Each specification of double spherical rubber joint should be made in advance to determine the welding parameters by making qualified welding samples before the official welding seam is welded. When welding the official seam, each specification of the double spherical rubber joint should be confirmed by opening and closing the sample welding parts, and the welding parameters of each part must be printed out on the automatic welding machine and kept in the corresponding welding parts. All pipelines, valves and pressure gauges are made of high quality double spherical rubber joints, and they are all standard fittings. All gas outlets are double spherical rubber joints.
