Concentric Butterfly Valve -- Wafer / Lug SS316 EPDM
Technical Datasheet -- Concentric Rubber-Lined Butterfly Valves for General Industrial and Water Service
Document No.SV-DATA-CBV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Concentric (rubber-lined) butterfly valves for general industrial, water, HVAC, and chemical service. Shaft passes through the centre of the disc with no eccentric offset. Rubber-lined body and disc edge provide API 598 Class A bubble-tight shutoff at low cost. Wafer or lug type. EPDM, NBR, Viton, or PTFE liner options. Simple robust design with low operating torque and long service life. API 609 Category A / MSS SP-67 / ASME B16.34 compliant. Lever, gear, or actuator operated.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Concentric Butterfly Valves |
| Category | Butterfly Valves |
| Size Range | 2" to 48" (DN50 to DN1200) |
| Pressure Class | Class 150 / PN10 / PN16 per ASME B16.5 / EN 1092-1 |
| End Connections | Wafer type (fits between flanges) or Lug type (through-bolted) per API 609 / MSS SP-67 |
| Body Material | ASTM A216 WCB / ASTM A351 CF8M (SS316) / Ductile Iron EN-GJS-500-7 (GGG50) epoxy-coated / Aluminium alloy (lightweight, on request) |
| Disc Material | SS316 with ENP or chrome plating / Ductile iron EN-GJS-500-7 with EPDM/NBR coating / Aluminium alloy with EPDM coating |
| Shaft Material | SS410 / SS316 / SS304 with bronze bushing or PTFE-lined bushing |
| Seat / Liner Material | EPDM / NBR / Viton (FPM) / PTFE / RPTFE bonded or replaceable liner |
| Face-to-Face | API 609 short pattern or EN 558 Series 20 |
| Operation | Locking lever with 10-position plate (up to 8 inch) / Gear operator (10 inch and above) / Pneumatic / Electric actuator |
| Leakage Class | API 598 / EN 12266-1 Class A -- zero visible leakage for soft-lined valves |
| Temperature Range | -20 deg C to +120 deg C (EPDM) -- up to +150 deg C (NBR) -- up to +200 deg C (Viton FPM / PTFE liner, on request) |
Materials of Construction
| Component | Material |
|---|
| Carbon Steel | ASTM A216 WCB body (standard industrial) |
| Stainless Steel | ASTM A351 CF8M (SS316) body and disc (corrosive / food-grade service) |
| Ductile Iron | EN-GJS-500-7 (GGG50) epoxy-coated body and disc with EPDM/NBR coating (economical water / HVAC) |
| Aluminium Alloy | Aluminium alloy body and disc with EPDM coating (lightweight, on request) |
| Liner Options | EPDM (water / steam / wastewater), NBR (oil / hydrocarbon), Viton FPM (chemical / high temp), PTFE/RPTFE (aggressive chemical) |
Testing & Inspection
| Test | Requirement |
|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | API 609 Category A, MSS SP-67, ASME B16.34 |
Notes
- Liner material (EPDM / NBR / Viton FPM / PTFE) must be specified by the purchaser based on service fluid and temperature.
- For dead-end service, specify lug type with tapped holes and confirm downstream flange bolting can support the full pressure thrust load.
- For high-temperature service (> 120 deg C EPDM limit), Viton FPM or PTFE liner with SS316 body is required; EPDM and NBR are not suitable.
- For potable water service, specify WRAS-approved or NSF-61 certified EPDM liner and coating.
- For abrasive slurry service (sand, tailings), rubber-lined concentric butterfly valve is not recommended -- consider rubber-lined high-performance or knife gate valve instead.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
