| 摘要 |
The invention relates to a sealed cock. This cock is characterised in that it especially comprises a body 1 passed through by a fluid duct 2 and having a valve seat 7; a valve 8 passing through the body 1 which is extended upwardly by a rod 15; a thick bell 9 pressed onto the body 1 with interposition of a metal seal 13 and welding of thin internal lips 15 made at the periphery of the valve body and of the bell 9; a driven ring 27 screwed onto the rod 15 of the valve; means 17, 18, 19 for preventing the rotation of this rod with respect to the bell 9; and magnetic and/or electromagnetic means 26, 29 for rotationally driving the driven ring 27 from the outside of the cock. Application to cocks in the primary circuits of pressurised water nuclear reactors. <IMAGE>
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