Integrated intelligent pneumatic high-performance ball valve water meter Tsinghua University conducted CTOD tests on common bridge steels Q370qE and Q345qD, and calculated the CTOD values of materials under brittle fracture, ductile brittle failure and ductile failure respectively, as the basis for revising the conventional impact toughness standard.
1. The fundamental way to avoid cavitation from the perspective of pressure is to prevent the use pressure difference of valve body parts from being greater than the large allowable pressure difference of zui. For zui large allowable differential pressure Δ PT is represented as Δ PT=KC（P1-PV） , （4）
