| 摘要 |
<p>Butterfly valve with double sealing intended to equip a hydraulic pipe equipping a hydroelectric installation. It comprises an elastic guard seal (safety seal) 7 of the "musical note" type whose tail 71 is held in the body 2 of the valve so that the said seal is usually in the retracted position. The body 2 is equipped with a mechanical device 12, 14 for centripetally pushing the guard seal (safety seal) 70 towards its seat 8 on the disc-shaped flap (lens) 1 of the butterfly valve. <IMAGE></p> |
