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system, double pump system and pump system more.3)Press the dissimilarity of pump the form with the liquid by, can is divided into the fixed amount pump system and change the quantity pump advantage that changes to measure the pump is to regulate the scope inside, can make use of the power of launch the machine well, but its structure and the manufacturing craft plications, the cost is high, can is divided in to move to change the quantity, control to change the quantity possibly, servo change the quantity, pressure to pensate to change the quantity, press to change the quantity, liquid to press to change to measure various ways of etc..4)Press toward performance the ponent to provide the dissimilarity of the oil method, can is divided in to establish the system and merge the in the system, it is next performance ponent that previous performance ponent return to oil of into oil, pass a performance ponent pressure and will lower once each establish system, the each performance ponent that be the lord pump toward many roads valve control provides the oil, as long as the liquid presses the exit pressure of the pump enough, the pound of the sport that can carry out each performance ponent the pressure of the performance ponent is to fold to add of, so overe