Mechanical · M-9E2Y7

Flow Switch Installation Detail

Materials

Steel Stainless Steel

Elements

Reinforcing

Connections

Welded Connection

About this detail

A McDonnell & Miller model FS4-3 brass body SPDT flowswitch with a reinforced paddle is installed on a vertical pipe carrying water flow vertically upward. The flowswitch connects via a 1-1/2 inch by 1 inch bushing and a 1-1/2 inch thread-o-let for pipes 2-1/2 inches and larger, or a 1-1/2 inch tee for pipes 1-1/2 inches and 2 inches. A stainless steel nut with a locking nylon insert secures the vane screw, and the proper vane length is selected to match the pipe size or trimmed for installation in pipes larger than 3 inches. The flow arrow on the switch must match the flow direction in the pipe, requiring a minimum of five diameters of straight pipe.

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