Patent ID: 7055798
Filing Date: 2006-06-06
Classification: F16K,G05D

Abstract:
1. A proportional solenoid control valve comprising: a solenoid; a magnetic movable member having a magnetic attraction force applied by the solenoid; and a flat spring for engaging an outer periphery section of the flat spring with a non-magnetic cylindrical member for guiding the magnetic movable member, and for engaging an inner periphery section of the flat spring with the magnetic movable member so as to balance in power with the magnetic movable member due to the magnetic attraction force, the flat spring including a flat square spring which has cutouts at an inner side of four corners thereof so as to obtain uniform deformation displacement, and which is strong and is wide in spring constant maintaining width with respect to the spring displacement, the flat square spring having a PTFE coating on a supporting point side face.