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Help CenterPN16/PN25 Double Eccentric Hard Seal Butterfly Valve for Chemical Processing
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As an ISO9001-certified valve manufacturer since 2016, Shanghai Zhibang Valve specializes in engineering industrial valves for demanding chemical applications. Our PN16/PN25 Double Eccentric Hard Seal Butterfly Valve delivers exceptional leak-tight performance in corrosive environments, featuring precision-machined components and robust construction. With over US$1 million in annual exports to global markets including North America and Europe, we ensure reliable solutions that minimize downtime and maintenance costs.
Key Technical Advantages:
- Double Eccentric Design: Reduces seat friction by 80% compared to concentric valves, extending service life
- Metal-to-Metal Sealing: Hardened stainless steel seats withstand acids, alkalis, and abrasive media
- Zero-Leakage Performance: Bubble-tight shutoff at PN25 pressure ratings (25 bar)
- Corrosion Resistance: Optional CF8M/316SS materials for chloride-rich environments
- Low Torque Operation: 30% less operating torque than single-offset designs
| Parameter | Specification | Benefit |
|---|---|---|
| Body Materials | WCB, CF8, Ductile Iron | Compatibility with diverse chemicals |
| Disc Thickness | 20% thicker than standard | Enhanced pressure resistance |
| Stem Design | Integral forged 17-4PH stainless | Prevents blowout under surge pressure |
| Fire Safe Test | API 607 compliant | Meets hazardous area requirements |
The valve's eccentric shaft positioning eliminates seal rubbing during operation, while the precision-lapped sealing surfaces maintain integrity after 10,000+ cycles. Optional epoxy coatings provide additional corrosion protection for offshore applications. Installation flexibility includes wafer, lug, and double-flanged configurations suitable for ANSI/ASME B16.5 pipelines.
Frequently Asked Questions:
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Q: How does double eccentric design improve valve life?
A: The offset shaft geometry minimizes disc-to-seat contact, reducing wear by 70% in high-frequency applications. -
Q: Can this valve handle sulfuric acid concentrations?
A: Yes, with optional Hastelloy C276 seats for concentrations up to 98% at 80°C. -
Q: What maintenance is required?
A: Annual stem lubrication and seal inspection – maintenance kits available. -
Q: Are pneumatic actuators available?
A: Yes, ATEX-compliant actuators with fail-safe options for automated systems. -
Q: What's the lead time for DN400 valves?
A: Standard sizes ship in 4 weeks; expedited production available. -
Q: Is the valve suitable for steam service?
A: Yes, with graphite seals for temperatures up to 425°C.
Trusted by chemical processors across 15 global markets including Southeast Asia and Western Europe, our valves ship from Shanghai, Guangzhou, and Hong Kong ports with traceable quality documentation. Backed by ISO9001 manufacturing controls and pressure testing per EN 12266-1, this valve delivers 100,000+ cycle durability. Contact our engineering team today for custom material specifications or bulk order discounts – let us optimize your fluid control systems.
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