FAQ1: Which ASME standards does the Lug Butterfly Valve comply with?
Our ASME Lug Butterfly Valve is strictly designed and manufactured in accordance with the following standards: valve body design conforms to ASME B16.34, flange connection dimensions comply with ASME B16.5, pressure-temperature ratings are based on ASME B16.34, and pressure testing is performed per API 598. The product is also compatible with ASME Class 125/150 and PN16 flange specifications. Compliance certification documents for specific pressure classes (e.g., Class 150/300/600) are available upon request.

FAQ2: What is the difference between a Lug type and a Wafer type butterfly valve? When should I choose a Lug type?
A Lug type butterfly valve features threaded lugs around the valve body, allowing the valve to be independently bolted to each side flange, whereas a Wafer type butterfly valve is clamped between two flanges and relies on the flange bolts for fastening. The key advantage of the Lug type is that it supports dead-end isolation service — one side flange can be removed individually for maintenance without shutting down the entire pipeline. If your application requires section-by-section maintenance, dead-end pipeline isolation, or involves higher working pressure, the Lug type is recommended.

FAQ3: What materials are available for the valve body, disc, stem, and seat?
We offer a wide range of material combinations to meet different operating conditions. Valve body materials include ductile iron, WCB carbon steel, and CF8/CF8M stainless steel. The stem is made of stainless steel to ensure strength and corrosion resistance. The disc is available in stainless steel or ductile iron. Seat materials cover EPDM, NBR, PTFE, RPTFE, and metal hard-seated options, which can be flexibly selected based on media temperature, corrosiveness, and pressure. Please provide your specific operating parameters, and our technical team will recommend the optimal material solution for you.

FAQ4: What operation methods and actuation types does this valve support?
Our ASME Lug Butterfly Valve supports multiple operation methods, including manual (lever), gear operator, pneumatic actuator, electric actuator, and hydraulic actuator. Pneumatic actuators can also be configured with fail-safe functions (Fail Open / Fail Close), which automatically open or close the valve in the event of air supply failure to ensure system safety. All actuator mounting interfaces comply with the ISO 5211 standard for easy on-site installation and replacement. For specific selection recommendations, please provide the valve size, working pressure, and media parameters, and we will prepare a detailed solution for you.