Sight Flow Indicators

Flapper

Indicates flow by the position of a vane or flapper in the center of the viewing window. Recommended for transparent or slightly opaque solutions. Bi-directional, designed for horizontal and upward vertical flow. Frequently specified for gases as well as liquids.

Rotary

Indicates flow by the spinning of a rotor. Suitable for any flow direction and especially suited for dark solutions. Rotor motion is easily seen from great distances. Recommended for uses with transparent solutions or gases where flow rate detection is needed.

Drip

For vertical downward flow applications in distillation and similar systems involving extremely low or intermittent flow. Absolutely no obstruction to downward flow. Plain models without drip tubes operate effectively with flow in any direction.

Ball

For low-volume, vertical upward flow applications, particularly those involving slow-moving solutions. The ball is highly visible to indicate flow accurately at a glance.

Tube

For low-pressure vertical or horizontal flow requiring maximum visibility. Models vary in length up to 48 inches and tube diameters up to 13 inches. Should be used only in systems that do not place mechanical strains on the pipeline.

Cylindrical Sheathed-Tube

Provides the high visibility of regular tube models, along with sheathing to increase support and protection of the indicator, and takes some degree of mechanical strain.