How should breathing valves be generally maintained

Maintenance and maintenance of the breathing valve should be done once a month, twice a month in winter. The method is: first gently open the valve cover, take out the vacuum valve disc and pressure valve disc, check the valve disc and valve disc seal, valve disc guide rod and guide rod sleeve for oil and dirt. If there is oil and dirt, The dirt should be cleared away, then put back into the original position, pull it up and down a few times, and check whether the opening is flexible and reliable. If everything is normal, cover the valve cover and tighten it. Note that during maintenance and upkeep, if the valve disc is found to have scratches, wear and other abnormalities, it must be replaced immediately or contact the supplier for timely resolution.