The maintenance of the valve can be divided into two situations; one is custody maintenance, and the other is the use of maintenance. (A) Custody Maintenance The purpose of custody maintenance is not to damage the valve in custody, or to reduce the quality. In fact, improper storage is one of the important reasons for valve damage. Valve storage, should be well-organized, small valves on the shelves, large valves can be arranged neatly in the warehouse floor, can not be messy stack, do not let the flange contact surface contact with the ground. This is not only beautiful, mainly to protect the valve will not be damaged. Due to improper storage and handling, broken handwheel, crooked stem, nut looseness of the handwheel and stem, etc., these unnecessary losses should be avoided. Short-term temporary use of the valve should be removed asbestos packing, so as to avoid electrochemical corrosion, damage to the stem. On the just entering the valve, to be checked, such as in the process of entering the rain or dirt, to wipe clean, and then stored. Import and export of valves to use wax paper or plastic sheet sealed to prevent the dirty things. To rust in the air valve surface to be coated with anti-rust oil, to be protected. Place the outdoor valve must be covered with linoleum or tarpaulins like rain, dust-proof items. Store the valve warehouse to be clean and dry. (B) the use of maintenance The use of maintenance purposes, is to extend the life of the valve and ensure the opening and closing reliable. Stem thread, often with the stem nut friction, to be coated with a little yellow dry oil, molybdenum disulfide or graphite powder, play a role in lubrication. Do not often open and close the valve, but also on a regular basis to turn the hand wheel, add thread lubricant on the stem to prevent biting. Outdoor valves, to the stem plus protective sleeve to prevent rain, snow, dust rust. If the valve system to be moving, to be on time to add gearbox lubrication. Always keep the valve clean. Always check and maintain the integrity of the valve parts. If the handwheel fixed nut off, to be equipped, can not make improper use, otherwise the upper part of the stem will be parked square, with the gradual loss of reliability, and can not even start. Do not rely on the valve to support other heavy objects, do not stand on the valve. Stem, especially the threaded part, to be wiped often, to be contaminated with dust to be replaced with new lubricant, because the dust contains hard debris, easy to wear threads and stem surface, affecting the service life.
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