... liquid2) Temperature preservation is equipped with standard electric water heater setting,automatic temperature control exchanger, and increased anode magnesium ... ,Working pressure,4Mpa,welding pressure 4MpaDust Ring GasketSilicon Rubber Vacuum Tubetri-element tube,High boron and silicon content 3. ... ,Gradual change SS-AL-Nx/Cu selective absorption coating,Vacuum Degree,P<=5*10-4,Service Life,10 years ...