The gas pressure reducing valve's blade is too thin and can fail. The screws on the top and bottom covers of the valve body are not tightened. The rubber membrane inside the valve is damaged. The intake seal is aging and worn out. The operation of the pressure reducing valve is controlled by the pressure after the valve. When the pressure sensor detects an increase in the valve pressure indication, the opening of the pressure reducing valve decreases. When the pressure after the pressure reducing valve is detected to decrease, the valve opening increases to meet the control requirements.