Maintenance of high pressure flat gate valve
(1) Check whether there are cracks, welding, corrosion, deformation and serious damage on the upper and lower clamping plates of the high-pressure flat gate valve, whether the valve adjustment is flexible, and whether the thread of the locking nut fits well. If there is any defect, please replace it.
(2) Clean and inspect bearings with kerosene. The bearing has no crack, the ball is flexible and complete, and the butterfly fold has no crack. The high pressure flat gate valve is deformed.
(3) Clean all parts of the valve body, bonnet, packing chamber, Bush, pressure ring, retaining ring, packing gland, bolts and high pressure flat gate valve.
(4) Measure the clearance of each part of high pressure flat gate valve.
(5) Check the valve material of high pressure flat gate valve, and do not misuse it. The material of valve replacement parts shall be tested by metallographic spectrum. Valve material shall be approved and recorded by metallographic inspector.
(6) Clean and inspect the high pressure flat gate valve for sand holes, cracks and corrosion. In case of defects, repair welding can be used.
(7) The sealing surface of high pressure flat gate valve shall be tested with red lead powder. The contact point should reach 80%. If the contact point is less than 80%, grinding is required. The concave surface and deep groove of the joint surface shall be welded.