Sample-taking valve for removing liquid or flowable matter from vessel or pipeline - has displacement piston followed by blocking piston, forming intermediate space between pistons and causing delivery opening to close

摘要

An axially movable displacement piston (7) extends from the feed opening (4) to the delivery opening (5), followed by a closing piston (9). A reception chamber is formed between the two pistons by relative movement. The closing piston can be brought to a closing position by a follower unit (12) of the displacement piston. The piston (7) in the rest position, also closes the removal chamber and the delivery opening (5). The closing piston (9) is loosely penetrated by the piston rod (8) of the displacement piston (7), and the piston rod has a follower ring (12) for the closing piston. ADVANTAGE - Simple construction, easily cleaned and has complete sealing against surroundings in each valve setting. Takes samples under difficult conditions such as pressure, vacuum and high temp.