YB series Sliding vane pump is with by-pass valve built-in. The pump uses a rotor with sliding vanes to drive the liquid transfer. The material of construction is nodular cast iron with self-lubricating vanes. Due to its superior performance, the pump can handle viscous and volatile liquid and require less horsepower than other equivalent pumps. The pump has its obvious advantage in the transmission of high flow at low revolution. http://www.jiasongchina.com/