Druckentlastungsventil für Hydraulikfluid.

摘要

This invention relates to a relief valve for controlling the pressure of a hydraulic fluid within a first duct (30) opening into a bore (14,16) provided in a housing (12), a communication between said first duct (30) and a second duct (34) connecting a primary hydraulic circuit under pressure to said bore (14,16) being provided in rest position of a valve member when the pressure within said first duct (30) is lower than a threshold determined by the preload of a resilient means urging said valve member in rest position, said communication being interrupted when said pressure in said first duct (30) sensibly reaches said threshold. According to the invention, an increase of said pressure in said first duct beyond said threshold results in providing a communication between said first duct (30) and a third duct (38) connected to a low pressure circuit.