Patent US5769390A successfully refreshed from Google Patents.
US5769390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control valve
Assignee: Nissan Motor Co Ltd
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Filing: 1996-06-14
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Granted: 1998-06-23
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Expires: 2016-06-14
Abstract
Abstract A valve is connected to a valve stem, and is closed by the elastic force of a spring acting on it via the valve stem. The valve is opened, on the other hand, when a stepping motor displaces the valve stem coaxially against the force of the spring via a rotor shaft. A predetermined clearance D is set between the rotor shaft in a predetermined position and the valve stem in a seating position. When a fault is detected in the closing of the valve, the rotor shaft is displaced beyond this clearance D so as to directly drive the valve stem in the valve closing direction and thereby close the valve forcibly without the agency of the spring.
Inventors
- 👤 Shosaku Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:26
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/04; F16K31/046; F02; F02M; F02M26/00; F02M26/52; F02M26/53; F02M26/54; F16K37/00; F02M26/65; F02M26/72; F02M26/73
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
180 words
A flow control valve comprising; a valve body, a valve seat in which said valve body is seated for closing the valve, a valve stem connected to said valve body which is displaced in a valve closing direction according to a compressive load in an axial direction, elastic means which applies said compressive load to said valve stem, a rotor shaft coaxial with said valve stem, a connector which elastically connects said rotor shaft with said valve stem, a stepping motor which displaces said rotor shaft in an axial direction, means to drive said stepping motor such that said rotor shaft is set in a predetermined position while compressing said connector, said rotor shaft having a predetermined clearance D relative to said valve stem in a valve body seating position when said rotor shaft is in said predetermined position, means for detecting a fault in the seating of said valve body, and means to drive said stepping motor such that said rotor shaft moves in a direction of said valve stem beyond said clearance D when said fault is detected.
Claim 2
Dependent Claim
180 words
A flow control valve comprising; a valve body, a valve seat in which said valve body is seated for closing the valve, a valve stem connected to said valve body which is displaced in a valve closing direction according to a compressive load in an axial direction, elastic means which applies said compressive load to said valve stem, a rotor shaft coaxial with said valve stem, a connector which elastically connects said rotor shaft with said valve stem, a stepping motor which displaces said rotor shaft in an axial direction, means to drive said stepping motor such that said rotor shaft is set in a predetermined position while compressing said connector, said rotor shaft having a predetermined clearance D relative to said valve stem in a valve body seating position when said rotor shaft is in said predetermined position, means for detecting a fault in the seating of said valve body, and means to drive said stepping motor such that said rotor shaft moves in a direction of said valve stem beyond said clearance D when said fault is detected.
Claim 3
Dependent Claim
23 words
A flow control valve according to claim 1, wherein said means to drive said rotor shaft to clearance D comprises initialization control means.
Claim 4
Dependent Claim
24 words
A flow control valve according to claim 1, wherein said means to drive said rotor shaft beyond said clearance D comprises a control unit.
Claim 5
Dependent Claim
26 words
A flow control valve according to claim 1, wherein said means to drive said rotor shaft to and beyond clearance D comprises a single control unit.
Claim 6
Dependent Claim
191 words
A flow control valve comprising; a valve body, a valve seat in which said valve body is seated for closing the valve, a valve stem connected to said valve body which is displaced in a valve closing direction according to a tensile load in an axial direction, elastic means which applies said tensile load to said valve stem, a rotor shaft coaxial with said valve stem, a stepping motor which displaces said rotor shaft in an axial direction, a hook attached to said rotor shaft which pulls said valve stem according to the displacement of said shaft in a direction away from said valve stem, means to drive said stepping motor such that said rotor shaft is set in a predetermined position, said hook having a predetermined clearance D relative to said valve stem in a valve body seating position when said rotor shaft is in said predetermined position, means for detecting a fault in the seating of said valve body, and means to drive said stepping motor such that said rotor shaft moves in a direction away from said valve stem beyond said clearance D when said fault is detected.
Claim 7
Dependent Claim
191 words
A flow control valve comprising; a valve body, a valve seat in which said valve body is seated for closing the valve, a valve stem connected to said valve body which is displaced in a valve closing direction according to a tensile load in an axial direction, elastic means which applies said tensile load to said valve stem, a rotor shaft coaxial with said valve stem, a stepping motor which displaces said rotor shaft in an axial direction, a hook attached to said rotor shaft which pulls said valve stem according to the displacement of said shaft in a direction away from said valve stem, means to drive said stepping motor such that said rotor shaft is set in a predetermined position, said hook having a predetermined clearance D relative to said valve stem in a valve body seating position when said rotor shaft is in said predetermined position, means for detecting a fault in the seating of said valve body, and means to drive said stepping motor such that said rotor shaft moves in a direction away from said valve stem beyond said clearance D when said fault is detected.
Claim 8
Dependent Claim
23 words
A flow control valve according to claim 5, wherein said means to drive said rotor shaft to clearance D comprises initialization control means.
Claim 9
Dependent Claim
24 words
A flow control valve according to claim 2, wherein said means to drive said rotor shaft beyond said clearance D comprises a control unit.
Claim 10
Dependent Claim
26 words
A flow control valve according to claim 2, wherein said means to drive said rotor shaft to and beyond clearance D comprises a single control unit.
References Cited (Backward Citations)
JPS56158934A
Cited
JPS6296770A
Cited
US4742989A
Cited
JPH01203646A
Cited
JPH05543A
Cited
US5351935A
Cited
US5503131A
Cited
US5579743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-22 | 2001-12-22 | 2002-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-22 | 2005-12-22 | 2006-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-22 | 2009-12-22 | 2010-06-23 | $7700.00 | Window Closed / Lapsed |