Patent ID: 6283145
Filing Date: 2001-09-04
Classification: G05D,Y10T

Abstract:
A proportional control gas valve comprising:a valve body formed with an inlet having a first orifice, a first chamber communication with said inlet through said orifice, a second chamber formed with a balancing orifice and a second orifice, a third chamber in communication with said first chamber through said balancing orifice, a fourth chamber in communication with said fist chamber via said second orifice, a fifth chamber in communication with said fourth chamber, and an outlet in communication with said fifth chamber;a solenoid assembly mounted in said first chamber for controlling gas flowing from said first chamber to said fourth chamber via said second orifice;a main diaphragm arranged between said inlet and said third chamber;a valve spring mounted under said main diaphragm and urging said main diaphragm to move upwardly to close a passage from said inlet to said outlet;a regulation diaphragm mounted inside said fifth chamber;a regulation spring mounted on said regulation diaphragm;an adjust stem connected with said regulation diaphragm for controlling gas flow rate from said fourth chamber to said outlet; and a servomotor drivingly connected with said adjust stem.