BACKFLOW PREVENTER WITH DISCHARGE VALVE AND DOWNSTREAM CHECK VALVE

摘要

The valve has an input reflux preventer for interrupting a connection for a liquid between a form zone (2) and a central zone (14) and an output reflux preventer (13) for interrupting a connection for a liquid between the central zone and an after zone (3). The input reflux preventer, the output lateral reflux preventer and a drain valve have a check element (7, 8) and a valve seat which are movable against each other for manufacturing and interrupting the connections. The check element of the drain valve and the check element of the input reflux preventer are firmly connected.