High efficiency, stable rotation under high pressure special pressure control mechanism and forced balance mechanism, cam ring three-point support ¡El bracing method greatly improves the rotation and performance at high pressure, and can also exert high efficiency and stability at 1421 bar performance. No vibration, no noise using several kinds of sound insulation, vibration prevention of the new mechanism, especially can improve the stability of the rotation of the convex transport ring qualitative. A special three-point support method formed by the control piston and the offset piston reduces cam ring vibration and rotation No noise when turning. Responsive, high-precision new cam ring control mechanism, cam ring without displacement, thereby improving the reaction Sensitivity, starting, stopping, load changes do not change the precision. Sensitive characteristics, flow stability brand new pressure balanced pressure control mechanism, in the high pressure state amount also It can be highly smooth. High efficiency rotation, reduce energy loss With a new mechanism to reduce energy loss, especially high voltage without output when the energy loss is more significantly reduced. Maintenance, overhaul easy pressure adjustment mechanism and flow adjustment mechanism on the same side, in order to maintain the adjustment.