How many solenoid valves are needed to control the opening and closing of pneumatic regulating butterfly valve? With BS7448 Part 2, Fracture Toughness Test Part 2: Determination Method of KIC Value, Critical CTOD Value and Critical J Value for Welding of Metallic Materials, proposed by British Welding Research Institute in 1997, BS7448 Part 1 has been supplemented for the characteristics of non-uniformity of performance and residual stress in various areas of welded joints, This is the internationally recognized test standard for determining the CTOD fracture toughness of welded joints. For example, API 1104 Appendix A, DNV-OS-401 and BS7910 are all used to assess the integrity of welded structures according to the test specification of fracture toughness CTOD value of BS7448 Part 2.
Automatic pressure relief structure: when the pressure in the middle chamber rises abnormally, the medium in the middle chamber can automatically relieve the pressure by pushing the valve seat with its own thrust, thus ensuring the safety of valve lifting.
