| 摘要 |
PURPOSE: A frost protection device for a water meter is provided to prevent a water meter from touching external air by installing the water meter inside a vacuum tank. CONSTITUTION: A frost protection device for a water meter comprises a vacuum tank(2) and a vacuum valve(10a). A water meter(1) is installed inside the vacuum tank, and the vacuum tank is sealed to prevent the installed water meter from touching external air. The vacuum tank is installed on one side of the vacuum tank and vacuumizes the inside the vacuum tank. |
