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A proportional control gas valve includes a valve body formed with an inlet having a first orifice, a first chamber communication with the inlet through the orifice, a second chamber formed with a balancing orifice and a second orifice, a third chamber in communication with the first chamber through

A proportional control gas valve includes a valve body formed with an inlet having a first orifice, a first chamber communication with the inlet through the orifice, a second chamber formed with a balancing orifice and a second orifice, a third chamber in communication with the first chamber through the balancing orifice, a fourth chamber in communication with the first chamber via the second orifice, a fifth chamber in communication with the fourth chamber, and an outlet in communication with the fifth chamber, a solenoid assembly mounted in the first chamber for controlling gas flowing from the first chamber to the fourth chamber via the second orifice, a main diaphragm arranged between the inlet and the third chamber, a valve spring mounted under the main diaphragm and urging the main diaphragm to move upwardly to close a passage from the inlet to the outlet, a regulation diaphragm mounted inside the fifth chamber, a regulation spring mounted on the regulation diaphragm, an adjust stem connected with the regulation diaphragm for controlling gas flow rate from the fourth chamber to the outlet, and a servomotor drivingly connected with the adjust stem, whereby the proportional control gas valve only requires a small amount of energy to control the gas pressure and flow rate simultaneously.

대표청구항 ▼

[ I claim:] [1.]1. 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 sa

[ I claim:] [1.]1. 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.