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US3859619A
Expired / Lapsed
US
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Valve operation detecting device
Assignee: Denso Corp
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Filing: 1973-06-20
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Granted: 1975-01-07
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Expires: 1993-06-20
Abstract
Abstract A valve operation detecting device having a sensing means, such as a reed switch, a differential transformer or a variable capacitor which operates in accordance with the movement of a valve body provided in the valve for detecting the opening and closing operation of the valve body to be able to recognize and confirm the valve body operation from the outside easily.
Inventors
- 👤 Shinya Ishihara
- 👤 Kiyohiko Mizuno
- 👤 Hiroaki Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:12
CPC Classifications
F; F16; F16K; F16K37/00; F16K37/0025; F16K37/0033; F16K37/0041; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A valve operation detecting device for detecting the opening and closing operation of a valve wherein said valve includes: a valve body, a movable diaphragm connected to said valve body, and a non-magnetic covering case enclosing said diaphragm, the detecting device comprising a reed switch removably mounted on said non-magnetic covering case, a permanent magnet movable with respect to said reed switch in accordance with the movement of said diaphragm, and indicating means connected to said reed switch for indicating the movement of said valve body in accordance with the opening and closing of said reed switch.
Claim 2
Dependent Claim
97 words
A valve operation detecting device for detecting the opening and closing operation of a valve wherein said valve includes: a valve body, a movable diaphragm connected to said valve body, and a non-magnetic covering case enclosing said diaphragm, the detecting device comprising a reed switch removably mounted on said non-magnetic covering case, a permanent magnet movable with respect to said reed switch in accordance with the movement of said diaphragm, and indicating means connected to said reed switch for indicating the movement of said valve body in accordance with the opening and closing of said reed switch.
Claim 3
Dependent Claim
87 words
A valve operation detecting device for detecting the opening and closing operation of a valve body, a movable diaphragm connected to said valve body, and a non-magnetic covering case enclosing said diaphragm, the detecting device comprising: a differential transformer having coils removably mounted on said non-magnetic covering case, a permanent magnet core movable with respect to said coils in accordance with the movement of said diaphragm, and indicating means connected to said coils for indicating the movement of said permanent magnet core with respect to said coils.
Claim 4
Dependent Claim
87 words
A valve operation detecting device for detecting the opening and closing operation of a valve body, a movable diaphragm connected to said valve body, and a non-magnetic covering case enclosing said diaphragm, the detecting device comprising: a differential transformer having coils removably mounted on said non-magnetic covering case, a permanent magnet core movable with respect to said coils in accordance with the movement of said diaphragm, and indicating means connected to said coils for indicating the movement of said permanent magnet core with respect to said coils.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |