Hebei Huahui Valve Co., Ltd

Stainless steel butterfly valves will appear rusty when they are in use. Many friends don't know what caused it. Today the butterfly valve manufacturer will tell you about this problem. Let's learn about it with the   Butterfly Valve Supplier . Stainless steel butterfly valve will rust during use. Through metallographic analysis, dyeing test, heat treatment test, SEM and other tests, it is found that the key factor for material corrosion is the precipitation of carbides along the grain boundaries to form chromium-depleted areas, which causes the stainless steel butterfly valve to rust. Material CF8M stainless steel butterfly valve rusts during use. After austenitic stainless steel undergoes normal heat treatment, its structure should be austenite at room temperature, and its corrosion resistance is very good. Analyze the cause of butterfly valve corrosion. Butterfly Valve The stainless steel butterfly valve material is nickel-chromium austenitic stainless steel, which is usuall...

  Butterfly Valve Gate valves are mostly used in steam pipelines and large-diameter water supply pipelines. Since fluid resistance is generally required to be small, gate valves are used. In the gate valve, the hand wheel rotates and the valve stem moves upward. The flow rate is different, the gate valve is required to be fully opened. A higher installation space is required, and the sealing surface of the gate valve has a certain self-sealing ability. Its valve core is in tight contact with the sealing surface of the valve seat by the medium pressure to achieve tightness and leak-proofness. The inclination of the valve core of the wedge gate valve is generally 3-6 degrees. When the valve core is forced to close excessively or the temperature changes greatly, it is easy to jam. Therefore, high temperature and high pressure wedge gate valves have taken certain measures to prevent the valve core from jamming in the structure. When the gate valve is opened and closed, the valve core a...

BS5163 Spur gear Resilient Seated Gate Valve with bypass Product Description gate valve with bypass  Features The ductile iron core is fully vulcanized with EPDM rubber, no iron parts are exposed to the medium and the excellent rubber vulcanization prevents creeping corrosion underneath the rubber. Guides in the wedge and on the valve body ensure a uniform closure, safe operation ensured as the guides prevent overloading of the stem. Stainless steel stem with rolled threads for high strength. The valve can replace stem seals under pressure. Full bore. Body inside and outside fusion bonded epoxy coating with excellent corrosion resistant performance.  gate valve  with bypass Standard Design standard BS5163, EN1171 Flange drilling standard EN1092-2 PN10/PN16 Face to face standard EN558-1 Series 3 Hydraulic test standard EN1074-1 and 2 /EN12266   Seat:1.1*PN(in bar), Body:1.5*PN(in bar)