Abstract: In a gas flow regulating valve, the needle (37) axially shifted by a rod (40) includes a recess (70) which is of variable depth and cooperates with an expanding sealing element (43). The valve is provided with a safety closure means comprising a valve member (33) which has a spring (35) and whose displacements are controlled by a free connection tube (30).

Abstract: The tubular rotary body of a ball slide consists of components which transverse to its longitudinal axis bear on one another and are detachably connected with one another. The rotary body is preferably split in two in its axis of rotation plane. Reinforcement ribs screwed together in the joining plane and pivot pin flanges connected positively and nonpositively with the rotary body components ensure the coordination of said components. Splitting the rotary body circumvents hauling difficulties, without weakening the load capacity of the rotary slide.