There are several ways to maintain the pressure of hydraulic cylinders:

1. Keep pumping. Many equipments have special pressure-maintaining pumps. The pumps are small and the pressure is high. They are kept running during pressure maintenance.

2. Install valves on the oil line. When maintaining pressure, the valves are closed and the sealing leaks are sealed by the valves. Generally, one-way valves, balance valves, and back pressure valves can play this role.

3. It should be noted that any seal or valve cannot be completely sealed without leaking. It is good when it is new, but it cannot be sealed after a period of use. It is better to use a pressure-maintaining pump to supplement the leaks to maintain the pressure.

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