Discover the complete big valve body machining process at JRVAL. From casting preheating to precise CNC turning and 0.1mm threaded hole accuracy.

Huawei engineer: “We installed them and moved straight to the next phase.” When a critical Huawei project was halted by out-of-spec valves from another supplier, JRVAL delivered a solution in just 48 hours.

During a recent factory tour, our Russian clients asked a sharp question: "Why leave lug holes as solid blanks instead of pre-casting them?" Here is the engineering reality behind our CNC machining process.

A case study on achieving zero leakage under -0.01 MPa back pressure via optimized bi-directional sealing.

Step inside Tianjin Jiangrui Steel Casting Co., Ltd. for an exclusive look at our production capabilities. In this video, we host our VIP clients, showcasing our advanced CNC machining, rigorous quality control, and massive assembly lines.

View our EN 10204 3.1 Certificate sample for Lug Butterfly Valves. Verified chemical analysis, API 598 pressure tests & full material traceability.

A source manufacturer's guide to valve machining. See the 4-stage journey from raw casting to precision-machined, pressure-tested valves for quality.

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.