PFA Fully Internal Lined Butterfly Valves

Description

3″ 150LB PFA Fully Internal Lined Butterfly Valve — Technical Data Sheet

1. General Description

This 3-inch, Class 150 butterfly valve features a body and disc fully encapsulated with PFA (Perfluoroalkoxy) lining. It is specifically designed for highly corrosive chemicals, high-purity media, and severe service conditions, ensuring absolute isolation of the metal components from the process fluid and achieving bi-directional zero leakage.

The valve adopts a concentric (resilient seated) design with a fully internal lined construction, available in wafer or lug connection configurations. All wetted surfaces are completely protected by the PFA lining, providing superior anti-corrosion performance and chemical inertness.

2. Technical Specifications

Parameter Specification
Nominal Size 3″ (DN80)
Pressure Class Class 150LB (PN10 / PN16)
Valve Type Concentric / Resilient Seated Butterfly Valve
Construction Fully Internal Lined
Connection Type Wafer or Lug
Design Standard API 609, MSS SP-67, ISO 5752
Face-to-Face API 609 Table 2 / ISO 5752 Series 20
Flange Standard ASME B16.5 Class 150
Testing Standard API 598 / ISO 5208 Rate A
Operation Lever / Gearbox / Pneumatic / Electric
Top Flange Mounting ISO 5211
Lining Thickness ≥ 3 mm (per ASTM F1545)
*Note: Design and manufacturing standards include ASME B16.34, API 609, MSS SP-67, and ISO 5752. Face-to-face dimensions comply with API 609 Table 2 / ISO 5752 Series 20. Flange drilling per ASME B16.5 Class 150. Inspection and testing per API 598 and ISO 5208.*

3. Materials of Construction

Component Material
Body Ductile Iron (DI, GGG40.3/GGG50) / Carbon Steel (WCB) / Stainless Steel (CF8/CF8M)
Body Lining PFA (Molded, 3 mm min. thickness)
Disc Stainless Steel (SS304/SS316, CF8/CF8M) + PFA Encapsulated
Stem Stainless Steel (SS304/SS316/17-4PH), Blow-out Proof Design
Seat Integrated PFA Lining (Molded together with body lining)
Bearing / Bushing PTFE Composite (Self-lubricating)
Sealing Elements FPM (Viton®) / EPDM / PTFE Encapsulated
O-Rings FKM / PTFE
The body lining is formed using high-pressure melt molding technology with a minimum nominal thickness of 3 mm, compliant with ASTM F1545. The disc is spherically machined and fully encapsulated in PFA, ensuring smooth operation and excellent sealing performance. The stem features an integral safety step design (blow-out proof), preventing ejection under high pressure or differential pressure.

4. Performance Data

4.1 Operating Conditions

Parameter Value
Operating Temperature -29 °C to +180 °C (-20 °F to +356 °F)
Leakage Class Bi-directional Zero Leakage (ISO 5208 Rate A / ANSI FCI 70-2 Class VI)
Vacuum Service Applicable, full vacuum rated within -10 °C to +160 °C (+14 °F to +320 °F)
4.2 Suitable Media

Strong acids (Sulfuric, Hydrochloric, Hydrofluoric), strong alkalis, organic solvents, high-purity water, wet chlorine gas, and other highly corrosive or high-purity process fluids.

4.3 Pressure-Temperature Ratings

Based on Class 150LB and PFA mechanical properties (typical values):

Working Temperature Maximum Allowable Working Pressure
-29 °C ~ +50 °C (-20 °F ~ +122 °F) 16.0 bar (232 psi)
+100 °C (212 °F) 14.0 bar (203 psi)
+150 °C (302 °F) 11.0 bar (159 psi)
+180 °C (356 °F) 8.5 bar (123 psi)
Note: Final pressure-temperature ratings must comply with ASME B16.34 and the lining manufacturer‘s specific data.
5. Key Dimensions — 3″ (DN80), Class 150

Dimension Wafer Type Lug Type
Face-to-Face (L) 46 mm (1.81 in) 46 mm (1.81 in)
Overall Height (H) Approx. 280 mm (11.0 in) Approx. 280 mm (11.0 in)
Top Height (H1) 181 mm (7.13 in) 181 mm (7.13 in)
Bottom Height (H2) 95 mm (3.74 in) 95 mm (3.74 in)
Flange Drilling ASME B16.5 Class 150, 4 holes, Ø 19 mm on Ø 152.4 mm PCD Same
Approx. Weight 8–12 kg (18–26 lbs) 10–14 kg (22–31 lbs)
Note: Exact dimensions and weights may vary by manufacturer. Final values shall be subject to the vendor-certified drawing.

6. Lining Integrity & Quality Testing

Test Item Standard / Specification
Lining Integrity Test 100% High Voltage Spark Test (15 kV or 10 kV DC) on every valve to ensure zero pinhole defects
Shell / Hydrostatic Test API 598 / ISO 5208 — Shell test at 1.5× rated pressure
Seat Leakage Test API 598 / ISO 5208 Rate A (Zero Leakage)
Design Qualification API 609, MSS SP-67, ISO 5752
Flange Compatibility ASME B16.5 Class 150 (also adaptable to EN 1092 PN10/PN16, JIS 10K)
All valves undergo 100% spark testing to verify lining integrity prior to shipment.

7. Actuator Mounting & Operation

7.1 Top Flange Mounting

The top flange conforms to ISO 5211, enabling direct mounting of quarter-turn actuators, gearboxes, and manual levers.

For 3″ (DN80) valves, the typical ISO 5211 mounting flange is F05 or F07 (to be confirmed per manufacturer).

7.2 Operation Modes

Mode Description
Manual Lever Suitable for infrequent operation
Gearbox For higher torque or frequent operation; self-locking
Pneumatic Actuator Double-acting or spring-return; requires 4–7 bar instrument air
Electric Actuator On-off or modulating duty; 110/220 VAC or 24 VDC supply
8. Key Features

Full Isolation — The body and disc are completely encapsulated with PFA, eliminating any contact between the metal and the media. Superior anti-corrosion performance.
Low Torque Operation — The extremely low friction coefficient of the PFA surface, combined with self-lubricating PTFE composite bearings, results in low operating torque and prevents sticking.
Bi-directional Sealing — The spherically machined disc matched with the integrated PFA seat ensures bubble-tight sealing in both flow directions.
Blow-out Proof Stem — Features an integral safety step design, preventing the stem from being ejected under high pressure or differential pressure.
Standardized Mounting — The top flange adheres to ISO 5211 for universal actuator compatibility.
Thick Lining — High-pressure melt-molded PFA lining with a minimum thickness of 3 mm provides reliable anti-permeation protection and enhanced durability under vacuum conditions.
Self-Sealing Stem Packing — Gland mechanism with self-sealing properties and wedge effect ensures high stem sealing performance, resisting thermal cycling and frequent operation.
9. Applicable Standards Summary

Category Standard
Design & Manufacture ASME B16.34, API 609, MSS SP-67, ISO 5752
Face-to-Face Dimensions API 609 Table 2, ISO 5752 Series 20, ASME B16.10
Flange Dimensions ASME B16.5 Class 150
Inspection & Testing API 598, ISO 5208, EN 12266
Actuator Mounting ISO 5211
Lining Thickness ASTM F1545 (≥ 3 mm)
Lining Integrity 100% High Voltage Spark Test (10 kV / 15 kV DC)
10. Typical Applications

PFA fully internal lined butterfly valves are widely used in the following industries and applications:

Chemical Processing — Handling strong acids, alkalis, solvents, and aggressive chemical intermediates
Petrochemical & Refining — Corrosive hydrocarbon streams, acid gas services
Pharmaceutical — High-purity and sterile process media
Water Treatment — Chemical dosing lines, demineralized water, high-purity water systems
Pulp & Paper — Bleaching chemicals, chlorine dioxide service
Mining & Metallurgy — Acid leach solutions, chemical extraction processes
Food & Beverage — CIP (Clean-in-Place) chemicals, food-grade acid/alkali handling
Steel Industry — Pickling lines, acid recovery systems
11. Ordering Information

When ordering, please specify the following:

Item Description / Options
Nominal Size 3″ (DN80)
Pressure Class Class 150LB
Body Material Ductile Iron / WCB Carbon Steel / CF8 / CF8M Stainless Steel
Connection Type Wafer or Lug
Operation Lever / Gearbox / Pneumatic Actuator / Electric Actuator
Lining Material PFA (standard); PTFE available upon request
Sealing Material FPM (Viton®) / EPDM / PTFE Encapsulated
Media & Temperature Specify process fluid, operating temperature, and pressure
Special Requirements Vacuum service, special cleaning (e.g., ultra-pure water rinse), NACE compliance, etc.
*Example specification line: 3″ (DN80) Class 150LB PFA Fully Internal Lined Butterfly Valve, Wafer Type, Ductile Iron Body, SS316+PFA Disc, FPM Seals, Gear Operated, ISO 5211 Mounting.*

12. Important Notes

This technical data sheet is based on general industry standards and typical product specifications. Exact dimensions and confirmed performance parameters shall be subject to the final vendor-certified drawing.
The pressure-temperature ratings provided are typical values based on PFA lining mechanical properties. The final pressure-temperature envelope must comply with ASME B16.34 and the specific lining manufacturer‘s validated data.
For vacuum service applications, full vacuum rating is applicable within -10 °C to +160 °C. Performance outside this range must be verified with the manufacturer.
All valves are 100% spark-tested for lining integrity. Hydrostatic shell and seat leakage tests are performed in accordance with API 598 / ISO 5208 prior to shipment.
For applications involving permeating media (e.g., wet chlorine, bromine), consult the manufacturer for material compatibility and anticipated service life.