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US3566902A
Expired / Lapsed
US
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Fluid flow system
Assignee: Watts Water Technologies Inc
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Filing: 1968-05-13
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Granted: 1971-03-02
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Expires: 1988-05-13
Abstract
Abstract In a fluid flow system having at least two flow branches whose pressure drop variations with flow rate changes are different, a flexible orifice is placed in a branch with the lesser pressure drop. The pressure drop across this orifice, which expands with increasing flow rate, tends to balance the pressure drop in the other branch or branches so as to make possible predetermined control of the fluid flow in the system.
Inventors
- 👤 John T Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:57
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0106; G05D7/012; F; F16; F16K; F16K47/00; F16K47/08; F16K47/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788; Y10T137/8593; Y10T137/87571; Y10T137/87676
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
208 words
In a fluid flow system having at least two flow branches, a first one of the branches having a significantly greater flow resistance than a second branch, a blending flow control valve interconnecting and providing a common discharge for said flow branches and maintaining a predetermined fluid flow through said second branch with relation to the flow through said first branch of the system, and a pressure-sensitive element for operating the blending flow control valve responsive to pressure in said second branch, the improvement which comprises a flexible orificeforming element positioned in a relatively low flow resistance portion of said second branch of the system in the path of fluid flow, the flexibility of the orifice-forming element producing a progressive increase in the size of the orifice with increasing flow-rate, a first pressure-sensing line connected to the system on the upstream side of the orifice, a second pressure-sensing line connected to the system on the downstream side of the orifice, and the pressure-sensitive element comprises a pressuredifferential sensing means connected to the two pressure-sensing lines for sensing the differential in pressure therebetween as the pressure which operates the aforesaid pressure-sensitive element in such manner as to maintain said predetermined flow relation between said flow branches of the system.
Claim 2
Dependent Claim
208 words
In a fluid flow system having at least two flow branches, a first one of the branches having a significantly greater flow resistance than a second branch, a blending flow control valve interconnecting and providing a common discharge for said flow branches and maintaining a predetermined fluid flow through said second branch with relation to the flow through said first branch of the system, and a pressure-sensitive element for operating the blending flow control valve responsive to pressure in said second branch, the improvement which comprises a flexible orificeforming element positioned in a relatively low flow resistance portion of said second branch of the system in the path of fluid flow, the flexibility of the orifice-forming element producing a progressive increase in the size of the orifice with increasing flow-rate, a first pressure-sensing line connected to the system on the upstream side of the orifice, a second pressure-sensing line connected to the system on the downstream side of the orifice, and the pressure-sensitive element comprises a pressuredifferential sensing means connected to the two pressure-sensing lines for sensing the differential in pressure therebetween as the pressure which operates the aforesaid pressure-sensitive element in such manner as to maintain said predetermined flow relation between said flow branches of the system.
Claim 3
Dependent Claim
29 words
A fluid flow system according to claim 1 which tHe flexible orifice-forming element comprises a flexible disc having a central opening and slits radiating outwardly from the central opening.
Claim 4
Dependent Claim
37 words
A fluid flow system according to claim 1 in which the flexible orifice-forming element is provided on the downstream side thereof with a restraining wall adapted to limit the expansion of the orifice under maximum flowrate conditions.
Claim 5
Dependent Claim
32 words
A fluid flow system according to claim 1 in which the flow control valve maintains a predetermined ratio of fluid flow through at least two of the branches of the flow system.
References Cited (Backward Citations)
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |