Lubrication parts should be regularly oiled according to specific conditions. Frequently opened valves with high temperature are suitable for refueling once a week to a month; valves with infrequent openings and low temperature may have a longer refueling cycle. Lubricants: organic oil, butter, molybdenum disulfide and graphite, etc. High-temperature valves are not suitable for using engine oil and butter, which will be lost due to high temperature melting. They are suitable for injecting molybdenum disulfide and wiping graphite powder. For exposed parts that need to be lubricated, such as trapezoidal threads, gears, etc., if grease such as butter is used, it is easy to be contaminated with dust, while molybdenum disulfide and graphite powder are used for lubrication, and the lubrication effect is better than that of butter. Graphite powder is not easy to apply directly, it can be used in paste form with a little oil or water.
The oil-filled plug valve should be filled with oil according to the specified time, otherwise it is easy to wear and leak.
For valves in operation, various valve parts should be complete and intact. The bolts on the flange and the bracket are indispensable, and the threads should be intact and no looseness is allowed. The fastening nut on the handwheel should be tightened in time if it is found to be loose to avoid wearing the connection or losing the handwheel and nameplate. If the handwheel is lost, it is not allowed to replace it with an adjustable wrench, and it should be equipped in time. The packing gland is not allowed to be skewed or without pre-tightening clearance. For valves in an environment that is easily contaminated by rain, snow, dust, sand and other dirt, the valve stem should be equipped with a protective cover. The ruler on the valve should be complete, accurate and clear. The lead seals, caps and pneumatic accessories of the valve should be complete and intact. The insulation jacket should be free of dents and cracks.
It is not allowed to knock, stand or support heavy objects on the valve in operation; especially non-metal valves and cast iron valves, it is even more forbidden
Maintenance of idle valves
Maintenance of idle valves should be carried out together with equipment and pipelines, and the following work should be done:
1. Clean the valve
The inner cavity of the valve should be purged and cleaned without any residue or water solution. The outside of the valve should be wiped clean without any dirt, oil,
2. Complete valve parts
After the valve is missing parts, it cannot be dismantled and repaired. The valve parts should be equipped to create good conditions for the next use and ensure that the valve is in good condition.
3. Anti-corrosion treatment
Take out the packing in the stuffing box to prevent electrochemical corrosion of the valve stem, and apply anti-rust agent and grease to the valve sealing surface, valve stem, valve stem nut, machined surface and other parts according to the specific conditions; the painted parts should be painted with anti-corrosion Rust paint.
4. Protection and protection
Prevent the impact of other objects, man-made manipulation and disassembly, if necessary, the movable parts of the valve should be fixed, and the valve should be packaged and protected.
Valves that have been idle for a long time should be inspected and maintained regularly to prevent corrosion and damage to the valve. For valves that have been idle for too long, they should be tested together with equipment, devices, and pipelines before they can be used.