Germany BOSCH solenoid valve 
 BOSCH, Germany while the medium pressure valve, main valve to close off. Germany BOSCH solenoid valve normally open solenoid valve, coil, after the suction power, 
 Moving core down, the Vice-pressure valve plug, the Deputy valve closed, the main valve pressure rise inside the cup, when the pressure rose to a certain value, 
 Up and down the main pressure valve, like the cup, due to electromagnetic force, the moving core to promote the main valve cup, the clamping main valve seat, 
 Valve closed. Coil power, the electromagnetic suction is zero, the German Vice-BOSCH solenoid valve plug and moving core role of the spring lift, 
 Deputy valve is opened, the main valve cup of fluid flow out by the Vice-valve, reducing the role of Cup in the main pressure valve, solenoid valve BOSCH, Germany 
 When the main valve to reduce pressure on the cup to a certain value BOSCH Germany solenoid valve, using pressure to push from the main valve cup, 
 Main valve is opened, the media flow.