Marine oil cylinders are an important part of the ship's hydraulic system and are widely used in steering gears, cranes, hatches and other regulating equipment. The oil cylinder generates power through the action of hydraulic oil to realize various mechanical movements of ship equipment. When the oil cylinder pressure is insufficient, it may cause the equipment to fail to work properly, and in severe cases, it may even cause the failure of ship operation or damage to the equipment. Therefore, analyzing the reasons for insufficient oil cylinder pressure and taking corresponding treatment measures are crucial to ensure the safety and normal operation of the ship.

1. Common causes of insufficient pressure in marine oil cylinders
Insufficient or leaking hydraulic oil level
Cause analysis: Insufficient oil in the hydraulic system is one of the common causes of insufficient pressure. If the oil level is too low, the hydraulic pump cannot absorb enough hydraulic oil, resulting in insufficient oil supply, so that the system cannot generate enough pressure. In addition, leaks in the system will also cause oil loss, resulting in insufficient pressure.
Solution:
Check the hydraulic oil level regularly to ensure that the level is within the normal range. Refill in time when the oil is insufficient.
Check whether there are leaks in the pipes, joints, valves, etc. in the hydraulic system, and repair the leaks in time.
Hydraulic pump failure or reduced efficiency
Cause analysis: The hydraulic pump is the core component of the hydraulic system and is responsible for providing the pressure and flow required by the system. If the hydraulic pump fails, such as damage, wear or air inhalation, the cylinder will not be able to obtain sufficient pressure. In addition, the reduced efficiency of the hydraulic pump may also lead to insufficient pressure.
Solution:
Engineering cylinder manufacturers regularly check the operating status of the hydraulic pump, including flow and pressure output. If the performance of the pump is found to be degraded, it should be repaired or replaced in time.
Check the suction port of the hydraulic pump to ensure that no air or impurities are inhaled to affect the normal operation of the pump.
Hydraulic oil contamination
Cause analysis: Contaminants in the hydraulic oil (such as moisture, dust, impurities, etc.) will cause abnormal oil viscosity, affect the normal operation of the system, and then cause insufficient pressure. Contaminants will increase the wear in the system, reduce the working efficiency of the pump and valve, and even cause damage to the seals, further exacerbating the problems of oil leakage and insufficient pressure.
Solution:
Replace the hydraulic oil regularly to ensure that the oil is clean and meets the system requirements. Install a filter device to prevent contaminants from entering the hydraulic system.
Monitor the quality of the oil and regularly check the acid value, moisture content and impurity level of the oil to ensure that the oil is within the specified range.

Failure of pressure regulating valve or relief valve
Cause analysis: The pressure regulating valve and relief valve in the hydraulic system are key components for controlling system pressure. If these valves fail, such as valve core stuck, worn or malfunction, the system will not be able to maintain the designed working pressure, which will cause insufficient pressure.
Solution:
Regularly check the working status of the pressure regulating valve and relief valve to ensure that the valve can properly adjust and control the system pressure.
Engineering cylinder manufacturers clean the valves and check whether the valve core is stuck or worn, and repair or replace them if necessary.
Internal leakage in the hydraulic system
Cause analysis: Internal leakage of any component in the system (such as damaged seals, loose pipe joints, etc.) will cause the loss of hydraulic oil, which will affect the pressure of the system. Common leakage points include seals, control valves, pipe joints and other parts of the cylinder.
Solution:
Check all seals in the cylinder and system to ensure good sealing. If damaged, replace the seals in time.
Check the tightness of the hydraulic pipes and joints to ensure that there is no looseness and leakage. Repair or replace if necessary.
Air enters the system
Cause analysis: If air enters the hydraulic system, it may increase the compressibility of the hydraulic oil, affect the fluidity and pressure output of the system, and cause insufficient pressure. Air entry may be caused by poor exhaust or loose sealing of the system.
Solution:
Exhaust the air in the system and use the exhaust valve to exhaust the bubbles. Make sure that the hydraulic system is completely exhausted when working.
Hydraulic cylinder manufacturers check whether the seals are intact to ensure that the oil will not leak or inhale air.
Cylinder piston is stuck or the resistance is too large
Cause analysis: If there is a stuck phenomenon inside the cylinder, or the friction between the piston rod and the cylinder wall is too large, the oil will not flow smoothly, and excessive resistance will be generated, which will cause the system to fail to reach sufficient pressure and the cylinder will not work normally.
Solution:
Check the inside of the cylinder regularly to ensure that there is no damage, scratches or stuck on the piston rod and cylinder surface. If problems are found, clean or repair them in time.
Use appropriate lubricating oil to reduce friction and ensure smooth operation of the cylinder.
Improper design of hydraulic system
Cause analysis: If the design of the hydraulic system does not meet the working requirements, such as the pipeline is too long, the resistance is too large, or the system pressure setting is unreasonable, it may also lead to insufficient pressure.
Solution:
Review the hydraulic system design to ensure that the design is reasonable, the pipeline length and specifications are appropriate, and the pressure setting meets the actual use requirements.
If necessary, optimize the system to reduce unnecessary pressure loss.

2. How to solve the problem of insufficient pressure in marine cylinders
Regularly maintain the hydraulic system
Regularly check and replace hydraulic oil, seals, filters, etc. to ensure that all components of the system are in good condition. Timely handle the failure of key components such as cylinders, pumps, and valves to prevent the occurrence of insufficient pressure problems.
Optimize the hydraulic system
Optimize the design of the hydraulic system according to actual use, ensure that the hydraulic pump, pipeline, valve and other components are reasonably configured, reduce unnecessary losses, and improve the work efficiency of the system.
Timely remove system air
Use effective exhaust measures to ensure that the air in the hydraulic system is removed in time to avoid affecting the pressure output.
Detect and repair leaks
Carry out multiple inspections of the system, find leaks and repair them in time to avoid insufficient pressure caused by oil loss.
Adjust system pressure
Regularly check and adjust the pressure of the hydraulic system to ensure that it is within the normal range. If the pressure is found to be too high or too low, it should be adjusted according to the actual situation.

3. Summary
Insufficient pressure in the marine cylinder is one of the common and important faults in the hydraulic system that affects the performance of the equipment. The reasons may include insufficient hydraulic oil, hydraulic pump failure, system contamination, leakage, valve failure and other aspects. In order to avoid the problem of insufficient pressure, the hydraulic system should be regularly inspected and maintained to ensure the normal operation of each component, troubleshoot in time, and ensure the safe operation of the ship's hydraulic system. Through reasonable design, optimization and maintenance, the occurrence of insufficient cylinder pressure can be effectively prevented and the normal operation of the ship can be guaranteed.