This construction is ideal for violent flows and/or heavy paddles. We utilize a pivot at the base of the flow switch, with the stem and paddle hanging on this pivot. Above the pivot, the stem ends in a socket which operates a ball attached to the upper arm.
This construction can be used for flow and reverse flow applications. For over 24″ stem extension, this design is mandatory. It cannot be used in small tees. The paddle can be a solid or hollow cylinder, perforated, bar paddle, or other special design.