1.The cartridge valve in the operation of hydraulic machine, because the smaller the reset spring force, so the valve state of the main decisions on the role in A, B, X three cavity fluid pressure, Pa, and Pb by the system or load resolution. If external control is used (i.e. oil control, other oil sources from the operating system), the Px is controllable; if the internal control is used (i.e., the operation of oil control from the operating system itself), the Px will also be affected by the load pressure. Therefore, the change of the load pressure and the impact of various impact pressure, internal control pressure disturbance is unavoidable. Therefore, the hydraulic machine in the cartridge valve system planning is necessary after careful analysis of accounting, a clear understanding of the whole operation cycle of each branch pressure change situation, pay special attention to analysis of the operation of the conversion process of impact pressure interference, especially internal control method. Attention should be paid to the use of shuttle valves and check valves, otherwise, partial malfunction or paralysis of the whole system will occur.
  2.If the plug valves in several hydraulic machines share an oil return or drain line, a separate oil return or drain line shall be provided to prevent accidental spool movement due to the shock of the pipe pressure.
  3.Pay attention to the area ratio, open pressure, open speed and tightness of the valve operation.
  4.Because the hydraulic machine manufacturer's cartridge valve loop is composed of a separate manipulation of liquid resistance, so their consistency of action can not be as reliable as traditional hydraulic valve. Therefore, the pilot oil circuit should be rationally planned and the technical measures such as shuttle valve or one-way valve shall be adopted to prevent the transient operation of the system and even the paralysis of the system.
  5.The valve block is also called an integrated block or channel block. It is a plug in device, a control cover board and a base body connected with the external pipeline. The valve block is provided with an inserting element, a hole (also called a puncture hole), a main oil passage and a control oil passage hole, and a device is used for controlling the processing plane of the cover plate, the processing plane of the outer pipe of the device and the device plane of the valve block, etc.. The connecting device, connection scale and requirements of the two way hydraulic press shall conform to the national standard (GB2877). Valve block can be used in the hydraulic machine plug-in valve manufacturers standard parts, but also according to the needs of their own planning.

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