Material Properties And Design Advantages Of Ptfe-lined Flange Butterfly Valves

For biopharma lines handling aggressive acids and solvents, install a PTFE lined butterfly valve with flange connections (PN10, PN16, or 150LBS). The thick PTFE lining isolates fluid from the metal body, eliminating corrosion and metal ion leaching. Available in sizes DN40–DN600, temperature -29°C to +180°C (PTFE). Internal surfaces polished to Ra ≤ 0.8 µm meet FDA and USP Class VI standards.

The Corrosion Challenge

Strong acids, caustic solutions, and organic solvents degrade unprotected metal valves. Pitting, crevice corrosion, and stress cracking cause leaks, contamination, and downtime. The ptfe lined butterfly valve provides an inert barrier that resists chemical attack.

Corrosion risks eliminated by PTFE lining:

•  Pitting and crevice corrosion

•  Stress cracking from chemical exposure

•  Metal ion leaching into products

•  Product contamination from degraded seals

•  Equipment failure from wall thinning

PTFE Lining Material Properties

PTFE (polytetrafluoroethylene) resists acids, bases, and solvents from -29°C to +180°C. Compression‑molded or injection‑molded onto the body and disc, the lining creates a seamless, pore‑free barrier. This ptfe lined valve handles hydrochloric acid, sulfuric acid, and sodium hydroxide. The ptfe butterfly valve offers a non‑stick surface that prevents product adhesion and simplifies cleaning. For higher temperatures, PFA linings are available up to 200°C, and FEP linings up to 150°C.

Construction and Design Features

The ptfe lined butterfly valve consists of a metal body with a thick PTFE lining, a lined disc, and a PTFE‑encapsulated stem. The wafer or lugged body connects between flanges, with sizes DN40–DN600. Adjustable stem packing and self‑lubricating bearings ensure smooth operation. This lined butterfly valve provides bubble‑tight shut‑off and supports CIP/SIP. Gasket materials (PTFE, PFA, or FEP) match the lining and process requirements.

Key design features:

1. Thick PTFE lining (2‑3 mm) resists erosion and permeation

2. Lined disc and body ensure complete fluid isolation

3. PTFE‑encapsulated stem eliminates metal‑to‑fluid contact

4. Adjustable packing for leak‑tight sealing

5. Self‑lubricating bearings for low torque operation

Specifications and Selection Criteria

Applications and Selection Considerations

The lined butterfly valve is used in acid transfer lines, solvent systems, CIP supply headers, pharmaceutical transfer, and high‑purity water loops. The ptfe lined butterfly valve is specified for corrosive service where metal valves fail. These ptfe lined butterfly valves are available in multiple sizes and pressure ratings to match process requirements.

When selecting:

• Size — DN40–DN600 based on line diameter.

• Pressure — PN10, PN16, or 150LBS.

• Temperature — choose PTFE (180°C), PFA (200°C), or FEP (150°C).

• Gasket — PTFE, PFA, or FEP matched to media.

The ptfe lined valves are designed for long‑term corrosion resistance and product purity.

Installation and Maintenance

Install between flanges per ANSI or EN standards. Use gaskets matched to the process media (PTFE, PFA, or FEP). The valve supports in‑line inspection and cleaning. Replace seals and packing every 12‑18 months. The full‑bore design allows easy cleaning and pigging.

This valve design protects product purity and equipment integrity in biopharma facilities. The PTFE lined butterfly valve delivers reliable, leak‑tight performance across critical applications.

FVF PTFE Lined Flange Type Butterfly Valve

• FVF PTFE lined butterfly valve features a state-of-the-art design that provides excellent shutoff protection (bubble-tight shutoff) and high Cv values with exceptionally long service life. The resilient seated butterfly valve is available in a variety of materials including PTFE, PFA, Stainless Steel and special alloys to fit a wide range of customer requirements.
• FVF PTFE lined butterfly valves are available with Wafer style or Lug style 150# ANSI flange connections. They can be equipped with a manual lever or can be actuated with electric or pneumatic actuators. A full range of accessory items are available including limit switches, solenoid valves, positioners and manual override devices.
• FVF lined butterfly valves bi-directional flow is possible at maxmium operating pressure. Since the valve port corresponds to the piping diameter, a high flow capacity is guaranteed.It features ease of maintenance, repeatable on-off, long life durability.
• It is commonly used in the power generation, brewing, water and food industries and suitable for both gaseous and liquid service. Typically applied in chemical/petrochemical process, food and beverage, and pulp and paper etc.