Bellow Seal Valve is specially made not to have leak at Valve Packing. Instead of using standard Compression Packing, Stainless Steel Bellow is used. The wide application is for Thermal Oil whereby a drop of it causes Fire. Also Chlorine Gas which is Health Hazard when leaks.
Hitachi M10K-FGB series 10K Ductile Iron Bellow Seal Valve flange connection.
Bellow Seal Valve is used for Critical Processes like High Temperature Steam & Combustible Thermal Oil. It is important to have reliable Body materials so as not to crack at Bonnet and Flange. VMV understand the problem and uses Carbon Steel material. Furthermore, normal design of Disc is using Flat Disc which with foreign materials, impurities deposit causes Disc not to close tightly. Using force on hand wheel, often causes Bonnet to crack.
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