| 摘要 |
PURPOSE:To achieve reliable work and to improve assembling work by fitting an auxiliary operating board idly to a rotary shaft of main valve then inserting the main valve rotary shaft through a bearing fitted in the groove of cover to use as an upper limit stopper for main valve and auxiliary operating board. CONSTITUTION:A rotary shaft 28b is projected from main valve 28 while a bearing 44 is engaged with bearing groove section 41a in the cover 41. Said shaft 28b is inserted through a bearing 44 while inserted with an auxiliary operating board 30. Auxiliary operating board 30 is holding a ball valve 31 in the containing section 30a where the communication hole 29a through the seat 29 is sealed by the ball valve 31 and when moving main valve, said hole 29a is opened to cancel pressure difference. Upward motion of main valve and auxiliary operating board is limited by the bearing 44 to provide reliable and safe rotation. |
