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Sight flow indicators provide a window into piping. The process flow stream can be monitored by observation through the glass window. Special mechanisms can be mounted in most sight flow indicator models to enhance visibility when observing a liquid.
The four basic components of slight flow indicators are:
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Body: provides in-line attachment capability and rigidity to the sight flow indicator.
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Glass: provides the viewing window to the process flow stream.
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Gasket: compresses to seal the gap tightly and prevent leaking between the glass, body, and cover.
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Cover: provides compression surface for the bolts to hold the gasket and glass tightly against the sight flow body.
*Product images are for reference only, please refer to general or approval drawings for accurate dimensions.*
There are four basic indicator types:
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Plain: A plain sight flow indicator can be used in a liquid application where there is a visual contrast between the liquid presence and its absence. Contrast in the forms of color, tint, hue, clarity or turbulence indicates variation in flow. Any orientation of flow can be observed.
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Flapper: A flapper sight flow indicator can be used in a liquid application where there is a great enough liquid mass impact to move the weight of the flapper. A hinged flapper indicated variation in flow by its position. Transparent or slightly opaque fluids can be monitored. Horizontal and vertically upward flow can be observed.
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Rotator: A rotator sight flow indicator can be used in a fluid application where there is great enough liquid mass impact to spin the PTFE rotator paddle wheels. A spinning motion indicates variation in flow, ideal for darker color solutions where color contrast is better, translucent liquids and clear solutions. Any orientation of flow can be observed.
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Drip tube: A drip tube sight flow indicator can be used in a fluid application where there is formation of liquid droplets. Condensation collecting on the tube indicates variation in flow. Distillation and similar processes with intermittent flow can be monitored. Horizontal and vertically downward flow can be observed.
