Fluid handling – Systems – Multi-way valve unit
Patent
1984-04-13
1985-10-08
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
1376256, 251 3001, F15B 13043
Patent
active
045454094
ABSTRACT:
An electrohydraulic, two-stage, proportional displacement valve comprising an advance (servo) control stage and a main control stage, the main control stage being in the form of a follower piston in which the advance control stage in the form of a second piston is guided. The second advance control piston is rotatable in the main control piston and has control edges, or control surfaces, which are inclined in the form of a helical thread. The main control piston is axially displaceable but is not freely rotatable, whereas the advance control piston is axially fixed and may be rotated around its axis by a stepping motor. Both the advance control piston and the main control piston are centered in their respective movement domains by springs. In order to adjust the position of the control edges (or surfaces) with respect to the two spring-centering mechanisms, a lever is attached to the follower piston which lever has a radial slot, indentation, or fork which engages a pin eccentrically mounted in the housing.
REFERENCES:
patent: 3709257 (1973-01-01), Faisandier
patent: 3722547 (1973-03-01), Kirstein
patent: 3891145 (1975-06-01), Batholdmaus et al.
patent: 4145956 (1979-03-01), Rumrill et al.
Integral Hydraulik & Co.
Michalsky Gerald A.
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