This series of surge tanks are mainly used in medium and low pressure gas transmission and distribution systems. It is composed of filter, pressure regulator (self-break, release function), ball valve, pressure gauge and box body; compact structure, convenient maintenance and safe use. It is suitable for small and medium-sized user places such as civil buildings, apartments, hotels and restaurants; it can also be used for low-pressure gas boilers and small direct-fired steam turbines. The box body is made of stainless steel, cold-rolled steel sprayed with plastic, and glass fiber reinforced plastic.