| 摘要 |
<p>PURPOSE: To provide an improved butterfly valve of simple, low-cost structure disassembled and reassembled rapidly and easily and operated safely and positively. CONSTITUTION: One end of a butterfly stem 4 is operated by an operating lever 6 to open/close an internal port of an annular valve element 1. A sealing member 2 is disposed in the annular valve element 1 and brought into close contact with a butterfly 3 in the valve closed position. The sealing member 2 is shaped to require small valve closing force. The butterfly 3 is provided with a means for preventing nipped pills or the like from being broken. The operating lever 6 impedes opening/closing of a butterfly valve unless locking systems 33, 35 are operated by an operator.</p> |
