| 摘要 |
PURPOSE:To contrive to stabilize the hot-water supplying temperature over nearly whole range of hot-water supplying quantity by a method wherein at least two valves among the first, second and third throttle valves having respectively different working characteristics are interlocked each other and controlled by manual operation. CONSTITUTION:An automatic throttle device 25 is provided parallel to a Venturi 20, a channel area in the automatic throttle device 25 is increased automatically in accordance with the increasing of water supplying. The furst throttle valve 30 is arranged between the Venturi 20 and the primary chamber 10a, the second throttle valve 31 has a common valve component to the automatic throttle valve device 25, the third throttle valve 32 is communicated with the primary chamber 10a and the secondary chamber 10b, then at least two throttle valves among said three valves are provided. The at least two valves are controlled by manual operation to be interlocked simultaneously the increasing and decreasing of the channel area of those valves. In this case, at the variation of the channel area of the first throttle valve 30, the water supplying quantity-lift characteristic curve is moved approximately parallel, at the decreasing of the channel area of the second throttle valve 31, the characteristic curve is moved toward the less water supplying quantity side, simultaneously, the inclination becomes sharp, further, the characteristic curve due to the third throttle valve 32 is quantitatively similar to that due to the second throttle valve 31, but qualitatively different from the characteristic curve of the second throttle valve 31. |
