Abstract: A quick-acting valve 1 having metering relief is used in particular for oxygen lances, wherein the actual sealing body 10 inside the valve tube 2 has a two-part design and accommodates the valve spring 8 with the housing parts 16 and 17 of the spring. The gas is conducted around the sealing body 10, so that the gas pressure cannot have an effect on the actuation by way of the hand lever 3. The rear housing part 17, which is located behind the front housing part 16 can be displaced inside the front housing part 16, and has a flow-promoting design, being displaced against the force of the valve spring 8, and specifically with the help of the hand lever 3, so that it now can be actuated independently of the gas pressure with precise metering control.

Abstract: The use of oxygen lance tubes 12 for refining in connection with steel production is simplified and configured more safely in that the sealing casing 14 is allocated a slidable pressure piston 15 in which pressure media act on the pressure casing 14 to a limited extent, thus improving the mounting of the lance tube 12; the latter is fixed from the other side over the pressure casing 4 pushed on to the collet 3. Upon activation of the adjusting facility 11, regardless of whether it is a pneumatic or manually operated adjusting facility 11, the pressure casing 4 slides down from the collet 3 and the interior space 16 is simultaneously connected with the atmosphere through a bypass 17 with a shut-off valve 18. Any excessive oxygen pressure possibly developing here, for example as a consequence of a lance tube 12 blocked by slag, may be rapidly reduced without endangering the operating crew.