Mechanical · M-D2MJ9

Flow Switch Installation Detail

Materials

Steel Stainless Steel

Elements

Reinforcing

Connections

Welded Connection

About this detail

A McDonnell & Miller Model FS4-3 brass body flowswitch with a single pole double throw switch and reinforced paddle mounts to a vertical water pipe with upward flow. The connection utilizes a 1-1/2 inch thread-o-let welded to pipes 2-1/2 inches and larger, or a 1-1/2 inch tee for pipes 1-1/2 inches and 2 inches, coupled with a 1-1/2 inch by 1 inch bushing. A stainless steel nut with a locking nylon insert secures the vane screw, and the proper vane length is selected or trimmed to match the pipe size. The flow switch must be installed in a vertical pipe with water flowing vertically upward, maintaining a minimum of five diameters of straight pipe, and the flow arrow on the switch must match the flow direction in the pipe.

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