| 摘要 |
PURPOSE:To correct operation of a gas control valve is response to variation in temperature of hot water flowing in a body by a method wherein a pressure differential plate operated under a pressure difference between a primary side pressure and a secondary side pressure is provided, the pressure differential plate is connected to a gas control valve, an opening or closing valve is installed in a bypass passage pipe communicating the primary side with the secondary side and a degree of opening of the opening or closing valve is varied under a thermo-sensitive operation of a thermostat. CONSTITUTION:As a temperature of hot water flowing in a flow passage (a) is varied, an opening or closing valve 8 arranged in a bypass passage 7 may vary a degree of opening under a thermo-sensitive operation of a thermostat TH and then varies an amount of hot water flowing in the passage 7. Since an amount of discharged hot water from the hot water outlet port 11 is kept constant, a variation in amount of hot water flowing in the pipe 7 becomes a variation in amount of hot water flowing in a pipe 31, a pressure differential plate 3 may perform a pressure sensing action, a gas control valve 6 is moved in response to the pressure sensitive action, and an increase or decrease in combustion calorie of the gas is controlled in response to the temperature of hot water while an amount of discharged hot water from the hot water is kept constant. |
