To provide an automatic water level control apparatus for a water storage tank that can prevent chattering.
The automatic water level control apparatus 4 for a water storage tank comprises a feed valve 40 comprising a piston valve, a first pilot valve 10 and a second pilot valve 20 both comprising a float valve, and a third pilot valve 30. The first pilot valve 10 opens a first outflow pipe 47 of a cylinder 41 of the feed valve 40 when the water level of a water storage tank 1 is below a first set water level L1, and closes the first outflow pipe 47 when the water level is equal to or higher than the first set water level L1. The second pilot valve 40 opens a second outflow pipe 48 of the cylinder 41 of the feed valve 40 when the water level is below a second set water level L2 higher than the first set water level L1, and closes the second outflow pipe 48 when the water level is equal to or higher than the second set water level L2. The third pilot valve 30 closes the second outflow pipe 48 when the first outflow pipe 47 and the second outflow pipe 48 are closed, and opens the second outflow pipe 48 when the first outflow pipe 47 and the second outflow pipe 48 are opened.
| JPS5854218 | [Title of the Invention] A puncturing method and a device of a tank |
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| JP2004285813 | BALL TAP BOX WITH FLOAT |
OTAKA NORIO
Ken Takada
Kurose Yasuhisa
Yoshihito Shimizu
Toshiya Kido