| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable constant flow valve preventing generation of noise even when controlling in a region of a small flow rate. SOLUTION: A plurality of throttle grooves (valve parts) 16A and 16B which sequentially operates in accordance with water pressure and are different in opening area are arranged between a valve disc 12 and a support member 13 elastically supporting the valve disc 12. Accordingly, a change in the opening area is made large, thereby not only enhancing a startup characteristic which is important as the constant flow valve but also making an initial pressure of a water line high. Even when a throttling is required to be set considerably small, the stable flow control preventing generation of the noise can be realized by a plurality of valve parts. COPYRIGHT: (C)2005,JPO&NCIPI
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