US4546795A
Expired / Lapsed
US
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Solenoid valve
Assignee: Hitachi Ltd
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Filing: 1984-10-19
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Granted: 1985-10-15
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Expires: 2004-10-19
Abstract
Abstract A solenoid valve in which a pulse signal is applied to an electromagnet thereof to eliminate an electric hysteresis. The solenoid valve includes a piston-like valve slidably supported in a cylinder, and at least one aperture, for communicating with a fluid inlet and a fluid outlet, provided in at least one of the valve and cylinder, whereby the flow rate of a fluid may be continuously controlled and the collision between the valve and a valve seat may be avoided.
Inventors
- 👤 Yoshio Okamoto
- 👤 Kazumi Iwai
- 👤 Hiroshi Inoue
- 👤 Yoshifumi Kunugi
- 👤 Tadashi Shinozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:02
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0644; F16K31/0668; F16K31/0648; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/34; F25B41/345; F25B41/347; Y; Y02; Y02B; Y02B30/00; Y02B30/70; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86421
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
222 words
A solenoid valve including a fluid inlet, a fluid outlet, a plunger adapted to be reciprocated by an electromagnetic force and a force of a spring so as to selectively open or close one of said fluid inlet and said fluid outlet, a piston valve engageable with said plunger, a cylinder slidably accommodating said piston valve, aperture means provided in one of said piston valve and said cylinder for communicating said fluid inlet with said fluid outlet, said spring is interposed between an upper part of said plunger and a mangetic head mounted on a plunger casing, another spring is interposed between a lower part of said piston valve and a body of said solenoid valve whereby a balance condition is achieved between the electromagnetic force and said spring so as to enable a reciprocation of the plunger, said plunger and piston valve being supported solely by a balance of said two springs without contact of the piston valve with an inner wall of said cylinder, and wherein a pulse signal is applied to an electromagnet of said solenoid valve, with at least a pulse repetition period of said pulse signal being varied in a predetermined manner so as to cause a flow rate of the solenoid valve to change continuously so as to obtain a desired value of the flow rate.
Claim 2
Dependent Claim
222 words
A solenoid valve including a fluid inlet, a fluid outlet, a plunger adapted to be reciprocated by an electromagnetic force and a force of a spring so as to selectively open or close one of said fluid inlet and said fluid outlet, a piston valve engageable with said plunger, a cylinder slidably accommodating said piston valve, aperture means provided in one of said piston valve and said cylinder for communicating said fluid inlet with said fluid outlet, said spring is interposed between an upper part of said plunger and a mangetic head mounted on a plunger casing, another spring is interposed between a lower part of said piston valve and a body of said solenoid valve whereby a balance condition is achieved between the electromagnetic force and said spring so as to enable a reciprocation of the plunger, said plunger and piston valve being supported solely by a balance of said two springs without contact of the piston valve with an inner wall of said cylinder, and wherein a pulse signal is applied to an electromagnet of said solenoid valve, with at least a pulse repetition period of said pulse signal being varied in a predetermined manner so as to cause a flow rate of the solenoid valve to change continuously so as to obtain a desired value of the flow rate.
Claim 3
Dependent Claim
16 words
A solenoid valve according to claim 1, wherein said aperture means is provided in said cylinder.
Claim 4
Dependent Claim
19 words
A solenoid valve according to claim 2, wherein said pulse signal is also variable in a pulse width thereof.
Claim 5
Dependent Claim
25 words
A solenoid valve according to claim 1, wherein said pulse signal is variable in both the pulse repetition period and in a pulse width thereof.
Claim 6
Dependent Claim
16 words
A solenoid valve according to claim 1, wherein said piston valve has a cup-shaped cross section.
Claim 7
Dependent Claim
24 words
A solenoid valve according to claim 1, wherein said piston valve moves up and down without contacting with an inner wall of said cylinder.
Claim 8
Dependent Claim
30 words
A solenoid valve according to claim 6, wherein a gap between said piston valve and said inner wall of said cylinder is within a range of 0.02 to 0.10 mm.
Claim 9
Dependent Claim
22 words
A solenoid valve according to claim 1, wherein said pulse signal has a frequency within a range of 10 to 50 Hz.
Claim 10
Dependent Claim
60 words
A solenoid valve according to claim 5, wherein said piston valve is provided with an escape hole for enabling a space defined by an upper outer surface of said piston valve and an inner wall of said cylinder to communicate with a space defined by a lower outer surface of said piston valve and the inner wall of said cylinder.
Claim 11
Dependent Claim
36 words
A solenoid valve according to claim 2, wherein said aperture means includes a plurality of apertures axially provided in said cylinder and an aperture provided in said piston valve for communicating with one of said apertures.
Claim 12
Dependent Claim
41 words
A solenoid valve according to claim 2, wherein said aperture means includes a plurality of apertures circumferentially provided in said cylinder and a plurality of apertures circumferentially provided in said piston valve for communicating with said apertures provided in said cylinder.
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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) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |