| 摘要 |
PROBLEM TO BE SOLVED: To prevent abrasion damage of a seal material due to sliding of a valve element in a slide-type three-way valve for a hot water supply system.SOLUTION: A three-way valve V switches a flow channel by rotating a valve element 21 on the same plane in a casing 10. A valve shaft 22 is axially movable, a valve separation cam is disposed between opposed faces of the valve element 21 and a partitioning wall 16, and a valve pressing cam is disposed between opposed faces of the valve element 21 and the casing 10. Cam faces 31, 41 of both cams have high/low position parts, and the valve element 21 is separated from a valve seat by sliding sliders 32, 42 on the cam faces 31, 41. By the contact and separation, the valve element 21 is surely closely brought into contact with the valve seat through the seal material 23 and closes a valve hole in closing the valve, and the seal material 23 moves without keeping into contact with the valve seat and the partitioning wall 16 in transferring from one valve hole 18a to the other valve hole 18b. Thus abrasion damage of the seal material 23 due to sliding of the valve element 21 can be reduced as much as possible.SELECTED DRAWING: Figure 1 |
