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China Suppliers Factory Lever Operated Lug Type Butterfly Valve API609 PN16 Cast Iron DN25-DN300
★ Features
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Achieves bubble-tight sealing at the full rated pressure.
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Only two valve components—the seat and the disc—come into contact with the flowing medium.
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Engineered for optimal performance in applications involving abrasive or erosive media.
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Features a replaceable cartridge seat. The seat consists of a reinforced backing ring with the elastomer seat material vulcanized onto it. When the valve is installed between pipe flanges, this stable seat remains resistant to deformation or displacement. The cartridge construction also prevents issues such as stretching or bending of the elastomer in front of the moving disc during valve cycling.
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Offers a wide range of material combinations.
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Equipped with a standardized actuator flange to simplify operator interchangeability.
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A top bushing absorbs side thrust loads.
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Hub sealing is achieved through preloaded contact between the flattened seat surface and the disc hub area, ensuring positive sealing at any disc position.
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The one-piece wafer-thin disc and stem design minimizes flow obstruction.
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The seat can be replaced in the field, isolating the body and stem from the flow path.
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Molded‑in O‑rings provide flange sealing, eliminating the need for separate gaskets.
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Universal mounting flange: The integrally cast actuator flange conforms to ISO 5211 standard dimensions, enabling compatibility with a variety of operators—including 10‑position handle kits, gear operators, electric actuators, and pneumatic actuators.
⚙ Materials Of Main Parts
| ITEM | PART NAME | MATERIAL |
|---|---|---|
| 1 | Body Material | Cast iron / Ductile iron / CF8 / CF8M / WCB / Duplex / Al-Bronze / Aluminium Etc. |
| 2 | Seat Material | EPDM / NBR / Buna / Viton / PTFE / Hypalon / Silicone / Neoprene Etc. |
| 3 | Stem Material | 45# / SS420 / SS410 / SS416 / SS316 / SS304 / Duplex stainless steel Etc. |
| 4 | Disc Material | DI+Ni, CF8, CF8M, CF3M, Duplex SS, Al-Bronze, DI+Nylon, DI+PTFE, DI Epoxy Etc. |
| 5 | Hand Lever | Malleable iron / Stamping steel / Aluminum / Stainless Steel |
| 6 | Bushing | PTFE / Bronze |
| 7 | O Ring | NBR / EPDM / VITON |
📝 Valve Standard
| Category | Details |
|---|---|
| Type | Lugged |
| Face to Face | API609, EN593, EN558-1 Series 20, DIN3202 K1, ISO5752 |
| Flange Drilling | EN1092 PN6 / PN10 / PN16 / JIS 5K / 10K / ANSI150 / AS Table D/E / SANS |
| Mounting Flange | ISO5211 |
| Pressure Rating | PN10, PN16, 150PSI, 200PSI, Class 150 |
| Application | HVAC, Water Supply & Sewage, Food & Beverage, Chemical / Petrochemical Processing, Power and Utilities, Paper and Pulp, Marine |
💾 Dimensions (mm)
🔍 More Details
❓ Frequently Asked Questions
Q
What does "bubble-tight sealing" mean for a lug butterfly valve?
Bubble-tight sealing means the valve achieves zero leakage at its full rated pressure. This is made possible by the close contact between the elastomer seat and the disc, ensuring no fluid or gas passes through even under maximum operating conditions.
Q
Can the seat of this lug butterfly valve be replaced in the field?
Yes. The replaceable cartridge seat design allows field replacement without removing the entire valve body or stem from the pipeline. This significantly reduces maintenance downtime and overall cost of ownership.
Q
What actuator types are compatible with this valve?
The integrally cast actuator flange conforms to ISO 5211 standard dimensions, making it compatible with a wide range of operators including 10‑position handle kits, gear operators, electric actuators, and pneumatic actuators.
Q
What seat materials are available and how do I choose the right one?
Available seat materials include EPDM, NBR (Buna), Viton, PTFE, Hypalon, Silicone, and Neoprene. Selection depends on the media type, temperature, and chemical compatibility. For example, EPDM suits water and mild chemicals, Viton is preferred for oils and aggressive chemicals, and PTFE is ideal for high-purity or highly corrosive applications.
Q
What pressure ratings does this lug butterfly valve support?
This valve supports pressure ratings of PN10, PN16, 150 PSI, 200 PSI, and ANSI Class 150, making it suitable for a wide range of industrial and commercial piping systems.
Q
What are the typical applications for this lug butterfly valve?
This valve is widely used in HVAC systems, water supply and sewage treatment, food and beverage processing, chemical and petrochemical plants, power generation and utilities, paper and pulp industries, and marine applications—thanks to its broad material compatibility and robust design.