The Role Of 3-piece Threaded Ball Valve Packing

(1) When cutting the packing, use a 45° cut. When installing, stagger the cuts by 180° for each circle.
(2) When using polytetrafluoroethylene molded packing under 3 Piece Threaded Ball Valve, pay attention to its cold flow characteristics.
(3) The flexible graphite ring has a poor sealing effect when used alone. It should be used in combination with flexible graphite braided packing or YS450F (depending on the temperature conditions). The flexible graphite ring is installed in the middle of the stuffing box and the braided packing is installed at both ends. It can also be assembled in layers, that is, one layer of flexible graphite and one layer of braided material. Alternatively, a spacer ring can be placed in the middle of the stuffing box, and the spacer rings can be placed on the upper and lower parts to form two groups of assembled packing.
(4) Graphite corrodes the valve stem and the wall of the stuffing box. When using it, packing with a corrosion inhibitor should be selected.
(5) Flexible graphite is not suitable for media such as aqua regia, concentrated sulfuric acid, and concentrated nitric acid.
(6) The dimensional accuracy, surface roughness of the stuffing box, and the dimensional accuracy and surface roughness of the valve stem are key factors affecting the sealing performance of the molded packing. (7) API 6D standard states in its important information on the use of asbestos or its substitute materials: Because asbestos is associated with certain serious health hazards, some of which are even fatal, such as lung cancer. Therefore, many substitute materials are currently being used and developed to replace the use of asbestos in certain situations.