Valve arrangement in a hydraulic circuit, use of the same...

Details Valve arrangement in a hydraulic circuit, use of the same... Valve arrangement in a hydraulic circuit, use of the same...

2006-10-17

2006-10-17

Keasel, Eric (Department: 3753)

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

C137S489500, C137S493700, C251S063600, C060S466000

Reexamination Certificate

active

07121297

ABSTRACT:
Arranged in a hydraulic circuit is a valve with an L-shaped duct arrangement, which is formed by a transverse duct2and a longitudinal duct3. Formed in extension of the longitudinal duct3is a holding and guiding bore4, in which a throttling element, comprising a throttle slide10and a valve piston21that can be displaced therein, can be displaced longitudinally. The valve piston21has a passage hole25, which is connected to the interior of the throttling element and two proportionate annular chambers17aand17b. Of these, the proportionate annular chamber17bis connected to a pilot control valve via a control duct19. Depending on the direction and pressure of the hydraulic fluid flowing through the L-shaped duct arrangement, the throttling element is moved in or out and extended or compressed in the process. In this way, the valve arrangement acts as a throttling valve in the event of flow in the direction from the transverse duct2to the longitudinal duct3, while the flow in the opposite flow direction is not throttled.

REFERENCES:
patent: 1091536 (1914-03-01), Ross
patent: 3044485 (1962-07-01), Adams et al.
patent: 5167291 (1992-12-01), Mann
patent: 6338247 (2002-01-01), Drin

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