Patent ID: 7565915
Filing Date: 2009-07-28
Classification: F16H,F16K,Y10T

Abstract:
1. A pilot-controlled pressure feed valve, comprising: a piston of a main stage, the piston being penetrated by a piston bore and capable of controlling a connection between an input port and an output port to be open; a spring chamber adapted to be connected with the input port via the piston bore and with a control oil drain via a pilot control stage, and a throttle valve means which throttles a control oil flow in a first direction through the piston bore from the input port into the spring chamber according to a pressure-limiting function, wherein the throttle valve means controls open a comparatively large cross-section of flow in an anti-cavitation function in the event of a control oil flow in a second direction that opposes the first direction, and wherein the throttle valve means is a throttle check valve having a nozzle plate which is penetrated by a nozzle bore having a smaller diameter than the piston bore, and which is adapted to be taken with an end face thereof into contact with a nozzle plate seat, wherein the nozzle bore may be bypassed by a flow around said nozzle plate in a condition where the nozzle plate is raised from the nozzle plate seat.