In high-end manufacturing, automation meets craftsmanship. To guarantee zero thread defects in our small-diameter lugged butterfly valves, we utilize a strict 3-pass tapping process. By combining high-speed machine roughing with a final manual tactile calibration, and using eco-friendly vegetable oil, we achieve a mirror-like surface finish and ensure smooth bolt installation on every job site.

A complete engineering guide comparing Chemical Composition, Mechanical Properties, and Applications of standard and exotic valve body materials.

JRVAL’s JIS F 7480:1996 guide for marine rubber-seat butterfly valves covers JIS 5K lug valve dimensions DN50–DN1200, face-to-face data, JIS B 2220/B 2239 flange patterns, ISO 5211 actuator mounting and JIS F 7400 inspection.

Compare global butterfly valve standards, including API, ASME, EN, ISO, AWWA, JIS and GB systems, dimensions, ratings and industrial applications

Ultimate guide to the new GB/T 12221-2025 standard for butterfly valve face-to-face dimensions. Includes updated flanged & wafer valve tables

Ultimate quick reference guide for valve machining standards (GB), tolerances (GB/T 1804, 1184), surface roughness, and face-to-face dimensions.

Recent shipment of fully lined wafer check valves! Discover the benefits of 100% rubber isolation and why global projects trust JRVAL's foundry.

Step onto the shop floor with JRVAL. In this technical breakdown, we explain the difference between boring the nominal diameter (DN) and machining the internal structure of a butterfly valve body, showcasing our heavy-duty CNC capabilities.