How to choose a good metal joints

How to choose a good metal joints1, the type of fluid, temperature (see selected for the type of fluid, the temperature of the body material and the sealing material of the metal fitting), the fluid, for the body material, the sealing material is different2, the liquid pressure (see the selected fluid pressure for pressure resistance of the metal fittings), Hydraulic tube fittings  pressure of the fluid quick connector is selected key. Withstand voltage characteristic corresponding to the metal mounting structure is different.3 metal connectors use environment (please select suitable environment construction, materials of metal fittings), combined with the use of environmental conditions of humidity and dust conditions, and easy to use environment, corrosion, etc., to consider the type and selected metal joints body material. 4, the installation of the shape and size