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US 4,066,102 AGranted
Hydraulic regulator
AssigneeDanfoss A/S
InventorNiels Tandrup
Life of this patent
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AssigneeDanfoss A/S
InventorNiels Tandrup
Estimating the term…
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 raises the pressure in the end chamber in that branch causing the piston to move in the other direction so as to move away from the biasing force of one spring biased element and engage the biasing force of the other 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 sring bias acting through one of the abutment elements creates unequal biasing forces on the servo piston in the direction from which it started.
A hydraulic regulator system comprising a slide valve member having end faces, first and second pressure chambers at opposite ends of said valve member bounded in part by said end faces, centering springs in said chambers biasing said valve member towards a neutral position, supply and exhaust lines, first and second parallel lines between said supply and exhaust lines in which said first and second chambers are respectively disposed, a pair of switching valves in said parallel lines for selectively moving said slide valve member in either desired direction, a pair of throttle means in said parallel lines, said switching valves being upstream and downstream from the said chamber in said first parallel line, and said throttle means being in said second parallel line upstream and downstream from the said chamber in said second parallel line.
Dependencies are inferred from the claim text.