BM serial comes in seven models. Its maximum flow rate of 30L/min and a maximum pressure of 250Bar. And because of the different crank shaft diameter, subdivided into two series. Selected forged brass pump head, high strength, no pores, long life, safe operation. The plunger is precision machined solid porcelain spray plunger to extend its durability and applicability. Better oil seal system with stainless steel spring to ensure enough tension, "U" type "Buna-N" material low pressure water seal design to enhance pump performance, improve service life of the plunger support guide ring to ensure plunger coaxiality, prolong the service life of the water seal and plunger.