US4617952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching valve and an electro-pneumatic pressure converter utilizing the same
Assignee: Azbil Corp
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Filing: 1985-07-18
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Granted: 1986-10-21
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Expires: 2005-07-18
Abstract
Abstract A switching valve has at least one plate-shaped piezo-electric element having a free end which is supported in a sealed chamber, at least two fluid directing nozzles arranged to be opened or closed due to the position of the free end of the piezo-electric element and a fluid output passage communicating outwardly from said sealed chamber. An electric-pressure converter uses the switching valve, a pilot relay for converting a fluid pressure signal delivered from the output passage into a standard air pressure signal, a pressure sensor for converting the pressure signal from said pilot relay into an electrical signal, pulse-width modulating means for providing a pulse-width modulated signal, which corresponds to the deviation between the electrical signal from the pressure sensor and an external reference electric signal, for energizing the plate-shaped piezo-electric element in the switching valve.
Inventors
- 👤 Masatoshi Fujiwara
- 👤 Masato Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:33
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/004; F16K31/005; F16K31/006; F15; F15B; F15B5/00; F15B5/003; F16K11/00; F16K11/02; F16K11/022; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/8593; Y10T137/86493; Y10T137/86847; Y10T137/86855; Y10T137/87169; Y10T137/87217
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
An electric-pressure converter comprising a sealed chamber, a switching valve having at least one plate-shaped electric current deformable element mean having at least one free end which is supported in said sealed chamber, at least two pressure injection nozzles arranged to be opened or closed due to a position of said free end of said element means, and an output passage communicating outwardly from said sealed chamber, means for converting the air pressure signal routed from said output passage into a regulated air pressure signal, a pressure sensor for converting the pressure signal from said means for converting into an electrical signal, pulse-width modulating means for providing a pulse-width modulating signal which corresponds to the deviation between the electrical signal from said pressure sensor and an external electric reference signal for energizing said plate-shaped electric current deformable element means in said switching valve.
Claim 2
Dependent Claim
143 words
An electric-pressure converter comprising a sealed chamber, a switching valve having at least one plate-shaped electric current deformable element mean having at least one free end which is supported in said sealed chamber, at least two pressure injection nozzles arranged to be opened or closed due to a position of said free end of said element means, and an output passage communicating outwardly from said sealed chamber, means for converting the air pressure signal routed from said output passage into a regulated air pressure signal, a pressure sensor for converting the pressure signal from said means for converting into an electrical signal, pulse-width modulating means for providing a pulse-width modulating signal which corresponds to the deviation between the electrical signal from said pressure sensor and an external electric reference signal for energizing said plate-shaped electric current deformable element means in said switching valve.
Claim 3
Dependent Claim
29 words
A converter as set forth in claim 1 wherein said element means includes electric terminals for connecting to a voltage supply for applying an energizing voltage across said element.
Claim 4
Dependent Claim
42 words
A converter as set forth in claim 1 wherein said element means includes a first piezo-electric element having a free end associated with a first one of said nozzles and a second piezo-electric element associated with a second one of said nozzles.
Claim 5
Dependent Claim
34 words
A converter as set forth in claim 3 wherein said element means includes electric terminals for connecting to a voltage supply for concurrently applying an energizing voltage across said first and second piezo-electric elements.
Claim 6
Dependent Claim
45 words
A converter as set forth in claim 1 wherein said element means includes a piezo-electric element centrally supported and having a first free end associated with a first one of said nozzles and a second free end associated with a second one of said nozzles.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |