| 摘要 |
<p>PURPOSE:To precisely control the pressure of a hot water device by providing a pressure reducing valve and a safety valve on the way of a feed water tube of the device, disposing a pressure sensor at the downstream side of the reducing valve and controlling the safety valve on the basis of the detected value of the sensor. CONSTITUTION:A safety valve R is provided in a discharge tube R1 branched from a feed water tube I, and a valve body R2 is composed of a diaphragm valve. A latching solenoid R4 is employed as an actuator for driving a pilot valve body R3 to perform a binary operation of full open and full close. When it is once fully opened, a closure signal is input from a controller C, or it holds a fully open state until it is reset. When a feed water pressure becomes abnormally high, the valve R is opened to externally discharge the water in the feed water tube to lower the feed water pressure, thereby providing safety. When a pressure sensor S detects an abnormal pressure, a control signal is output to the solenoid R4 according to a control program stored in advance in the controller C to open the valve R, and closes the valve when the abnormal pressure is returned to the normal state.</p> |
