Jacoby Tarbox — Sight Flow Indicators
PFA/Teflon Lined Indicators
PTFE · PFA · ETFE · CTFE · Rubber Lined · Corrosive & High-Purity Service
Teflon®-Lined & Fluoropolymer-Lined Sight Flow Indicators
Metal body strength with full fluoropolymer or rubber lining for aggressive chemical service. All wetted surfaces — body, flapper, gaskets — lined or made from the selected material. Available in PTFE, PFA, PVDF, and rubber linings.
Lined sight flow indicators provide the structural strength of a metal body with the chemical resistance of a fluoropolymer or rubber lining. All wetted surfaces — body, flapper, and gaskets — are lined or made from the selected material, ensuring no metal contact with the process fluid. Available in a range of lining materials to match the specific chemical service.
Lining Materials
The most chemically resistant lining material available. PTFE is virtually inert to all chemicals except molten alkali metals and elemental fluorine. Excellent for concentrated acids, caustics, solvents, and oxidizing agents. Low coefficient of friction reduces fouling.
Similar chemical resistance to PTFE but with better high-temperature performance and improved resistance to stress cracking. PFA can be melt-processed, allowing thinner, more uniform linings. Preferred for applications above 400°F or where PTFE stress cracking is a concern.
Excellent chemical resistance with superior mechanical strength compared to PTFE and PFA. ETFE is more impact-resistant and abrasion-resistant, making it suitable for slurries and abrasive media. Good resistance to most acids, bases, and solvents.
Outstanding chemical resistance with very low permeability to gases and liquids. CTFE has excellent resistance to strong oxidizing acids and is particularly suited for liquid oxygen, liquid nitrogen, and cryogenic service. Also used for fuming nitric acid and other aggressive oxidizers.
Rubber-lined sight flow indicators provide excellent resistance to dilute acids, alkalis, and abrasive slurries at lower cost than fluoropolymer linings. Available in natural rubber, neoprene, EPDM, and other elastomers depending on the chemical service.
General Specifications
| Parameter | Value |
|---|---|
| Connection Types | NPT threaded or ANSI flanged (150# and 300#) |
| Size Range | 1/2" – 8" (size range varies by lining material) |
| Pressure Rating | Up to 150 PSI WOG (lining material dependent) |
| Temperature | Varies by lining: -400°F to +500°F (see lining table) |
| Body Materials | Carbon Steel or 316 SS (lining protects wetted surfaces) |
| Lining Materials | PTFE, PFA, ETFE, CTFE, Natural Rubber, Neoprene, EPDM |
| Viewing Glass | Borosilicate glass with PTFE or PFA gaskets |
| Indicator Types | Flapper (PTFE-coated), Rotary (PTFE-coated), Viewing only |
| Testing | All units hydrotested prior to shipment |
| Compliance | FDA-compliant materials available for food/pharma service |
Lined sight flow indicator sales & chemical compatibility
Contact us with your process fluid and conditions for lining material recommendations.
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