Shandong Hengtong expansion joint manufacturing Co., Ltd. is a large-scale expansion joint manufacturing enterprise integrating R & D, design, manufacturing, sales and service. The company has obtained China's special equipment manufacturing license, A1 level qualification of pressure vessel, a and B qualification of pressure pipeline components, and obtained EU ped-ce certification, American ASME "U" steel seal, ISO 9000 quality management system certification, GB / T 14000 environmental management system certification and GB / T 45000 occupational health and safety system certification. Expansion joint products include pressure pipe bellows expansion joint, pressure vessel bellows expansion joint, metal bellows, metal hose