| 摘要 |
<p>A double seat valve has two serially arranged closure members (5, 6) that are movable with respect to each other, that prevent in the closed position of the valve fluids from overflowing from a first part (1a) into a second part (1b) of the valve housing, and that delimit both in the closed and in the open position a leakage cavity (3) in communication with the surroundings of the valve through a pipe (5b) linked to the independently driven first closure member (5) and that extends outwardly through the adjacent first part (1a) of the valve housing. Valve rods (5a, 6a) for the closure members (5, 6) that are concentrically arranged inside each other extend unilaterally outwards through the second part (1b) of the valve housing. The disclosed double seat valve satisfies the requirement for a leakage cavity that can not only be drained, but also pressure-relieved in all imaginable operating conditions. For that purpose, the valve rod of the second closure member (6), designed as a hollow rod (6a), inwardly delimits a part (6d) of a connection path (15) which is enlarged up to a throughflow cross-section (Q) immediately after the leakage cavity (3) and in a part of its ulterior course, thus increasing the space available for the leakage cavity (3).</p> |
