Abstract: The invention relates to a rotary gate valve arrangement with a gate valve housing, a rotatably mounted gate valve rotor arranged therein at right angles to the material flow direction and having a part-cylindrical sliding part which co-operates with a sealing arrangement containing a cassette-like rectangular sealing frame with a sealing element running around it, the sealing frame being received in the receiving channel formed in the housing in such a way that through flow of material is unimpeded and the sealing frame can be simply and quickly inserted and withdrawn without the removal of essential parts of the rotary gate valve.

Abstract: An improved process and apparatus for the spin-drawing of high-tenacity, technical-grade yarns is disclosed. The process and apparatus are particularly suitable for use with polyamide and polyester. High quality yarns having a low break elongation are obtained by maintaining the feed roll system at a constant temperature T.sub.E =(T.sub.G -20.degree. C.) to (T.sub.G +65.degree. C.), wherein T.sub.G is the temperature of the glass transition point. Filaments are passed over a roll system disposed between the feed roll system and the draw roll system and driven at a peripheral speed between that of the feed roll and draw roll systems. The filaments are passed over the roll system a maximum of three turns.