| 摘要 |
<p>PURPOSE: To reduce erroneous operation and improve sealing effect by arranging a sliding plate with a through hole movable up and down between two packing discs having two upper and lower connecting holes. CONSTITUTION: Two packing discs 4a, 4b are mounted in a casing 1. A sliding plate 6 is arranged movable up and down between them. A pipe connecting opening 10 is formed on the left side of the casing 1 and pipe connecting openings 9, 9 are formed on the right side thereof. Two connecting holes 11 separated form each other by a control space A are formed in the packing discs 4a, 4b and a through hole 12 is formed in the sliding plate 6. The control space A is larger than the diameter D of the through hole 12. The communication state of the pipe connecting opening 10 and the pipe connecting openings 9, 9 is switched by moving the sliding plate 6 up and down. It is possible to reduce erroneous operation and improve sealing effect with this structure.</p> |
