ROTARY-VALVE SWITCHING DEVICE

摘要

PURPOSE:To reduce the revolution torque for driving an output shaft and a rotary valve by fixing the opened port of a bag-shaped member free from the leak of fluid onto a case or a housing and covering a permanent magnet rotor. CONSTITUTION:A rotary valve piece 7a is revolution-driven by an exciting coil 2 and a fixed magnetic pole 3 which are accommodated into a case 1 integrally fixed with the housing 9 of the rotary valve 7a. The opened port of a bag-shaped member 12 free from the leak of fluid is fixed onto the case 1 or the housing 9, and covers a permanent magnet rotor 6. With such constitution, certain seal is permitted without installing an O-ring, and the revolution torque for driving an output shaft and a rotary shaft can be reduced.