Key points for maintenance and upkeep of marine valves

The maintenance of marine valves is crucial for ensuring the safe operation of ships. Here are some key maintenance points,
1. Storage and Preservation
Environmental conditions: Valves should be stored in a dry and ventilated place to avoid direct exposure to humid or corrosive environments.
Placement method: Small valves should be placed on shelves, while large valves can be neatly arranged on the ground, but it is important to ensure that the flange connection surface does not touch the ground to prevent damage.
Protective measures: Valves that are not used in the short term should have asbestos packing removed and protected with anti-corrosion materials such as Dyline anti rust wax to seal the inlet and outlet to prevent dirt from entering.
2. Regular inspections
Sealing surface inspection: Regularly check whether the sealing surface of the valve is worn, and repair or replace it if necessary.
Thread and nut inspection: Check the trapezoidal thread wear of the valve stem and valve stem nut, as well as whether the packing has expired or failed, and replace damaged parts in a timely manner.
Leak detection: Check for leaks in the packing gland, oil filling hole, and relief ball valve to ensure no leaks or rust.
3. Lubrication and grease injection
Fat injection control: Accurately calculate the grease injection amount based on the valve type and sealing capacity to avoid insufficient or excessive grease injection.
Injection pressure: Pay attention to the pressure changes during injection to ensure that the pressure is moderate, neither too low nor too high.
Lubricating state: Select the appropriate switch state according to the valve type for grease injection. For example, ball valves usually inject grease in the fully open state, while gate valves inject grease in the fully closed state.
4. Operation and use
Manual device inspection: Regularly check the manual device of the valve to ensure smooth and normal opening and closing.
Sewage treatment: Open the sewage outlet, clean the dirt inside the valve body, and keep the interior clean.
Limit adjustment: Adjust the opening and closing limiters of the valve to ensure the right angle travel of the valve.
5. Maintenance of special parts
Pressure relief hole maintenance: For valves with pressure relief holes (such as low-temperature shut-off valves), it is necessary to regularly check whether the pressure relief holes are blocked, whether the sealing performance is good, and whether the exhaust effect is normal.
Electric head maintenance: Pay attention to the waterproof issues of the electric head and its transmission mechanism to prevent rusting or freezing, which may affect electric operation.
6. Safety precautions
Personal protection: Operators should be familiar with the correct wearing and use of personal safety protective equipment to ensure personal safety during work.
Tool preparation: Prepare a complete set of valve specific grease injection tools, cleaning supplies, and other commonly used tools to ensure the smooth progress of maintenance work.
Through the above maintenance points, the service life of marine valves can be effectively extended, ensuring their reliability and safety under various working conditions.