Patent ID: 7246635
Filing Date: 2007-07-24
Classification: F16K,G05D,Y10T

Abstract:
1. An automatic control valve for stabilising the flow rate of a hydraulic fluid, comprising: a tubular valve body defining an inner flow passage between at least one inlet aperture and an outlet aperture of the tubular body; a flow control piston, axially movable within said tubular body; and a biasing spring to urge the control piston in an open condition against the pressure of the fluid, wherein said inlet aperture extends completely through a side wall of said valve body from the inner flow passage to an exterior of said valve body, said inlet aperture extending longitudinally in the valve body towards the fluid outlet end; and wherein the control piston comprises a cup-shaped element slidably movable between the outer wall of the valve body and a coaxially arranged guide member having a wall which extends from the fluid outlet end into the piston member; said piston member and guide member defining a damping chamber being in communication with said inner flow passage.