Fluid handling – Systems – Multi-way valve unit
Patent
1977-03-24
1978-01-03
Nilson, Robert G.
Fluid handling
Systems
Multi-way valve unit
91 52, F16K 3142
Patent
active
040661032
ABSTRACT:
The invention relates to a hydraulic regulator of a type which may be operated by electromagnetic switching valves. The assembly includes a piston and cylinder arrangement with position setting chambers at opposite ends thereof of larger diameter than the servo piston. Movable abutment elements in the chambers of larger diameter than the servo piston are biased by centering springs. There are parallel circuit branches in which the end chambers are disposed and switching valves are in these branches. The actuating of one of the valves to block its branch lower the pressure in the end chamber in that branch causing the piston to move towards the blocked branch so as to move away from the biasing force of the opposite spring biased element and engage the biasing force of the adjacent spring biased element. When the other switching valve is actuated to block its branch to stop the piston in a desired position, the fluid pressure in the end chambers is equal. The spring bias acting through one of the abutment elements creates unequal biasing forces on the servo piston in the direction from which it started.
REFERENCES:
patent: 2800143 (1957-07-01), Keller
patent: 3537355 (1970-11-01), Bliss
patent: 3799202 (1974-03-01), McAvoy
Danfoss A/S
Nilson Robert G.
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