Key Features

• CF8M (316 SS) Disc — Corrosion-resistant stainless steel disc delivers superior performance in water, wastewater, and chemical services compared to standard coated ductile iron discs
• Ductile Iron Body — ASTM A536 Grade 65-45-12 ductile iron with fusion-bonded epoxy coating (min 250 microns) for long-term corrosion protection
• Worm Gear Operator — Self-locking worm gearbox provides precise disc positioning and safe operation for large-diameter valves. Handwheel with position indicator standard
• Double Flange Design — Flanged connections on both ends (ANSI B16.5 Class 150) allow dead-end isolation service and easy installation or removal
• AWWA C504 Compliant — Designed, manufactured, and tested per AWWA C504 standard for rubber-seated butterfly valves
• Reinforced EPDM Seat — Full rubber lining with vulcanized bonding provides bubble-tight Class A shut-off per API 598
• ISO 5211 Mounting Pad — Standardized actuator mounting interface for future upgrade to pneumatic or electric actuation
• 100% Pressure Tested — Every valve undergoes hydrostatic shell test and seat leakage test per API 598

Technical Specifications

CF8M Disc Advantage

Unlike standard ductile iron discs with epoxy or nylon coatings that can chip, crack, or degrade over time, the CF8M (316 stainless steel) disc provides:

• Inherent corrosion resistance — No coating to fail or require touch-up
• Superior erosion resistance — Withstands higher flow velocities and suspended solids
• Lower operating torque — Smooth surface finish reduces friction against the rubber seat
• Longer service life — Outlasts coated discs in aggressive water and chemical environments
• Full material traceability — Each disc comes with mill test certificate (MTC)

Worm Gear Operator Features

• Self-locking worm gear mechanism prevents reverse rotation
• 2" or 2-1/2" handwheel with rotating handle for comfortable operation
• Visual open/closed position indicator
• Weatherproof housing (IP65 rated)
• ISO 5211 input flange for actuator conversion
• Mechanical travel stops in open and closed positions

Applications

• Municipal water treatment and distribution
• HVAC and district cooling systems
• Industrial process water and cooling
• Fire protection water supply
• Irrigation and agricultural water systems
• Wastewater treatment plants
• Power plant cooling water circuits

Frequently Asked Questions

What is the difference between double flange and wafer butterfly valves?

Double flange butterfly valves have flanged connections on both ends of the body, allowing dead-end service and easy installation without flange spreaders. Wafer valves are clamped between two pipe flanges and cannot provide dead-end isolation. Double flange valves are preferred for larger diameters (24" and above) where installation and maintenance access are important.

Why choose a CF8M disc over an epoxy-coated disc?

CF8M (316 SS) provides inherent corrosion resistance that does not rely on coating integrity. If the epoxy coating on a coated disc is damaged during installation or operation, corrosion begins immediately at the damage point. CF8M discs also offer lower operating torque, longer service life, and full material traceability with mill test certificates.

What is the torque range for the gear operator?

The worm gear operator for a 36" valve delivers a mechanical advantage of approximately 40:1 to 60:1, reducing the handwheel force to a comfortable 30-50 Nm for normal operation. The gearbox is sized to handle the maximum breakaway torque of the valve under full rated pressure differential.

Can this valve be upgraded to pneumatic or electric actuation later?

Yes. The valve is equipped with an ISO 5211 standard mounting pad. The gearbox can be removed and replaced with a pneumatic or electric actuator without modifying the valve. This future-proofs your installation for automation upgrades.

What is the delivery time for a 36" double flange butterfly valve?

Standard delivery for the 36" valve is 15-25 working days depending on the configuration and quantity. Custom material options (such as Hypalon lining or 316 SS body) may extend lead time by 5-10 working days. Contact our sales team for current lead times.

Ordering Information

For pricing, technical drawings, or actuator sizing, contact our sales team.

Email: james@lauxvalve.com | Tel: +86 18920833829

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.