Tianjin Pumps & Machinery Group is main state-run enterprise and carry out scientific research manufacture trade and marketing. Tianjin Pumps & Machinery Group Co., Ltd. was established in 1956. The first screw pump and the first marine centrifugal pump in China were made here. It was named the 500 larges mechanical industrial enterprises of the state by the Statistical Bureau of the state. The main products include: single, double, three screw pump, marine and land pump, self-priming oil pump, gear pump, screw compressor, screw freezer, centrifugal fresh water pump, submarine electronic pump, horizontal or vertical multi-centrifugal pump and universal mechanical products.