(1) Check whether the upper and lower splints of the high-pressure flat gate valve are cracked, welded, corroded, deformed and seriously damaged, whether the valve is flexible, and whether the screw thread of the lock nut is well matched. If there are any defects, replace them.
(2) Clean and check bearings with kerosene. The bearing has no crack, the ball is flexible and complete, and the butterfly fold has no crack. High pressure plate gate valve is deformed.
(3) Clean valve body, valve cover, packing chamber, tile, pressure ring, fixing ring, packing gland, bolt and all parts of high pressure flat gate valve.
(4) Measure the clearance of each part of the high-pressure flat gate valve.
(5) Check the valve material of high pressure plate gate valve, do not misuse. Materials for valve replacement parts shall be tested by metallographic spectroscopy. Valve material shall be approved and recorded by metallographic inspector.
(6) Clean and check the high pressure flat gate valve for sand holes, cracks and corrosion. If there are defects, repair welding can be used.
(7) High pressure plate gate valve sealing surface should be red powder contact test. The contact point should reach 80%. If the contact point is less than 80%, grinding is required. The concave and deep groove of the joint surface shall be welded.
