14" Lug Butterfly Valve with Chainwheel — HEPDM Seat | DN350

1. Product Overview

The 14-inch (DN350) lug type butterfly valve from Laux Valve is a heavy-duty flow control solution designed for reliable performance in water supply, wastewater treatment, HVAC, and industrial process systems. This valve features a precision-molded HEPDM (Hydrogenated EPDM) seat — an advanced elastomer that offers superior heat resistance, chemical resistance, and long-term sealing performance compared to standard EPDM rubber.

Equipped with a durable chainwheel operator, this lug butterfly valve enables easy manual operation even in elevated or hard-to-reach installation positions. The chainwheel mechanism provides smooth, geared operation with minimal effort, making it ideal for pipelines installed overhead, in valve pits, or in confined spaces where direct lever access is not feasible.

The lug-style body design incorporates fully threaded bolt holes on both flanges, allowing dead-end service at full rated pressure per Class 150 (PN16) — a critical safety feature for pipeline isolation, downstream maintenance, and end-of-line applications. Manufactured and tested in accordance with API 609, EN 593, and MSS SP-67 standards, this valve delivers leak-free bi-directional shut-off and long-term reliability in demanding service conditions.

2. Key Features & Benefits

• HEPDM Seat — Advanced High-Temperature Elastomer: Hydrogenated EPDM (HEPDM) offers significantly improved heat resistance (up to +150°C / +302°F) and chemical resistance compared to standard EPDM. HEPDM provides excellent resistance to steam, hot water, ozone, weathering, and diluted acids/alkalis, making it ideal for demanding industrial applications. The material also meets WRAS and NSF 61 standards for potable water contact.
• 14-Inch (DN350) Large Diameter: Designed for high-flow-rate pipelines in municipal water distribution, industrial cooling systems, and wastewater treatment plants. The full-bore design minimizes pressure drop across the valve, reducing energy consumption and pumping costs in continuous operation.
• Chainwheel Operator — Easy Overhead Operation: The heavy-duty chainwheel actuator allows convenient manual operation from ground level when the valve is installed at height. The chainwheel provides 4:1 gear ratio reduction for smooth, low-effort open/close operation. Standard chain length: 2 meters (customizable). The chainwheel is fully enclosed for operator safety and weather protection.
• Lug Style Body — Dead-End Service Capability: Threaded bolt inserts on both flanges enable secure installation between ANSI B16.5 Class 150 flanges. The lug design supports dead-end service at full rated pressure, eliminating the need for a downstream flange during maintenance and allowing isolation of one side of the pipeline without system depressurization.
• Bi-Directional Tight Shut-Off: The interference-fit HEPDM seat provides bubble-tight bi-directional sealing in accordance with ANSI FCI 70-2 Class VI (zero leakage). The seat is fully replaceable without special tools, reducing maintenance downtime and replacement costs.
• ISO 5211 Top Flange — Direct Actuator Mounting: The valve top flange complies with ISO 5211 standard, enabling direct mounting of the chainwheel gearbox (and future upgrade to pneumatic or electric actuator if required) without additional brackets or adapters.
• Anti-Blowout Stem Design: The one-piece stainless steel stem incorporates an anti-blowout retention feature, ensuring the stem remains securely retained within the valve body even under high-pressure conditions. Maximum operational safety for personnel and surrounding equipment.
• Durable Epoxy Coating: The ductile iron body is coated with high-build epoxy paint (standard RAL 5015 blue, 80-120 microns thickness) for exceptional corrosion protection in water and wastewater environments. Custom coating colors and specifications available on request.
• Full Material Traceability: Every valve receives a unique serial number with complete traceability: raw material certifications (MTC 3.1), dimensional inspection records, hydrostatic test reports, and seat leakage test results.
• 100% Factory Tested: Each valve undergoes hydrostatic shell test (1.5x rated pressure) and seat leakage test (1.1x rated pressure) before shipment. Test certificates included with every order.

3. Technical Specifications

4. Dimensional Data (14" / DN350)

5. HEPDM vs Standard EPDM — Why HEPDM?

6. Typical Applications

• Municipal Water Supply & Distribution: 14" lug butterfly valves with chainwheel are widely used in water treatment plants, pumping stations, and main transmission pipelines for reliable flow control and isolation at elevated or underground installation points.
• Wastewater Treatment: HEPDM seat provides excellent resistance to sewage gases, diluted chemicals, and hot water commonly found in municipal and industrial wastewater applications. The chainwheel operator enables convenient operation in valve pits and galleries.
• HVAC & District Heating: Ideal for hot water circulation systems, district heating networks, and cooling water loops where HEPDM's high-temperature rating and chainwheel's ease of operation are both critical.
• Industrial Process Piping: Suitable for chemical processing, power generation, pulp and paper, food processing, and mining industries where reliable isolation and dead-end service capability are required.
• Fire Protection Systems: Lug butterfly valves with chainwheel are commonly installed in fire water storage tanks, sprinkler riser systems, and fire pump houses where overhead installation is standard practice.
• Irrigation & Agricultural Water Systems: Large-diameter irrigation pipelines benefit from the valve's low maintenance, dependable sealing, and easy chainwheel operation in remote field locations.
• Marine & Offshore: Suitable for seawater cooling systems, ballast water treatment, and shipboard piping where corrosion resistance and reliable operation in confined spaces are essential.
• Mining & Mineral Processing: Process water lines, tailings management, and slurry isolation applications benefit from the valve's robust ductile iron construction and HEPDM seat durability.

7. Standards & Certifications

• Design Standard: API 609, EN 593, MSS SP-67
• Face-to-Face: API 609 Table 1, EN 558 Series 20
• Flange Connection: ASME B16.5 Class 150, EN 1092-1 PN10/PN16
• Testing Standard: API 598, EN 12266-1
• Top Flange: ISO 5211
• Quality Management: ISO 9001:2015 Certified
• CE / PED: Available on request
• WRAS: Approved for potable water contact (UK)
• NSF 61 / 372: Certified for drinking water systems (USA)

8. How to Order

When placing an inquiry or order, please provide the following information for accurate quotation and configuration:

1. Size: 14" / DN350
2. Pressure Rating: Class 150 / PN16
3. Body Material: Ductile Iron / Cast Iron / Carbon Steel / Stainless Steel
4. Disc Material: Ductile Iron Epoxy Coated / CF8M (316 SS) / CF8 (304 SS)
5. Seat Material: HEPDM / EPDM / NBR / PTFE / FPM (Viton)
6. Operator: Chainwheel (standard) / Manual Gearbox / Pneumatic Actuator / Electric Actuator
7. Chain Length: Standard 2m or custom length
8. Coating: Standard RAL 5015 Blue / Custom RAL color
9. Quantity: Required number of units and delivery schedule
10. Special Requirements: Extended stem, special testing, certification documents (3.1/3.2), third-party inspection

9. Why Choose Laux Valve?

10. Packaging & Shipping

• Packaging: Heavy-duty plywood crate or steel-framed wooden case, suitable for sea freight. Each valve individually wrapped and secured. Flange faces protected with plastic caps. Chainwheel and chain packed separately with installation hardware.
• Shipping Documents: Commercial Invoice, Packing List, Bill of Lading / Air Waybill, Certificate of Origin (COO), Material Test Certificate (EN 10204 3.1), Hydrostatic Test Report, Valve Tag with serial number.
• Port of Loading: Tianjin Port, China (as requested)
• Shipping Terms: FOB / CIF / CFR / EXW / DDP
• Lead Time: 7-15 working days for standard configuration; 15-30 working days for custom orders

11. Warranty

Laux Valve provides a 12-month warranty from the date of shipment against manufacturing defects in materials and workmanship under normal use and service conditions. Warranty covers replacement or repair of defective valves at no charge. Excludes damage caused by improper installation, misuse, unauthorized modification, or normal wear of replaceable seat/seal materials.

12. Contact Laux Valve

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.