| 摘要 |
<p>PCT No. PCT/DK95/00290 Sec. 371 Date Jan. 6, 1997 Sec. 102(e) Date Jan. 6, 1997 PCT Filed Jul. 6, 1995 PCT Pub. No. WO96/01964 PCT Pub. Date Jan. 25, 1996A shut-off valve (1, 101) including a valve housing (2, 102) having a flow passageway (3, 103); a shut-off member (22, 122) displaceably arranged in the housing between an open position and a closed position of the valve flow passageway through an actuator device (15, 115). The actuator device includes a nut member (20, 120) provided with an internal thread (21, 121) having a first thread pitch, and an outer stem member (17, 117) provided with an external thread (19, 119) engaging the internal thread (21, 121) of the nut member, and with an internal thread (18, 118) (21, 121) with a second pitch differing from the first pitch and engaging a corresponding external thread (12, 112) on an inner stem member (6, 106). The threads coacting during the major part of the closing movement of the shut-off member (22, 122) are provided with larger pitch than those coacting during the final part of the closing movement. First coacting stop elements (28, 29; 128, 129) are provided between the two members interengaged by the threads with the largest pitch, the stop elements being adapted to engage each other at the end of the closing movement to ensure a joint turning of the two members in relation to the third member during the final part of the closing movement.</p> |
