US4372486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible expansion valve
Assignee: Saginomiya Seisakusho Inc
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Filing: 1981-04-22
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Granted: 1983-02-08
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Expires: 2001-04-22
Abstract
Abstract An electrically operated reversible expansion valve. It has a valve body formed with a primary port, a secondary port, a valve seat defined between the primary and secondary ports, and a slide bore in an opposing relation to said valve seat. A valve needle is supported by the slide bore. In order to prevent the fluid from being admitted into a bimetal chamber through the slide bore, a bypass is provided between the primary port and the slide bore.
Inventors
- 👤 Soichiro Tomioka
- 👤 Yasuo Komiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:16
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/34; F25B41/355; Y; Y02; Y02B; Y02B30/00; Y02B30/70; Y10; Y10T; Y10T137/00; Y10T137/5762; Y10T137/7722; Y10T137/7837; Y10T137/7847
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A reversible expansion valve comprising a valve body formed with a primary port, a secondary port, a valve seat defined between the primary and secondary ports, and a slide bore in an opposing relation to said valve seat; a valve needle inserted through said slide bore and adapted to engage the valve seat; a control chamber accommodating a control means therein to regulate the valve needle; and means for protecting against fluid leakage into said control chamber, comprising a communication passage provided between said primary port and said slide bore and having a check valve therein.
Claim 2
Dependent Claim
96 words
A reversible expansion valve comprising a valve body formed with a primary port, a secondary port, a valve seat defined between the primary and secondary ports, and a slide bore in an opposing relation to said valve seat; a valve needle inserted through said slide bore and adapted to engage the valve seat; a control chamber accommodating a control means therein to regulate the valve needle; and means for protecting against fluid leakage into said control chamber, comprising a communication passage provided between said primary port and said slide bore and having a check valve therein.
Claim 3
Dependent Claim
25 words
A reversible expansion valve according to claim 1, wherein said means for protecting against fluid leakage includes a discharge passage bored in the valve body.
Claim 4
Dependent Claim
27 words
A reversible expansion valve according to claim 2, further including an auxiliary discharge passage bored in the valve body between the bimetal chamber and said discharge passage.
Claim 5
Dependent Claim
41 words
A reversible expansion valve according to claim 1, wherein said means for protecting against fluid leakage includes a piping provided outside the valve body and having an auxiliary valve body at an intermediate part thereof to accommodate the check valve therein.
Claim 6
Dependent Claim
51 words
A reversible expansion valve according to claim 1, wherein said means for protecting against fluid leakage includes an axially extending discharge passage bored in the valve needle, said valve needle having a laterally extending passage bored therein to provide fluid communication between the slide bore and said axially extending discharge passage.
Claim 7
Dependent Claim
27 words
A reversible expansion valve according to claim 1, wherein said means for protecting against fluid leakage includes an opening in an inner wall of the slide bore.
Claim 8
Dependent Claim
17 words
A reversible expansion valve according to claim 1, wherein said control means includes a bimetal control member.
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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) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |