PTFE Lined Sight Flow Indicator
PTFE Lined Sight Flow Indicator Manufacturer
Mayur (Valves) System Private Limited, an ISO 9001:2015-certified company, has been a trusted PTFE Lined Sight Flow Indicator manufacturer and exporter since 1978. We specialize in supplying durable flow monitoring solutions for demanding industrial applications. Our PTFE Lined Sight Flow Indicators allow operators to visually monitor fluid movement while providing excellent resistance to corrosive and aggressive media. We export to 40+ countries worldwide, ensuring consistent quality, timely delivery, and a smooth customer experience. Our products serve clients across Europe, North America, the Middle East, Southeast Asia, Russia, and other international markets.
MVS Valves PTFE Lined Sight Flow Indicator is a robust and reliable solution designed for visually monitoring the flow of aggressive and ultra-pure fluids. Built with a fully PTFE/PFA-lined body and durable borosilicate glass viewing windows, this sight flow indicator offers excellent corrosion resistance and high performance under challenging operating conditions. Whether it’s for chemical processing, pharmaceuticals, or ultra-clean fluid applications, this product ensures clear, uninterrupted visibility of media flow.
Engineered to meet the rigorous standards of API 598, ASME B16.34, and EN norms, this indicator guarantees quality, safety, and precision. It is available in a double-window type design, with sizes ranging from ½″ to 6″ (DN 15 to DN150) and flanged end connections conforming to ANSI 150 and PN10–16 pressure ratings. The construction materials include Cast Ductile Iron, Cast Steel, and Stainless Steel, all internally lined with PTFE, PFA, or PVDF to handle a wide range of corrosive media.
It can be installed in any pipeline direction, making it a versatile choice for various industrial applications. The industrial PTFE lined sight flow glass is ideal for continuous flow monitoring in systems where product integrity and chemical resistance are essential. From PFA PTFE Lined Sight Flow Indicators to PVDF PTFE Lined Sight Flow Indicators, MVS offers comprehensive variants tailored to specific operational needs. With advanced design and tested durability, our PTFE Lined Sight Flow Indicator stands out as a dependable component for fluid control systems demanding safety, visibility, and long-lasting performance.
Specification
| Specification | Details |
|---|---|
| Flange | As per ANSI B16.5 / B16.42 |
| Valve Size | ½″ - 6″ (DN 15 - DN150) |
| Lining Thickness | 3 to 5 mm |
| Test & Inspection - Hydraulic | Body (Shell) – 15 Kg/Cm² |
| Test & Inspection - Spark | 15 KVDC |
| Features | Inert to a wide range of corrosive chemicals Eliminates need of using expensive, exotic alloys |
| Optional Components | FULL VIEW (GLASS TUBE) DESIGN |
Material of Construction
| Body With Lining | Ductile Iron GGG40.3 / ASTM A216 Gr. WCB (FEP Lined) |
| Cover Plate | Ductile Iron GGG40.3 / ASTM A216 Gr. WCB |
| Glass | Toughened Glass |
| Cushion | PTFE |
| Bolts | M.S. (Zinc Plated) |
| Nuts | M.S. (Zinc Plated) |
| Body Material Options | Ductile Iron GGG40.3 / ASTM A395 Cast Steel ASTM A216 Gr. WCB ASTM A351 Gr. CF8 / AISI S.S. 304 ASTM A351 Gr. CF8M / AISI S.S. 316 |
| Lining Material Options | PFA – ASTM D 3307 FEP – ASTM D 2116 PVDF – ASTM D 3222 POLYPROPYLENE – ASTM D 4101 |
Application Industries
Crude Oil & Natural Gas Industry
Chemical & Petrochemical Industry
Water & Wastewater Treatment
Nuclear & Thermal Power Generation
Food & Beverage Industry
Pharmaceutical & Biotechnology
Pulp & Paper Industry
Mining & Mineral Processing
Marine & Shipbuilding
HVAC & Building Services
Automotive & Paint Chemical Manufacturing
Environmental & Bio Gas Renewable Energy
Steel & Metal Processing
Fertilizer Plants, Polymer Production
Cosmetics & Personal Care
Cement & Construction
Chlor-Alkali Industry
Mineral Acids Industry
Related Valves
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PTFE Lined Sight Flow Indicator
Frequently Asked Questions
Can’t find your duty condition here? Send us the media, size, pressure and temperature and we will specify the valve. Contact us
What is a PTFE lined sight flow indicator and how does it work?
A short lined spool with a toughened glass window, cushioned against the body by PTFE rather than bolted against bare metal. It lets you see the fluid inside a corrosive line — whether it is flowing, running full, or has changed colour or picked up solids. Because the body is lined and the glass sits on a PTFE cushion, it survives acids and solvents that would attack an ordinary metal sight glass.
Which body, lining and window materials are available?
Lined body in Ductile Iron GGG40.3 or ASTM A216 Gr. WCB (FEP lined), with options in ASTM A395, Cast Steel WCB and ASTM A351 Gr. CF8/CF8M. Cover plate in ductile iron or WCB. Window in toughened glass with a PTFE cushion. Lining in PFA (ASTM D3307), FEP (ASTM D2116), PVDF (ASTM D3222) or Polypropylene (ASTM D4101), at 3–5 mm. Bolts and nuts in zinc-plated mild steel.
What size and test pressures apply?
½″ to 6″ (DN 15 – DN 150), with flanges per ANSI B16.5 / B16.42. Hydraulic shell test 15 kg/cm², plus a 15 KVDC spark test. A full view glass tube design is available as an optional variant where you need to see the whole bore rather than through a window.
Why use a lined sight glass rather than a high alloy one?
Because it does the same job for a fraction of the cost. A lined body in ductile iron or WCB is inert to the same wide range of corrosive chemicals as an exotic alloy spool, and eliminates the need for expensive alloy construction in what is only an observation point. For thermoplastic lines the alternative is a PVDF sight glass; for non-corrosive service, a double window sight glass.
Are you a manufacturer, and what are your minimum order quantity and customization options?
MVS manufactures at its own works — since 1978, ISO 9001:2015 certified — and exports across several continents. The minimum order quantity is 20 pieces. Full view glass tube design, stainless bodies, PFA, PVDF and PP linings and non-standard flange drilling are built to order.