Key Features

• Nylon Coated Disc — Electrostatic nylon (polyamide 11) powder coating provides superior corrosion resistance in seawater, wastewater, and aggressive water environments. Coating thickness 250-350 microns.
• Double Flange Design — Flanged connections on both body ends (ANSI B16.5 / EN 1092-2) allow dead-end service and easy installation/removal without disturbing adjacent piping.
• Pneumatic Actuator — Heavy-duty scotch yoke or rack & pinion actuator, double-acting or spring-return. Features position indicators, solenoid valve, and limit switch box.
• Ductile Iron Body — ASTM A536 Grade 65-45-12 ductile iron with fusion-bonded epoxy coating (min 250 microns) for long-term corrosion protection.
• AWWA C504 Compliant — Designed and tested per AWWA C504 standard for rubber-seated butterfly valves.
• ISO 5211 Mounting Pad — Standardized actuator mounting interface for direct actuator installation without adapter brackets.
• Bubble-Tight Shut-Off — EPDM rubber seat with reinforced backup ring provides Class A zero leakage.

Technical Specifications

Nylon Coated Disc Advantages

The nylon (polyamide 11) coating on the valve disc offers significant advantages over traditional epoxy or rubber coatings:

• Superior corrosion resistance — Nylon 11 is virtually impermeable to water, salts, and chemicals, providing excellent protection in seawater and wastewater environments
• High abrasion resistance — The tough nylon surface resists erosion from suspended solids in slurry and raw water applications
• Smooth surface finish — Low friction coefficient reduces operating torque and prevents fouling or scaling buildup
• FDA compliant — Nylon 11 is approved for potable water contact (NSF 61 / WRAS compliant available)
• Impact resistant — Unlike brittle epoxy coatings, nylon absorbs impact without cracking or chipping

Pneumatic Actuator Specifications

Applications

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

Available Options

• Actuator: Pneumatic (double-acting / spring-return) or Electric actuator available
• Disc Coating: Nylon 11 / Epoxy / Halar (ECTFE) / Rubber lining
• Seat Material: EPDM / NBR / Viton / PTFE lined
• Body Coating: Fusion bonded epoxy / RAL color / 3-layer FBE
• Positioner: Siemens / ABB / Emerson / YTC smart positioners
• Auxiliaries: Boosters, quick exhaust valves, lock-up valves, travel stops

Frequently Asked Questions

What is the advantage of a nylon coated disc compared to epoxy coated?

Nylon (polyamide 11) coating offers superior corrosion resistance in seawater and wastewater environments. It is more impact-resistant than brittle epoxy coatings, provides a smoother surface finish that reduces operating torque, and is FDA/NSF 61 approved for potable water contact. The coating thickness of 250-350 microns also provides excellent abrasion resistance against suspended solids.

What is the difference between double acting and spring return pneumatic actuators?

A double acting actuator uses air pressure to both open and close the valve, requiring two air supply lines. A spring return actuator uses air to open (or close) the valve and a spring to return it to its fail-safe position when air pressure is lost. Spring return actuators are recommended for fail-safe applications where the valve must close (or open) automatically in the event of power or air supply failure.

What is the ISO 5211 mounting standard?

ISO 5211 is the international standard for mounting interfaces between valves and actuators. It defines the bolt pattern dimensions, drive coupling size, and mounting pad height for direct actuator mounting. Using ISO 5211 compliant valves ensures that actuators from different manufacturers can be directly mounted without custom adapter brackets, simplifying procurement and replacement.

Can this valve be used for dead-end service?

Yes. The double flange design allows dead-end service, meaning the valve can be installed at the end of a pipeline with a blind flange while maintaining full pressure rating. This is a key advantage over wafer type butterfly valves, which require two flanges for proper installation and cannot hold pressure at the downstream side when only one flange is connected.

What maintenance does a pneumatic actuated butterfly valve require?

Routine maintenance includes: checking air supply pressure and filtration every 3 months, inspecting actuator linkage and limit switch adjustments every 6 months, verifying bubble-tight shut-off annually, and replacing actuator seals every 3-5 years depending on cycle frequency. The valve seat should be inspected during scheduled shutdowns and replaced if any leakage is detected.

What is the minimum air pressure required for the pneumatic actuator?

The standard pneumatic actuator requires a minimum supply pressure of 4 bar (60 PSI) and operates optimally at 5.5-7 bar (80-100 PSI). For spring return actuators, the minimum pressure required to fully compress the spring depends on the spring range — typically 5.5 bar for standard springs. Please consult our technical team for precise sizing based on your specific pressure conditions.

Ordering Information

For pricing, technical details, 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.