| 摘要 |
A valve system is provided where the water supplier can change the mode of operation between a full free flow through the valve and a limited trickle flow, so that the user will not be left without any water should the supplier decide that the supply of water to a person should be cut off; the valve comprising a casing with a rotatable member, the member having passageways at right angles, one passageway allowing full free flow through the valve and the other passageway including a restriction with an orifice determined by the rate of trickle flow sought, and having a filter upstream thereof for prevention of clogging of the orifice; the valve also providing additional modes, one of which provides for a complete shut off of water, another providing a flush of the valve and another providing a back washing action for cleaning the filter. |
