The structural principle of stainless steel ferrule joint is a small valve used to control micro regulation Its general diameter is 15 mm and 10 mm. The seal is formed by the close fit between the conical screw thread valve core body and the valve seat sealing ring. Needle valves are generally made of alloy steel, but there are also sealing rings of valve heads made of copper alloy. So. Before using needle valve. The material of valve head and valve seat shall be disassembled and inspected. To prevent U-turn or wear during use. In the process of fermentation production, stainless steel needle valve is used more, which plays a certain role in ensuring the tightness. Ferrule type joint has good cutting performance. One of the biggest features is that the contact between the spherical valve core and the inclined surface of the valve seat adopts the form of line contact, which reduces the contact surface and further reduces the leakage rate of the valve.