Wafer-Type Butterfly Valve (Loose Liner Seat)
Description
Wafer-Type Butterfly Valve (Loose Liner Seat) – Technical Datasheet
Model: D71X-16C-LS
Type: Centerline Design, Wafer-Type
Seat Type: Removable Loose Liner Seat
I. Key Specifications
| Parameter | Value |
|---|---|
| Nominal Diameter | DN50 ~ DN600 |
| Pressure Rating | PN10/16 (Class 150) |
| Temperature Range | -30°C to +120°C (EPDM) -10°C to +150°C (FKM) |
| Connection | Wafer-Type (EN 1092-1 / ASME B16.5) |
| Actuation | Lever, Gear, Pneumatic (ISO 5211) |
II. Material & Construction
| Component | Material | Key Feature |
|---|---|---|
| Body | Ductile Iron (GGG50) / SS304/316 | Powder-Coated RAL 5010 |
| Disc | SS304/316 (Electropolished) | Flow-Optimized Profile |
| Stem | 17-4PH Stainless Steel (HRC≥35) | Double-Sealed Gland Design |
| Valve Seat | Loose Liner Assembly: | |
| – Seal Ring | Non-Bonded EPDM/FKM/PTFE | Free-Floating in SS304 Cage |
| – Retainer | Precision-Machined SS304 Groove | Quick-Lock Retention System |
| Sealing Mode | Dual-Compression (Axial + Radial) | Zero-Leakage (ANSI Class VI) |
III. Loose Liner Seat Advantages
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Ultra-Fast Replacement
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Seat ring removable without disassembling valve body (5-min maintenance).
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Pressure-Adaptive Sealing
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Medium pressure forces liner outward for self-energizing seal.
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Material Flexibility
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Interchangeable liners (EPDM for water, FKM for chemicals, PTFE for steam).
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Damage Resistance
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Liner floats independently – absorbs pipe strain/vibration.
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IV. Performance Data
| Test | Standard | Result |
|---|---|---|
| Seat Leakage | ISO 5208 A | < 0.1 ml/min (air test) |
| Cycles | MSS SP-68 | >80,000 (EPDM, PN16) |
| Extrusion Resistance | ASTM D1414 | 15 MPa burst pressure |
| Fugitive Emissions | ISO 15848-1 | Class BH (with live-loaded stem) |
V. Seat Installation System
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Step 1: Remove disc/stem assembly.
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Step 2: Extract old liner from body groove (no tools required).
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Step 3: Insert new liner – audible “click” confirms lock.
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Step 4: Reassemble disc (liner auto-centers during closure).
Note: No adhesive/vulcanization – full reversibility.
VI. Design Standards
| Category | Standard |
|---|---|
| Valve Design | ISO 10631 / API 609 |
| Face-to-Face | EN 558 Series 20 |
| Fire Safety | API 607 (Option) |
| Liner Materials | FDA 21 CFR 177 (EPDM/PTFE) |
VII. Options
| Feature | Specification |
|---|---|
| Liner Materials | EPDM (Standard), FKM, PTFE, UHMW-PE |
| Anti-Static | Spring-loaded disc-to-stem contact (ISO 5211) |
| Cryogenic Service | Extended stem (-196°C) + PTFE liner |
| High-Purity | Electropolished 316L body/liner (Ra≤0.8μm) |
VIII. Applications
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Chemical Industry: Frequent media changes (liner swap in <10 min).
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Power Generation: Cooling tower make-up water (EPDM liner).
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Mining: Slurry pipelines (replaceable UHMW-PE abrasion liner).
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Pharma: CIP systems (sanitary PTFE liner).
