Fluid handling – Systems – Multi-way valve unit
Patent
1972-10-10
1976-10-05
Cohan, Alan
Fluid handling
Systems
Multi-way valve unit
F15B 13043
Patent
active
039839087
ABSTRACT:
A control valve has a stepped cylinder and piston having at one end a small iameter end face forming an end chamber, and also a large diameter annular face forming an annular chamber at the end. The other end of the piston has a large diameter end face forming a large diameter chamber. A high pressure pump conduit, a low pressure discharge conduit and a variable pressure consumer conduit have cylinder ports cooperating with the stepped piston, and the consumer conduit has a branch conduit opening in the annular chamber. The piston is movable between the neutral position closing the conduits and two operative positions for connecting the pump conduit with the consumer conduit or with the discharge conduit. A fluidic amplifier has an inlet connected with the pump conduit and two outlets, one of the outlets opening in the small diameter end chamber so that the consumer conduit pressure and the pressure of this outlet together act on the piston in one direction, and the other outlet opening in the large diameter pressure chamber so that the pressure of the other outlet acts on the piston in the opposite direction. The fluidic amplifier is shiftable between a neutral position in which the pressure at the outlets are equal, and two control positions in which the pressures at said outlets are different. When the fluidic amplifier is placed in one of the control positions by an electromagnet, the piston is displaced to one of the operative positions thereof until equilibrium between the pressure forces acting in opposite directions at the ends of the piston is obtained at a desirable pressure in the consumer conduit.
REFERENCES:
patent: 2954794 (1960-10-01), Paine
patent: 2964059 (1960-12-01), Geyer
patent: 3405735 (1968-10-01), Adams
patent: 3486801 (1969-12-01), Frayer
patent: 3680596 (1972-08-01), Pickett
Cohan Alan
Indramat-Gesellschaft fur Industrie-Rationalisierung und Automat
Michalsky Gerald A.
Striker Michael J.
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