port 38 via the inlet port joint 37 the electromagnetic valve 11 is a non self absorption valve and can only be closed by the valve pole 22 applying pressure thereon while voltage is applied to the electromagnetic valve 11 if no pressure is applied the electromagnetic valve 11 is closed whereby connecting the air circuit the gas valve control device is changed from a non timing and open state to a timing and open state when the rotating button 5 clockwise rotates from a 0 degree position to a 60 degree position it should be noted that the air circuit must not be disconnected during rotation this is implemented by applying pressure on the electromagnetic valve 11 by the valve pole 22 after the electromagnetic valve 11 is powered due to manufacturing errors of the valve pole 22 the plug bar 34 and the valve body 35 a holding position of the electromagnetic valve 11 may be affected to solve this problem an axial compensation structure formed by the spring 40 and the steel ball 39 on the valve cover 21 effectively ensures that the air circuit is not disconnected during rotation 1 when the rotating button 5 rotates anticlockwise to a 0 degree position the fixing.