Flow Indicators
OPW Engineered Systems has been manufacturing sight flow indicators for more than 60 years. Our experience has led to many innovations in design and manufacturing, making VISI-FLO® the most thoroughly engineered sight flow indicator on the market. VISI-FLOs are available in three series: the standard 1400 Series, 1500 High-Pressure / High-Temperature Series and the 1600 OEM Series.
Standard Features
- Exclusive 3-Year "No-Leak" Guarantee – VISI-FLO's innovative radial seal creates a constant and uninterrupted sealing force between the body and outside diameter of the glass lens. This sealing method provides a longer-lasting and better seal than conventional flat seals.
- Maintenance-Free Design – VISI-FLO's unique bolt-on-body design requires no special maintenance or torquing sequence to prevent leaks. This results in a safer, more reliable sight flow indicator than those units using tie rods to fasten lens and seal to body.
- Dimensionally Interchangeable – "FJP" Flanged VISI-FLOs feature end-to-end dimensions that match Jacoby-Tarbox and Penberthy and other manufacturers' units. "FJP" units are available in 3/4", 2", 3" and 4".
- Shipment Within 48-Hours on Most Items
- Rated for Full-Vacuum Service
Four Indicator Styles
- Propeller – The best way to show flow of opaque liquids. Ideal for observation at a distance. Not recommended for flow rates more than 100 GPM.
- Bi-Directional Flapper – This indicator points in either direction to show you at a glance which way the liquid is flowing.
- Bi-Directional Plain – When the color and clarity of your liquid are of prime importance.
- Drip Tube – Ideal for gravity, extremely low or intermittent flow. Keeps product from dripping on the glass.
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