| 摘要 |
<p>A gas-tight shut-off valve (14) for a material charging or discharging lock (10) comprises a valve closing element (26) that is movable relative to a valve seat (22), between a first position, in which the valve closing elemen t (26) and the annular valve seat (22) can be axially pressed together, and a second position, in which the valve closing element (26) is located laterall y of the discharge opening (24) in the valve seat (22). A soft sealing means (28) is associated either with the annular valve seat (22) or with the valve closing element (26). The valve (14) further comprises a heat protecting element (30), which is movable between a first position, in which it covers the soft sealing means (28) when the valve closing element (26) is in its second position, and a second position, in which it uncovers the soft sealin g means (28).</p> |
