... and pressure shock proof exists, or pressure is released suddenly in the course of manufacturing, or working environment shock largely. The ... chemical, Power stations, etc. DESCRIPTION Nominal Size : 1.5"(40mm) , 2.0"(50mm), 2.5"(63mm), 3.0"(75mm) ,4.0"(100mm),Pressure Range ... We are a manufacturer of press instruments, and are specialized in producing and developing. After almost 20 years of effort, ...