| 摘要 |
A changeover valve is disclosed; this valve has a valve case which has a water intake to be connected to a water supply device, a water outlet, a drain port, and two connecting ports to be connected to the two opposite ports on a water filter; a valve body which comprises an inner cylinder, an outer cylinder, an internal passage way defined between said inner and outer cylinders, an intake hole communicating the inner cylinder and the water intake of the valve case, a first passage way for connecting the inner cylinder to the space outside the outer cylinder, and a second passage way for connecting the internal passage way to the space outside said outer cylinder; and a control knob to rotate said valve body to "filtration", "rinsing" or "backwashing" position alternatively. Water from the water supply is filtered through the water filter and discharged through the water outlet of the valve case for service when at "filtration" position. Water from the water supply is guided through the water filter to wash the inner part of the water filter and then discharged through the drain port on the valve case when at "rinsing" position. Water from the water supply is guided through the water filter in a reverse direction for back-washing the water filter and then discharged out of the changeover valve through the drain port when at "backwashing" position.
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