AILAN Tech

Full PTFE Lined Butterfly Valve

Engineered for superior corrosion resistance and reliable shut-off in the most aggressive chemical environments. Features a full PTFE lining to protect the valve body and ensure bubble-tight sealing against acids, bases, and other hazardous media.

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DIN Resilient Seated NRS Gate Valve

Product Overview

The Full PTFE Lined Butterfly Valve is specifically designed to handle highly corrosive and aggressive media in chemical processing, pharmaceutical, and wastewater treatment applications. Its unique construction features a seamless PTFE liner that encapsulates the entire wetted surface, providing exceptional chemical resistance and ensuring zero metal-to-media contact.

Unlike standard butterfly valves, the full PTFE lining protects the valve body from corrosion, extends service life, and maintains superior sealing performance even with the most challenging fluids. The valve's design ensures bi-directional flow capability and bubble-tight shut-off, making it ideal for critical isolation and control applications.

Our Full PTFE Lined Butterfly Valve is available in wafer, lug, and flanged end connections, with manual, pneumatic, or electric actuation options to meet your specific application requirements.

Key Features & Benefits

Full PTFE Lining

Seamless PTFE liner covers all wetted surfaces, providing exceptional chemical resistance and preventing corrosion.

Bubble-Tight Sealing

PTFE seat ensures Class VI shut-off, preventing leakage even with the most aggressive media.

Bi-Directional Flow

Symmetrical design allows for equal performance in both flow directions, eliminating flow direction restrictions.

Low Torque Operation

PTFE lining reduces friction, requiring less actuation force and extending actuator life.

Multiple End Connections

Available in wafer, lug, and flanged end connections to suit various pipeline configurations.

Flow Control Capability

Suitable for both on/off and throttling applications, providing precise flow control in corrosive environments.

Technical Specifications

Basic Parameters

Parameter Specification Range
Nominal Diameter (NPS) 2" ~ 48"
Common Sizes: 4", 6", 8", 10", 12", 16", 20", 24"
Class Rating Class 150, Class 300
Operating Temperature -40°F ~ 450°F (-40°C ~ 232°C)
Applicable Media Acids (HCl, H2SO4, HNO3), Bases (NaOH, KOH), Solvents, Chemicals, Wastewater, Corrosive Fluids
Sealing Class API 598 Class VI

Material Specifications

Component Material Options Standards/Features
Valve Body Carbon Steel, Stainless Steel ASTM A216 WCB, ASTM A351 CF8/CF8M, Full PTFE Lining
Disc Stainless Steel AISI 304/316, Fully Lined with PTFE
Seat PTFE Virgin PTFE, FDA-Compliant Options Available
Stem Stainless Steel AISI 416/420, PTFE Coated for Corrosion Resistance
Actuator Manual, Pneumatic, Electric Handwheel, Scotch Yoke Pneumatic Actuator, Electric Motor Actuator

Standards & Compliance

  • Design Standards: API 609, ISO 10631
  • Flange Standards: ANSI B16.5 Class 150/300
  • Testing Standards: API 598, Hydrostatic and Leakage Testing
  • Certifications: CE, FDA, API 609, ISO 9001

Working Principle

The Full PTFE Lined Butterfly Valve controls fluid flow using a simple yet effective mechanism:

  1. PTFE Lined Construction: The valve body, disc, and all wetted surfaces are fully lined with PTFE, creating a barrier between the metal components and the process media. This prevents corrosion and ensures compatibility with aggressive fluids.
  2. Opening Process: Rotating the handwheel or actuator turns the PTFE-lined disc away from the PTFE seat, allowing media to flow through the valve. The smooth PTFE surfaces reduce friction, resulting in low torque operation.
  3. Closing Process: Reverse rotation brings the PTFE-lined disc into contact with the PTFE seat, creating a bubble-tight seal. The uniform pressure distribution across the seat ensures reliable shut-off even with corrosive media.

Application Areas

Chemical Processing

Acid handling, chemical manufacturing, and specialty chemical processing.

Pharmaceutical

Active pharmaceutical ingredient (API) production and drug manufacturing.

Wastewater Treatment

Chemical dosing, effluent treatment, and sludge handling.

Pulp & Paper

Bleaching chemicals, black liquor, and process water handling.

Installation & Maintenance

Installation Guidelines

  • Inspect valve for damage and confirm closed position before installation; ensure PTFE lining is intact and free from cuts or tears.
  • Install between flanges using appropriate gaskets; avoid over-tightening flange bolts to prevent damage to the PTFE lining.
  • Ensure valve is centered and bolt holes align with flange holes; use a torque wrench to tighten bolts evenly in a crisscross pattern.
  • Mount actuator according to manufacturer's instructions; ensure actuator rotation direction matches valve operation (clockwise to close, counterclockwise to open).
  • Conduct hydrostatic testing (1.5×Class Rating) and leakage testing after installation before commissioning; use compatible test media to avoid damaging the PTFE lining.

Maintenance Recommendations

  • Regularly inspect stem packing for leaks; adjust or replace packing as needed to maintain stem seal integrity.
  • Check PTFE lining for signs of wear, cuts, or degradation; replace valve if lining is damaged to prevent media contact with metal components.
  • Lubricate stem threads and actuator components periodically with PTFE-compatible lubricant to ensure smooth operation.
  • For long-term shutdown, flush valve with clean water or compatible solvent to remove any residual media and prevent hardening or degradation of the PTFE lining.
  • Use only manufacturer-recommended replacement parts to maintain performance and compliance with standards; avoid using abrasive tools or chemicals that could damage the PTFE lining.

Frequently Asked Questions (FAQ)

Q: What is the maximum temperature rating for a Full PTFE Lined Butterfly Valve?

A: The maximum temperature rating for a Full PTFE Lined Butterfly Valve is typically 450°F (232°C). For higher temperature applications, consider a metal-seated butterfly valve or alternative valve type.

Q: Can Full PTFE Lined Butterfly Valves be used with abrasive media?

A: While PTFE provides excellent chemical resistance, it is not recommended for highly abrasive media as it can cause premature wear of the lining. For abrasive applications, consider a valve with a harder lining material or metal seat.

Q: Are Full PTFE Lined Butterfly Valves suitable for food and beverage applications?

A: Yes, Full PTFE Lined Butterfly Valves are suitable for food and beverage applications when constructed with FDA-compliant PTFE lining and materials. They are commonly used in applications such as dairy processing, beverage production, and food manufacturing.

Q: What is the difference between a Full PTFE Lined Butterfly Valve and a Rubber Lined Butterfly Valve?

A: A Full PTFE Lined Butterfly Valve provides superior chemical resistance compared to rubber lined valves, making it suitable for highly corrosive media. Rubber lined valves are typically used for less aggressive media and offer better abrasion resistance. PTFE lined valves also provide higher temperature resistance and bubble-tight sealing performance.

Need Custom Solutions?

Our engineering team can customize Full PTFE Lined Butterfly Valves to meet your specific pressure, temperature, and media requirements. Contact us today for a personalized quote.

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