YB1 vane pump is an improving product on the basis of YB serial pump, mainly used in the middle-pressure system. According to the demand, the pump can be operating in reverse turn; Any of two single pump in different discharge can be formed into twin pump. There are 119 specs in single pump and twin pump. The pump is widely used in all kinds of lathes, combined lathes, automatic production lines, light industrial machinery, communication machinery, agriculture machinery and the pressing machine hydraulic system.