| 摘要 |
PURPOSE:To reduce the error in setting the quantity of water, to make the titled device small-sized and to reduce the capacity of the device by a method wherein the number of parts for constituting a water quantity controller is made small. CONSTITUTION:When water is in a standing condition, the gear-like center section 6 of a water heating control device is enclosed by an elastic O-ring 5 leaving a predetermined space from the O-ring. Further, when the water begins to flow, the O-ring 5 is pressed against a pedestral surface 7a of a housing due to the difference in pressure between a valve inlet port chamber 3 and a valve chamber 4 so that the O-ring contracts to shift from a position A to a position B and comes near the top of a large projection 6a and that of a small projection 6b of the gear-like central section 6. In this case, the sectional area E of the flowing water reduces as the abovementioned pressure difference increases. In addition, the sectional area E is so adjusted that the flow rate of the water becomes constant throughout the pressure range by selecting the height and width of each of the projections 6a and 6b and the O-ring 5 and it is possible to obtain a desired quantity of water by moving an adjust shaft 15. |
