Product Overview

The DN500 (20") PN10 U-section butterfly valve features a ductile iron body with fusion bonded epoxy coating and a ductile iron epoxy coated disc, offering the most cost-effective solution for large-diameter water and industrial applications. The U-shaped body design provides excellent structural rigidity while reducing material weight, and the replaceable dovetail anchored seat allows easy field maintenance without removing the valve from the pipeline.

This valve is the ideal choice for budget-conscious projects that do not require premium disc materials such as stainless steel, aluminum-bronze, or Nylon 11 coating. The epoxy coated ductile iron disc delivers reliable corrosion protection for potable water, raw water, wastewater, and many industrial process fluids at a significantly lower cost.

Key Features

• Ductile Iron Epoxy Coated Disc — ASTM A536 65-45-12 ductile iron disc with fusion bonded epoxy coating (min 250 microns). Provides excellent corrosion resistance for water and wastewater at the most affordable price point. Easily replaceable if damaged.
• U-Section Body Design — U-shaped body profile maximizes structural rigidity while reducing weight compared to traditional round-body designs. Particularly advantageous for large-diameter valves, reducing material costs and making installation easier.
• Dovetail Anchored Exchangeable Seat — Rubber seat locked into body via precision-machined dovetail groove. Can be replaced in the field using simple tools without removing the valve from pipeline.
• Bi-Directional Bubble-Tight Seal — Full rated pressure seal in both flow API598
• Blow-Out Proof Stem — Anti-blowout stem design with double O-ring sealing prevents external leakage.
• ISO 5211 Actuator Mounting — Standardized mounting pad for gearbox, pneumatic, or electric actuator.

Why Choose Epoxy Coated Disc? Significant Cost Savings

Savings example: For a DN500 PN10 U-section butterfly valve, choosing epoxy coated ductile iron disc instead of Nylon 11 coated disc saves approximately – per valve. For a project requiring 50 valves, that's ,000–,500 in total savings — without sacrificing the valve's structural integrity or the replaceable seat feature.

Technical Specifications

Parameter	Specification
Size	DN500 (NPS 20")
Pressure Rating	PN10 (10 bar / 145 psi)
Valve Type	Concentric U-section butterfly valve
Design Standard	GB/T 12238, EN 593, API 609
Face-to-Face	ISO 5752 (Short / Long pattern available)
Flange Drilling	EN 1092-2 PN10, also available ASME B16.5 Class 150
Body Material	Ductile Iron ASTM A536 65-45-12
Disc Material	Ductile Iron + Fusion Bonded Epoxy Coating (min 250 μm)
Stem Material	416 SS / 420 SS / 316 SS (option)
Seat Material	EPDM / NBR / Hypalon / Viton
Body Coating	Fusion Bonded Epoxy, min 250 microns
Temperature Range	depending on seat material
Test Standard	API 598 / EN 12266-1
Operation	Worm Gearbox / Pneumatic Actuator / Electric Actuator
Actuator Mounting	ISO 5211 standard mounting pad

Applications

• Potable water treatment and distribution systems
• Wastewater and sewage treatment plants
• HVAC and building services
• Industrial cooling water systems
• Raw water intake and supply
• Irrigation and agricultural water supply
• Fire protection water systems
• General industrial process pipelines

Why Choose Laux Valve?

• Factory Direct Pricing — . We manufacture everything in-house and pass the savings to you. Our DN500 U-section valve with epoxy disc is priced 15-25% below market average for equivalent quality.
• 15+ Years of Export Experience — Shipped to 45+ countries worldwide with consistent quality
• ISO 9001 Certified — Full quality management system with material traceability
• Short Lead Times — 10-20 working days for standard DN500 configuration
• OEM/ODM Supported — Custom branding, packaging, and special requirements welcome

Frequently Asked Questions

Q: Is the epoxy coated disc durable enough for long-term service?

A: Yes. Fusion bonded epoxy (FBE) coating is a thermoset polymer powder coating that provides excellent adhesion and corrosion resistance. For potable water and wastewater service, the epoxy coated disc typically lasts 10-15 years. The coating is applied at min 250 microns thickness and is holiday-tested to ensure pinhole-free coverage.

Q: How much cheaper is the epoxy disc version compared to Nylon 11?

A: The epoxy coated disc version is approximately 40-60% cheaper than the Nylon 11 (Rilsan) coated version for DN500. If your application is standard water or wastewater, the epoxy disc is the most cost-effective choice and there is no technical reason to pay more for Nylon 11 coating.

Q: Can the disc be replaced if the coating is damaged?

A: Yes. The disc is a separate component and can be easily replaced. A replacement epoxy coated disc for DN500 costs significantly less than replacing the entire valve. Contact our parts department for pricing.

Q: What is the lead time for DN500 U-section butterfly valve?

A: Standard configuration (epoxy disc, EPDM seat, worm gearbox) lead time is 10-20 working days. Custom configurations may require 20-30 working days. Express production available for urgent orders.

Q: Do you provide samples for testing?

A: Yes, sample orders are welcome. We offer sample discounts for first-time buyers. The sample lead time is 15-25 working days including production and shipping.

Q: Can this valve be used for dead-end service?

A: The U-section butterfly valve with dovetail seat can be used for dead-end (isolation) service at the full pressure rating when installed with proper flange support. Consult our technical team for specific dead-end application requirements.

Ordering Information

For pricing, technical drawings, or customization requests, contact our sales team:

Email: laux@lauxvalve.com | Tel / WhatsApp: +86 18920833829

Please provide the following information for a quotation: size (DN500), pressure rating (PN10), quantity, seat material, operation type, and flange standard.

Butterfly Valve Manufacturing Process
From Technical Confirmation to Final Delivery



Standardized Quality Control Process

From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.

International Certifications

Manufactured to international quality standards and certified for global industrial and potable water applications.