Reasonably selected materials: 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 in 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.
Sealing of the check valve: In the specific working process, due to the large working pressure of the check valve. Therefore, when designing it, in order to avoid the occurrence of sealing problems, it is necessary to reasonably select the material of the sealing surface. When designing, the specific pressure can be designed to be wider. If its working pressure is low, its sealing force will inevitably be small, so in order to ensure sufficient sealing specific pressure, it is necessary to strengthen the reasonable design of the sealing surface. When designing the straight-through check valve, it is generally only installed on the horizontal pipeline, so only one compression spring can be added at this time, mainly relying on the pressure of the working medium to ensure the sealing. In addition, the structural relationship will also affect the sealing of the check valve, so when designing it, the material must be selected reasonably, so as to strengthen the scientific design of the sealing surface. Design scientifically: In the process of designing high-pressure globe valves, check valves, and low-pressure gate valves, in addition to selecting materials reasonably, it is also necessary to analyze the design form, mainly the radial displacement of the valve packing. Controls are selected so that each ring is effectively used in the packing set. When designing the valve, under the action of the pre-tightening force, each single ring must have the same amount of radial deformation, so the designer must ensure the rationality of the valve stem design, so as to avoid the medium to the External penetration, thereby continuously improving the sealing performance of the valve. In the process of installing the valve, in order to prevent the occurrence of problems such as sealing, the convex surface of the graphite packing group is usually made to face the medium, which can not only reasonably control the pressure of the valve during use, but also effectively avoid The occurrence of valve sealing problems. According to the research, it is found that if the internal pressure of the valve is larger, the larger the packing deformation will be generated, and the sealing of the valve will have higher reliability at this time, thereby further improving the quality of the valve.
