| 摘要 |
PURPOSE:To surely prevent any reverse flow of water by forming a flat face part making contact with a valve seat at the lower part of an approximately columnar check valve which slides along a projecting guide rail. CONSTITUTION:A valve seat hole 10 having a valve seat 9 is formed between a ball valve chamber 5 and a check valve chamber 8. Several projecting guide rails 12 between which respective water channels 11 are formed are formed on the inwall of the check valve chamber 8 and an approximately columnar check valve 13 which slides along said guide rails is housed in the check valve chamber 8. A flat face part 14 formed on the lower part of the check valve 13 makes content with the valve seat 9. When water flows reversely, the flat face part 14 at the lower part of the check valve 13 makes contact with the valve seat 9 to close the valve seat hole 10.
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