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Technical Datasheet -- Concentric Rubber-Lined Butterfly Valves for General Industrial and Water Service
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.
| 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) |
| 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) |
| 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 |
| Standard | Description |
|---|---|
| Design Standard | API 609 Category A, MSS SP-67, ASME B16.34 |
The Concentric Butterfly Valve -- Wafer / Lug SS316 EPDM is designed, manufactured, and tested in accordance with applicable API / ASME / BS / ISO international standards. Compliance documentation and Material Test Certificates (EN 10204 3.1) are provided with every order.
Standard construction is carbon steel, stainless steel (CF8 / CF8M), and special alloy grades. Alternative and upgraded grades -- Duplex, Super Duplex, Inconel, Monel, Hastelloy, and NACE MR0175 trims for sour service -- are available on request.
It is offered in a range of sizes as per the technical specification with standard ANSI / ASME pressure classes (PN ratings on request). End connections include flanged (RF / RTJ), butt-weld, socket-weld, and screwed ends as per specification.
Yes. Supreme Valves India is an established exporter of industrial valves to Saudi Arabia (KSA), the UAE, Qatar, Kuwait, Oman, Bahrain, and across the Gulf. We provide sea-worthy export packing, EN 10204 3.1 / 3.2 certification, certificate of origin, and support for SABER / SASO conformity on KSA shipments.
Every valve undergoes hydrostatic shell and seat testing per API 598 / ISO 5208. Documentation includes EN 10204 3.1 MTC (3.2 on request), NDT reports, and fire-safe (API 607) or NACE MR0175 certification where applicable. Third-party inspection by TÜV, SGS, Bureau Veritas, or Lloyd's Register can be arranged.
Order quantities are flexible -- from single units for stocked items to bulk volumes for project requirements. Lead time depends on size, material, and quantity; please contact our team with your specification for a firm delivery schedule and quotation.