Patent US3695577A successfully refreshed from Google Patents.
US3695577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve, particularly a thermostatic expansion valve for refrigerating equipment
Assignee: Danfoss AS
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Filing: 1970-11-16
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Granted: 1972-10-03
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Expires: 1990-11-16
Abstract
Abstract The invention relates to a thermostatic valve or the like of the type in which a spindle having a valve closure element at one end thereof is acted upon in one direction by a pressure responsive element and is biased in the other direction by a spring. The spindle is provided with screw threads and the spring which is conically shaped, has a coil portion complementary to and threadably engageable with the screw threads. The tension of the spring is adjusted by rotation of the spindle with a screwdriver or wrench depending on the type of tool engaging fitting the spindle is provided with at the lower end thereof.
Inventors
- 👤 Hans Jorgen Jespersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:23
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/33; F25B41/335
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A thermostatic expansion valve or the like comprising a casing having inlet and outlet ports, valve means for one of said ports having a valve seat and a valve closure member, a movable operating element, a spindle having one end thereof in abutting engagement with operating element, said spindle having screw threads, spring means having a coil portion complementary to and threadably engageable with said screw threads, said valve closure member being connected to said spindle, said spindle being movable in one direction by said operating element and biased in the opposite direction by said spring means, adjustment means for turning said spindle to adjust the tension of said spring means, and fastening means for preventing rotation of one end of said spring means relative to said casing.
Claim 2
Dependent Claim
128 words
A thermostatic expansion valve or the like comprising a casing having inlet and outlet ports, valve means for one of said ports having a valve seat and a valve closure member, a movable operating element, a spindle having one end thereof in abutting engagement with operating element, said spindle having screw threads, spring means having a coil portion complementary to and threadably engageable with said screw threads, said valve closure member being connected to said spindle, said spindle being movable in one direction by said operating element and biased in the opposite direction by said spring means, adjustment means for turning said spindle to adjust the tension of said spring means, and fastening means for preventing rotation of one end of said spring means relative to said casing.
Claim 3
Dependent Claim
32 words
A thermostatic expansion valve or the like according to claim 1 wherein said fastening means comprises a recess in said casing and a hook on said spring means disposed in said recess.
Claim 4
Dependent Claim
50 words
A thermostatic expansion valve or the like according to claim 2 wherein said recess is in a casing surface which is normal to said spindle, said hook having an inclined portion which is inclined relative to said surface and a terminal end portion which is generally parallel to said surface.
Claim 5
Dependent Claim
20 words
A thermostatic expansion valve or the like according to claim 1 wherein said spring means has a generally conical shape.
Claim 6
Dependent Claim
25 words
A thermostatic expansion valve or the like according to claim 1 wherein said spindle has a section of reduced diameter adjacent said screw threads thereof.
Claim 7
Dependent Claim
25 words
A thermostatic expansion valve or the like according to claim 1 wherein said adjustment means and said valve closure member comprise a single integrated element.
Claim 8
Dependent Claim
57 words
A thermostatic expansion valve or the like according to claim 1 wherein said casing includes a cylindrically shaped section surrounding said spindle, an annular cup-shaped element having a central sleeve portion mounted in said cylindrically shaped section, said spring means being nested in said cup-shaped element and said sleeve portion thereof forming a guide for said spindle.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |