, a float rod, first means on said float rod for cooperating with said flow-indicating means and second means on said float rod for cooperating with said control means to cause said flow-limiting means to prevent greater flow when said flow approaches said predetermined maximum and to permit greater flow when said flow decreases from said predetermined maximum, said variable area meter and said flow-limiting means moving independent of each other and independent of said control means when said flow is substantially less than said predetermined maximum.
Claim 16
Dependent Claim
31 words
The device of claim 12 wherein said variable area meter moves independent of said control means in response to a small change in flow when said flow equals said predetermined maximum.
Claim 17
Independent Claim
267 words
A device for measuring the flow of liquid passing through it and maintaining the flow thereof at a predetermined maximum, comprising a casing; flow-limiting means in said casing; an inlet side of said casing and an outlet side of said casing separated from said inlet side by said flow limiting means, said flow limiting means being movable to restrict the flow of liquid between said inlet side and said outlet side; a control chamber in said casing, said control chamber having a movable wall for expanding said control chamber in response to increased pressure in said control chamber, said movable wall being operatively connected to said flow-limiting means for moving said flow-limiting means to restrict the flow of liquid between said inlet side and said outlet side in response to increased pressure in said control chamber; first passage means between said inlet side and said control chamber; second passage means between said outlet side and said control chamber; flow-sensing means in said casing for determining flow through said device; and pilot means operatively connected to said flow-sensing means for restricting said second passage means when said flow approaches said predetermined maximum thereby increasing pressure in said control chamber and moving said flow-limiting means to restrict flow between said inlet and said outlet when said flow approaches said predetermined maximum, said pilot means moving to vary the restrictiOn of said second passage means with changes in said flow above and below said predetermined maximum to increase and to decrease pressure respectively in said control chamber thereby moving said flow-limiting means to maintain said flow at said predetermined maximum.
Claim 18
Independent Claim
267 words
A device for measuring the flow of liquid passing through it and maintaining the flow thereof at a predetermined maximum, comprising a casing; flow-limiting means in said casing; an inlet side of said casing and an outlet side of said casing separated from said inlet side by said flow limiting means, said flow limiting means being movable to restrict the flow of liquid between said inlet side and said outlet side; a control chamber in said casing, said control chamber having a movable wall for expanding said control chamber in response to increased pressure in said control chamber, said movable wall being operatively connected to said flow-limiting means for moving said flow-limiting means to restrict the flow of liquid between said inlet side and said outlet side in response to increased pressure in said control chamber; first passage means between said inlet side and said control chamber; second passage means between said outlet side and said control chamber; flow-sensing means in said casing for determining flow through said device; and pilot means operatively connected to said flow-sensing means for restricting said second passage means when said flow approaches said predetermined maximum thereby increasing pressure in said control chamber and moving said flow-limiting means to restrict flow between said inlet and said outlet when said flow approaches said predetermined maximum, said pilot means moving to vary the restrictiOn of said second passage means with changes in said flow above and below said predetermined maximum to increase and to decrease pressure respectively in said control chamber thereby moving said flow-limiting means to maintain said flow at said predetermined maximum.
Claim 19
Dependent Claim
24 words
The device of claim 14 wherein said flow-sensing means comprise a variable area meter, said pilot means being carried by said variable area meter.
Claim 20
Dependent Claim
50 words
The device of claim 14 wherein the pilot means comprise a first, movable, restriction valve member, and the second passage means comprise a second, fixed, valve member, said first valve member being proportioned and arranged to cooperate with said second valve member when said flow closely approaches said predetermined maximum.
Claim 21
Dependent Claim
29 words
The device of claim 16 wherein the second valve member is adjustable mounted in said device, whereby said predetermined maximum is adjustable by adjustment of the second valve member.
Claim 22
Dependent Claim
31 words
The device of claim 14 including a shutoff valve in said second passage means, said shutoff valve being operable to shut off flow through said device independent of said pilot means.
Claim 23
Dependent Claim
13 words
The device of claim 14 wherein said flow-limiting means comprise a skirt-guided plug.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |