US3882882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for metering a substance into liquid flowing in a conduit
Assignee: Dr Wrede & Co Standard-Messgerate Fabrikation
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Filing: 1973-08-24
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Granted: 1975-05-13
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Expires: 1993-08-24
Abstract
Abstract A flowmeter carries a cam disk which periodically operates a pivot valve that in turn actuates a pneumatic follower valve connected to a pump which for each actuation of the valves injects a predetermined quantity of a fluid additive into the conduit provided with the flowmeter. The pilot valve is operated by a lever which rides on the periphery of the cam disk and a reset mechanism is provided to displace the operating lever into the closed-valve position if the disk stops rotating and does not return the lever.
Inventors
- 👤 Jurg Preisig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:06
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/02; G05D11/035; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2516; Y10T137/8593; Y10T137/85978; Y10T137/85986
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A system for introducing an additive into fluid passing through a conduit, siad system comprising: flowmeter means in said conduit having an operating element which rotates at a rate proportional to volume rate of fluid flow in said conduit for generating a periodic output having a frequency proportional to said volume rate of flow; pneumatically operable pump means connected to a source of said additive and including a fluid line connected to said conduit for injecting a predetermined quantity of said additive into said conduit through said fluid line; valve means including a pilot valve connected to said flowmeter means and to said source of pressurized gas and a follower valve connected to said pilot valve, to said source of pressurized gas and to said pump means for pneumatically operating said pump means each time said flowmeter means generates an output, said pilot valve having a membrane formed with a pinpoint orifice; and reset means connected to said valve means for closing said follower valve and thereby halting operating of said pump after a predetermined period of said operating element being in a position wherein said flowmeter means generates an output.
Claim 2
Independent Claim
191 words
A system for introducing an additive into fluid passing through a conduit, siad system comprising: flowmeter means in said conduit having an operating element which rotates at a rate proportional to volume rate of fluid flow in said conduit for generating a periodic output having a frequency proportional to said volume rate of flow; pneumatically operable pump means connected to a source of said additive and including a fluid line connected to said conduit for injecting a predetermined quantity of said additive into said conduit through said fluid line; valve means including a pilot valve connected to said flowmeter means and to said source of pressurized gas and a follower valve connected to said pilot valve, to said source of pressurized gas and to said pump means for pneumatically operating said pump means each time said flowmeter means generates an output, said pilot valve having a membrane formed with a pinpoint orifice; and reset means connected to said valve means for closing said follower valve and thereby halting operating of said pump after a predetermined period of said operating element being in a position wherein said flowmeter means generates an output.
Claim 3
Dependent Claim
25 words
The system defined in claim 1 wherein said operating element is a cam disk and said valve means includes a cam follower engaging said disk.
Claim 4
Dependent Claim
85 words
The system defined in claim 1 wherein said pump means has a housing, a pneumatically displaceable membrane subdividing said housing in a pair of chambers, a check valve opening into one of said chambers and connected to said source of said additive for allowing flow into said one chamber and another check valve opening into said one chamber and connected to said line for allowing flow from said one chamber, the other chamber being connectable through said valve means to said source of pressurized gas.
Claim 5
Dependent Claim
129 words
The system defined in claim 1 wherein said valve means includes an actuating element connected to said flowmeter means and displaceable between a first position corresponding to an actuated condition of said pump and a second position corresponding to a nonactuated condition of said pump, said flowmeter means further comprising a cam rotatable at a rate proportional to volume rate of flow of said fluid in said conduit, said actuating element engaging said cam and being displaceable thereby between said first and second positions, said reset means including an actuator engageable with said actuating element for displacing same from said first to said second position, and means for preventing engagement of said actuator with said actuating element except in a position of said cam corresponding to said first position.
Claim 6
Dependent Claim
22 words
The system defined in claim 4 wherein said cam is a cam disk having a noncircular periphery engaged by said actuating element.
Claim 7
Dependent Claim
22 words
The system defined in claim 4 wherein said means for preventing engagement includes formation on said cam operatively connectable with said actuator.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |