| 摘要 |
PURPOSE:To save the labor of piping work by constituting the subvalve of a solenoid valve incorporated in a constant head valve, and opening and closing a by-pass waterway between primary side and secondary side by the solenoid valve. CONSTITUTION:When a solenoid valve 16 makes opening operation, a diaphragm chamber 11 communicates with a discharge port 6 of secondary side through a water channel 12a, passages 13b, 13c of a control flow register 13, a communication passage 14 and a by-pass water channel 15. In such a case, passages 13b, 13c in the control register 13 are larger in diameter than that of a passage 13a which is in inflow side, and accordingly, a diaphragm 9 moves upward resisting a spring 10, and a valve 7 is opened, and water is drained into a water receiving tank through a discharge pipe 3. On the other hand, when the solenoid valve 16 makes opening operation, pressure in the diaphragm chamber 11 becomes equal to water supply pressure. Accordingly, the diaphragm 9 is pressed by the spring 10 and the valve 7 is closed, and discharge of water from the discharge pipe 3 is stopped. |
