ELECTRIC FLUID SERVO VALVE ASSEMBLY AND A MANUFACTURING METHOD OF THE ELECTRIC FLUID SERVO VALVE ASSEMBLY, PROVIDING A HYDRAULIC OUTPUT FEEDBACK SIGNAL TO AN ELECTRICALLY OPERATED PRESSURE CONTROL VALVE FOR A HYDRAULICALLY OPERATED SYSTEM BY A SIMPLIFIED AND INEXPENSIVE METHOD

摘要

PURPOSE: An electric fluid servo valve assembly and a manufacturing method of the electric fluid servo valve assembly are provided to secure a simplified and inexpensive method or unit for providing a hydraulic output feedback signal to an electrically operated pressure control valve for a hydraulically operated system. CONSTITUTION: An electric fluid servo valve assembly comprises a valve body(12), an electric actuator(22), a circuit substrate(38), and a unit for fixing the circuit substrate on a pressure signal port(30). The valve body comprises a fluid inlet passage(14); a fluid outlet passage(16); the pressure signal port communicating with the fluid outlet port; and an obturator(20) movable to control movement between the inlet passage and the outlet passage in connecting the inlet passage to a fluid supply source. The electric actuator is arranged together with the valve body and is workable when electricity is supplied to execute movement of the obturator. The circuit substrate has a pressure sensor where a sensing port is arranged. The circuit substrate is mounted with an eclectic connector terminal(40) of outer connection. The circuit substrate is arranged on the pressure signal port.