Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1988-12-21
1990-05-08
Michalsky, Gerald A.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
123323, 13762568, 188273, 251205, 251325, 251900, F16D 6300, F15B 1304, F02D 906
Patent
active
049231677
ABSTRACT:
A slide valve for fluid wherein a slide (3) is axially reciprocally movable in a housing chamber (2) of a valve housing (1). A housing channel (7) in the valve housing (1), which housing channel communicates with a first external connection (8), is provided with a recess (16) directed toward the slide (3) and the piston (3) has a slide channel (14) which communicates with a second external connection (11) via a further recess (15). The slide valve is designed such that passage of fluid does not become blocked by impurities in the fluid, and the slide valve is capable of fine-variability. This is achieved in that the upstream recess (16) has a cross-section which narrows in the direction of the slide valve axis toward the housing channel (7) when the slide (3) is in the closed position. In order to achieve finely variable dosage regulation by the slide valve, the upstream recess (16) has variable cross-section, as the slide (3) is moved in the housing chamber (2).
REFERENCES:
patent: 3138175 (1964-06-01), Chilcoat
patent: 3987999 (1976-10-01), Savage
patent: 4111166 (1978-09-01), Alstrin et al.
patent: 4705069 (1987-11-01), Fertig
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