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US4291716A Expired / Lapsed US ⏱️ 0.0 years remaining

Pilot stage valve

Assignee: Danfoss Power Solutions Inc
•
Filing: 1977-05-13
•
Granted: 1981-09-29
•
Expires: 1997-05-13
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Abstract

Abstract A pilot stage valve is disclosed having a control mechanism for moving an actuating arm in response to an input signal, a jet pipe moved by the actuating arm for issuing a jet of fluid, a sandwich constructed receiver having a first receiver plate and a second receiver plate, each having a groove in the surface thereof facing each other with a splitter plate between the first and second receiver plates, the first and second grooves receiving a differential amount of fluid dependent upon the position of the jet pipe with respect to the splitter plate, the grooves being connected to respective outlet ports. The control mechanism comprises a magnetic operator having a generally U-shaped frame comprising first and second arms each having first and second ends and a cross-piece attaching the first ends of the first and second arms together, a first rare earth magnet attached to the second end of the first arm, a second rare earth magnet attached to the second end of the second arm, an armature attached to the cross-piece of the frame and extending between the magnets, a coil wound around the armature, and a means for attaching the armature to the actuating arm of the pilot stage valve.

Inventors

  • 👤 Dwayne R. Elmberg

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 12:30
CPC Classifications
F; F15; F15C; F15C3/00; F15C3/10; F15C3/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2322

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 170 words
A pilot stage valve for connecting fluid from an inlet port to first and second outlet ports comprising: control means for moving an actuating means in response to an input signal; a jet pipe connected to said inlet port and attached to said actuating means for issuing a jet of fluid; and, receiver means for receiving said jet of fluid, said receiver means comprising a sandwich construction of a first receiver plate having a first opening for communicating said jet of fluid to said first outlet port, a second receiver plate having a second opening for communicating said jet of fluid to said second outlet port, and, a splitter plate between said first and second receiver plates, said splitter plate having an extension therefrom and attached to said jet pipe for preventing lateral movement of said jet pipe with respect to said receiver means; wherein said first and second openings receive a differential amount of fluid dependent upon the position of said jet pipe with respect to said splitter plate.
Claim 2
Dependent Claim 170 words
A pilot stage valve for connecting fluid from an inlet port to first and second outlet ports comprising: control means for moving an actuating means in response to an input signal; a jet pipe connected to said inlet port and attached to said actuating means for issuing a jet of fluid; and, receiver means for receiving said jet of fluid, said receiver means comprising a sandwich construction of a first receiver plate having a first opening for communicating said jet of fluid to said first outlet port, a second receiver plate having a second opening for communicating said jet of fluid to said second outlet port, and, a splitter plate between said first and second receiver plates, said splitter plate having an extension therefrom and attached to said jet pipe for preventing lateral movement of said jet pipe with respect to said receiver means; wherein said first and second openings receive a differential amount of fluid dependent upon the position of said jet pipe with respect to said splitter plate.
Claim 3
Dependent Claim 23 words
The pilot stage valve of claim 1 wherein said extension of said splitter plate and said splitter plate are of a unitary construction.
Claim 4
Dependent Claim 24 words
The pilot stage valve of claim 2 wherein said splitter plate and said extension are formed by a stamped or etched sheet of metal.
Claim 5
Dependent Claim 23 words
The pilot stage valve of claim 3 wherein said extension has a clip at the end thereof for attachment to said jet pipe.
Claim 6
Dependent Claim 48 words
The pilot stage valve of claim 4 wherein said clip is formed by a V-shaped notch in the end of said extension and by an aperture of the apex of said V, said clip being bent over said jet pipe until said jet pipe snaps into said aperture.
Claim 7
Dependent Claim 23 words
The pilot stage valve of claim 1 wherein said extension has a clip at the end thereof for attachment to said jet pipe.
Claim 8
Dependent Claim 48 words
The pilot stage valve of claim 6 wherein said clip is formed by a V-shaped notch in the end of said extension and by an aperture at the apex of said V, said clip being bent over said jet pipe until said jet pipe snaps into said aperture.

References Cited (Backward Citations)

US3528446A Cited
US3561476A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-09-28 1985-03-30 1985-09-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-09-28 1989-03-30 1989-09-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-09-28 1993-03-30 1993-09-29 $7700.00 Window Closed / Lapsed

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