Fluid handling – Systems – Supply and exhaust
Patent
1975-06-09
1978-01-10
Cohan, Alan
Fluid handling
Systems
Supply and exhaust
13759615, 13759618, 13762566, F15B 13043
Patent
active
040673570
ABSTRACT:
A sliding-spool direction control valve wherein the valve body has a central space for a center land which is rigid with the shank of the valve spool. The outer lands of the spool have axially extending recesses for the respective end portions of the shank. The center space is disposed between two seats and communicates with a pressure port flanked by two working ports which, in turn, are flanked by two return ports. The outer lands are disposed between the respective working and return ports and are connected with pistons which are movable in the valve body to thereby shift the spool so that the center land engages the one or the other seat. The movements of spool can be initiated by a single electromagnetic pilot valve or by two discrete pilot valves.
REFERENCES:
patent: 3608587 (1971-09-01), Zbell
patent: 3902526 (1975-09-01), Brake et al.
Cohan Alan
Herion-Werke KG
Michalsky Gerald A.
Striker Michael J.
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