| 摘要 |
PURPOSE:To enable a valve to be operated certainly even when a vast number of discharge openings are provided densely thereon by laminating a plurality of plate-type valve elements on a plurality of discharge opening rows, and then attaching them in such a manner that each piece is independent each other. CONSTITUTION:A check valve 11 is made up of laminated-plate-type valve elements, in which the inner layer of plate-type valve element 12, the intermediate layer of plate-type valve element 13 and the outer layer of plate-type valve element 14 are laminated in the direction of discharge so that they correspond to the rows of discharge opening 10. Each of these valve elements 12, 13, 14 is made of an elastic material, and formed into a fork-like shape, in which four pieces of flap, consisting of a supporting part 16 and a sealing part 17, are extended from its broad bottom part 15. In addition, the sealing part 17 of each of these valve elements 12, 13, 14 is formed into the stream-line shape. And further, each valve element is attached in such a manner as to open and close independently, and accordingly, it is possible for one valve element to open upto a preset opening certainly without being interfered with any other valve elements.
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