Lined Diaphragm Valves
Our PFA lined Diaphragm valves are designed for handling aggressive corrosive conditions, ensuring long-term durability under the harshest conditions. With exceptional corrosion resistance, these valves are used in industries like chemical processing, chlor-alkali, mining, petrochemicals, pulp and paper, steel, pharmaceuticals, and wastewater treatment. We also offer diaphragm valves with FEP/PVDF/ETFE/ECTFE and PPH liners.
Our diaphragm valves can operate in a wide temperature range (- 40 °C to 230 °C) and can withstand pressures up to 10 bar . Certified for CLASS VI – Tight Shutoff as per API 598, these valves have zero leakage ensuring safe and reliable operations.
Our diaphragm valves come with versatile operational options—choose from Rising Stem/Spindle or Rising Hand wheel design, electric, or pneumatic actuator for effortless control. We can offer regular double layer (TFM + EPDM) as well triple layer (PTFE+PVDF+EPDM) Diaphragms to minimize diffusion or permeation especially for chlorine applications. For easy maintenance, the diaphragm can be replaced without having to dismount the valve from the pipeline. The precise geometry and injection molded diaphragm ensures leak tight sealing and high endurance. Available in sizes from DN15 – DN 250 ( 1/2” to 10”), straight type or weir type, our valves are ready to meet the demands of your project.
With decades of industry expertise, our team is dedicated to delivering high-quality, cost-effective solutions tailored to your needs.
Technical Specifications
- Size Range: DN15-DN250 (1/2"-10")
- Design: BS EN 13397 / ANSI B16.34
- Face to Face: EN 558-1 Series 7
- Rating: ANSI B 16.5, #150 / DIN PN 10 / JIS
- Diaphragm : TFM+EPDM / TFM+PVDF+EPDM / TFM+HYPALON / TFM+NEOPRENE / TFM+VITON
- Lining : PFA / FEP / PVDF / ETFE / ECTFE / PPH / Antistatic PFA
- Sealing : CLASS VI, Tight SHUT OFF as per API 598
- Temperature: - 40 °C to 230 °C
- Max Pressure: 10 Bar
- Test standards: BS EN 12266-1-2003 (Hydro test, Pneumatic test, Spark test)
- Body Materials: ASTM A 216 GR. WCB / ASTM A 351 GR. CF 8 or 8M (SS316) / SS304 / ASTM A 890 GR. 4A (CD3MN) / Super Duplex / Alloy 20 / Hastelloy C
Product Features
Highly Corrosion-resistance PFA lining
Made from 100% virgin high purity Grade A PFA, with optional antistatic PFA for enhanced safety.
Investment
casted body
Made with investment castings, the metal housing ensures an intact and uniform lining.
3 Layer
Diaphragm
Three layer diaphragm (PTFE + PVDF + Rubber/EPDM) for extra protection against corrosion in critical applications.
Easy
Maintenance
No frictional parts and diaphragm can be replaced without dismounting the valve.
Class VI Tight
shut off
Designed to API 598 standards for Class VI tight shutoff, ensuring zero leakage in all operating conditions.
Enhanced Process
compatibility
Available in both weir and straight types, with multiple liner options including PFA, FEP, PVDF, ETFE, ECTFE, and PPH to suit various applications.
Certified
Quality
Available with CE / PED certification and Hydro test, Pneumatic test, Spark test, Helium test according to API 598 / BS EN 12266-1
ISO mounting
pad
Direct mount actuation pad provided for quick and easy automation.
Documents
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GreyTec -Lined Diaphragm Valves – Brochure.pdf |
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Case Stories
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Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an when an unknown printer took a galley of type and scrambled it to make a type specimen book.
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FAQ's
Ans. A PFA-lined diaphragm valve features a body lined with PFA (Perfluoroalkoxy alkanes) and a diaphragm made from PTFE, providing excellent corrosion resistance and low permeability. This makes it ideal for handling aggressive chemicals, where standard valves may not be suitable.
Ans. PFA lining offers high chemical resistance, a smooth surface that minimizes friction and fouling. The PFA lining acts as a barrier between the flowing medium and the valve's internal components, effectively shielding them from corrosive substances.
Yes, these valves generally require minimal maintenance. Since there are no frictional moving parts in this type of the valve, the valve body and inner lining remains intact for a long time. Regular inspection for wear and tear, along with routine cleaning, can help ensure their longevity. Another advantage is that the diaphragm can be replaced inline without dismounting the valve.
A key advantage of a diaphragm valve over a ball valve is that it uses a flexible diaphragm (membrane) to regulate liquid flow by moving up and down, making it well-suited for handling slurry liquids or those containing abrasive particles. In contrast, a ball valve relies on turning of a ball, and abrasive particles can get trapped between the ball and seat, and scratch the lining surface, eventually leading to its failure. Additionally, the diaphragm in this type of valve is replaceable for maintenance, reducing the need to replace the entire valve body. However, a drawback of diaphragm valves is that they typically have a higher pressure drop compared to similarly sized ball valves.
Yes, diaphragm valves are very well suited for abrasive or slurry applications. Because of their open design, particles do not get blocked and this prevents choking.
Yes, these valves find extensive application in Chlor-Alkali industries handling aggressive chemicals like hydrochloric acid and caustic soda.
Certainly! We offer Antistatic PFA lined Valves in Dupont's grade C 980 or 3M Dyneon's 8502 ESDZ. Choosing the correct material is crucial, as a grounding spring alone cannot dissipate static charge in a standard PFA grade, which is non-conductive.
We keep many valves in stock in our warehouse in Netherlands, India and USA and can ship them within a week.
Our diaphragm valves are available in numerous sizes DN15-DN250 (1/2"-10") providing a range of options to meet diverse industrial needs.