Valve sealing is one of the main contents in the working process of the valve. Its main function is to avoid leakage and other problems, and it will be in direct contact with the medium of the pipeline. In the process of using the valve, in order to improve its quality, technicians strengthen the control of materials and analyze different media in the pipeline. When applying the preload force to the packing group, the technician must control the direction of the bearing pressure at both ends of the packing. If the valve does not have sufficient wear when it is moving, in order to prevent the occurrence of sealing problems, technicians can use the packing group to control it reasonably to provide the safe use of high-pressure globe valves, check valves and low-pressure gate valves. Base. According to the research, generally only one-third of the packing shaft surface will generate an N-shaped preload, so at this time, in order to improve the sealing performance of high-pressure globe valves, check valves, and low-pressure gate valves, designers must combine In the actual situation, in the traditional design of packing seal, the principle of radial extension and deformation is reasonably used to control the axial pressure, which can effectively shrink and hold the outer wall of the valve stem to a certain extent, and continuously improve the quality of the design. In addition, after designing and producing high-pressure globe valves, low-pressure gate valves, etc., the designer should also reasonably choose the density of the combined packing, because it will have a certain impact on the size of the axial pressure, so the technicians should The actual production situation of high pressure globe valve and low pressure gate valve reasonably controls the density of combined packing.
