Mechanical · M-J73TP

Flow Switch Installation Detail

Materials

Steel Stainless Steel

Elements

Reinforcing

Connections

Welded Connection

About this detail

A McDonnell & Miller model FS4-3 flow switch with a brass body, single-pole double-throw switch, and reinforced paddle is installed on a vertical pipe conveying water upward. The flow switch mounts using a one-and-a-half-inch thread-o-let welded to pipes two and a half inches and larger, or a one-and-a-half-inch tee for pipes one-and-a-half and two inches, connected via a one-and-a-half by one-inch bushing. A stainless steel nut with a locking nylon insert secures to the vane screw. The proper vane length is selected to match the pipe size or trimmed for installation in pipes larger than three inches. The flow switch must maintain a minimum of five diameters of straight pipe upstream and the flow arrow on the switch must match the flow direction in the pipe.

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