Full PFA Lined Butterfly Valve – Lugged Type
Description
Technical Data Sheet
Product: Full PFA Lined Butterfly Valve – Lugged Type
Body: ASTM A395 Ductile Iron, Internally Fully Lined with PFA
Disc: CF8M (316 SS) Core, Fully Encapsulated in PFA
Type: Concentric Disc, Full Bore, Bubble-Tight Shutoff
1. General Description
This valve is a fully lined, concentric disc butterfly valve engineered for the most demanding chemical and high-purity services. Every wetted surface is completely isolated from the metal body and disc core by a thick, seamless PFA (Perfluoroalkoxy) liner and encapsulation. The PFA material offers superior chemical resistance, enhanced temperature capability, and exceptional non-stick, anti-permeation properties compared to PTFE. The interference fit between the PFA-lined disc and the PFA body liner provides a bi-directional, bubble-tight seal without requiring a separate seat ring. The lugged body design permits dead-end service and downstream pipe removal while the upstream side remains pressurized.
2. Design, Manufacturing & Inspection Standards
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Valve Design: API 609 Category A (Lug Type), MSS SP-67, EN 593
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Pressure Rating: ASME Class 150 / PN10 / PN16 (Standard: Class 150)
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Face-to-Face: API 609 Table 2 (Long Pattern) / ISO 5752 Series 20
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Flange Drilling: ASME B16.5 Class 150 / EN 1092-2 PN16
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Lug Drilling: Tapped lugs match flange bolt holes; suitable for dead-end at full rated pressure
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Testing & Inspection: API 598 (Zero Leakage Closure Test)
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Lining Integrity: Spark Test at 10–15 kV DC (no pinholes)
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Marking: MSS SP-25
3. Technical Parameters
| Parameter | Specification |
|---|---|
| Nominal Size | DN50 – DN600 (2″ – 24″) |
| Pressure Class | Class 150 (PN20) – other pressure classes on request |
| Body Material | ASTM A395 Ductile Iron (60-40-18), superior corrosion resistance |
| Body Lining | Virgin PFA, seamless one-piece moulded, minimum 3 mm thick |
| Disc Core Material | ASTM A351 CF8M (316 Stainless Steel) |
| Disc Encapsulation | Virgin PFA, fully moulded and permanently fused to disc core, ≈3–5 mm thick |
| Seat / Seal Principle | Full PFA liner interference fit – bubble-tight, bi-directional zero leakage |
| Shaft Material | SS316 (CF8M) or Hastelloy C-276 (on request) |
| Shaft Sealing | Self-adjusting PFA / PTFE chevron V-ring packing; externally adjustable gland |
| Upper / Lower Bearings | PFA / PTFE composite bushings, maintenance-free |
| Connection | Lugged – full lugged design, rated for dead-end service |
| Operation | Manual Lever (≤DN150) / Gearbox (≥DN200) / Bare shaft with ISO 5211 mounting pad |
| Media Temperature Range | -29°C to +180°C (-20°F to +356°F) continuous Max +200°C (+392°F) intermittent (see pressure derating) |
| Suitable Media | Strong mineral and organic acids (including hydrofluoric), alkalis, solvents, ultra-pure water, high-purity chemicals, chlorine, phosgene, and most aggressive chemical media. Verify PFA compatibility at temperature. |
| Leakage Rate | Rate A (Zero visible leakage) per API 598 / EN 12266-1 |
| Coating | Valve body external: Standard anti-corrosive epoxy paint (blue/black); PFA wetted surfaces unpainted |
4. Materials of Main Parts
| No. | Part Name | Material |
|---|---|---|
| 1 | Body | ASTM A395 Ductile Iron, fully lined with virgin PFA |
| 2 | Disc | CF8M (SS316) core, fully encapsulated in virgin PFA |
| 3 | Stem (Top / Bottom) | ASTM A276 316 Stainless Steel |
| 4 | Body Liner | Virgin PFA (one-piece, seamless moulded, white/translucent) |
| 5 | Disc PFA Encapsulation | Virgin PFA, isostatically moulded, securely bonded |
| 6 | Stem Sealing Packing | PFA / PTFE V-ring set |
| 7 | Gland Follower | SS316 or PTFE / PFA |
| 8 | Stem Bearings | PFA / carbon-graphite composite bushings |
| 9 | Thrust Washer | PTFE / 25% glass-filled PTFE |
| 10 | Lug Inserts (Threaded) | Carbon Steel, Zinc Plated (SS316 or PFA coated on request) |
| 11 | Lever / Gearbox Housing | Ductile Iron / Carbon Steel, weatherproof painted |
5. Main Dimensions and Weights (Class 150 Lugged, Long Pattern)
For gear-operated valves. Handwheel diameter not included in height. ISO 5211 top flange as noted.
| DN | Size (in) | Face-to-Face L (mm) | Flange OD D (mm) | H1 (Center to stem top) (mm) | H2 (Center to handwheel) (mm) | ISO Flange | Approx. Weight (kg) |
|---|---|---|---|---|---|---|---|
| 50 | 2 | 43 | 152 | 100 | 210 (lever) | F07 | 6 |
| 80 | 3 | 46 | 190 | 130 | 260 (lever) | F07 | 9 |
| 100 | 4 | 52 | 228 | 145 | 300 (lever/gear) | F07 | 12 |
| 150 | 6 | 56 | 280 | 190 | 350 (gear) | F10 | 21 |
| 200 | 8 | 60 | 343 | 230 | 420 (gear) | F10 | 36 |
| 250 | 10 | 68 | 406 | 275 | 480 (gear) | F12 | 56 |
| 300 | 12 | 78 | 483 | 325 | 550 (gear) | F12 | 88 |
| 400 | 16 | 102 | 600 | 420 | 680 (gear) | F14 | 160 |
| 500 | 20 | 127 | 715 | 510 | 820 (gear) | F16 | 270 |
| 600 | 24 | 154 | 840 | 600 | 950 (gear) | F16 | 410 |
Note: Dimensions and weights are typical for gearbox-operated valves. Lever-operated sizes up to DN150 have different heights. Final certified drawings will prevail. PN10/PN16 flanged dimensions available on request.
6. Pressure–Temperature Ratings
The maximum working pressure is determined by the lower of the A395 body rating and the PFA lining capability. Table based on Class 150 body and virgin PFA lining.
| Temperature (°C) | Max. Working Pressure (bar) |
|---|---|
| -29 to 50 | 19.6 |
| 100 | 16.5 |
| 120 | 14.5 |
| 150 | 12.0 |
| 180 | 10.0 |
| 200 (intermittent) | 8.0 (consult manufacturer) |
Test Pressures (Ambient Water)
Shell Test (1.5 × CWP): 29.4 bar
Seat Test (1.1 × CWP): 21.6 bar – Zero leakage
7. Installation and Maintenance Notes
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Orientation: Install with the stem horizontal or vertical. Do not install with the stem pointing downward.
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Dead-End Capability: The fully lugged body permits downstream pipe disassembly while the upstream line remains at full rated pressure. Tighten lug bolts per torque specifications.
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Flange Gaskets: No separate flange gaskets are required – the PFA liner face provides an integral sealing surface. However, thin PTFE envelope gaskets may be used if flange faces are damaged.
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PFA Sensitivity: PFA is softer than PTFE and can be damaged by sharp objects. Never use metal scrapers or wire brushes on the liner.
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Operation: Do not exceed the fully open/closed stop. Use a gearbox for sizes ≥DN200 or when frequent throttling is required (note: this is an on-off valve, not recommended for throttling).
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Maintenance: The stem packing is externally adjustable. If stem leakage persists after gland tightening, replace the V-ring set with the valve closed and the line depressurized. Bearings and seat are integral to the PFA liner and are not separately replaceable – the entire body liner must be replaced if damaged.
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Spark Test: A high-voltage spark test (10–15 kV) should be performed after installation or any maintenance to confirm lining integrity.
8. Ordering Information
Please provide the following details:
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Nominal size and pressure class (e.g., DN150 Class 150)
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Body: ASTM A395 with Full PFA lining
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Disc: CF8M core with Full PFA encapsulation
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Connection: Lugged (specify flange standard: ASME B16.5 or EN 1092-2)
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Operation: Lever, Gearbox, or bare stem with ISO mounting for actuator
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Media type, concentration, and operating temperature
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Special requirements: Hastelloy shaft, conductive/anti-static PFA, oxygen cleaning, ATEX environment, FDA-compliant PFA for food/pharma, dead-end service confirmation
If you require specific dimensions for PN10 or PN16, a chemical compatibility guide for PFA, or a version with pneumatic/electric actuation details, please let me know.
