Anchor guide tube in membrane valve - has ring groove or knurled area near fixture part which has venting channel

摘要

The membrane valve has an anchor guide tube and a fixture which can be screwed against a membrane in the valve body. The fixture part (14) is formed directly out of plastic on the anchor guide tube (16). The cover surface of the anchor guide tube (16) has a rough area in the vicinity of the fixture part (14) this area being formed as a ring groove. It can also be knurled (17). The fixture part (14) has a multi-sided section (18), and a venting channel (19, 19'). The outer mouth (21) of this channel (19) is arranged in a vertical outer surface of the fixture part (14e whilst its inner mouth (22) is adjacent the cover surface of the anchor guide tube (16).