Dynamic seal mainly refers to the valve stem seal

Dynamic seal mainly refers to the valve stem seal. Polytetrafluoroethylene braided packing: woven thin PTFE tape into packing, which has excellent corrosion resistance and can be used in cryogenic media. For example, in terms of compression bolts, it can be divided into T-bolts (used for low pressure valves with a pressure of <16 kg/cm²), stud bolts, and joint bolts. 

The packing has the following requirements:  Good airtightness; Corrosion resistance; Small friction coefficient; Suitable for medium temperature and pressure. Commonly used fillers are: Asbestos packing: Asbestos packing has good temperature resistance and corrosion resistance, but when used alone, the sealing effect is not good, so it is always impregnated or added with other materials.It can be divided into round and square. 

Compression nut type This type has small dimensions, but the compression force is limited, and is only used for small valves. The same form can be distinguished in many details. The basic form of stuffing box is: Gland type This is the most used form. Packing In the stuffing box, the packing is in direct contact with the valve stem and fills the stuffing box to prevent leakage of the medium. 

Oil-impregnated asbestos packing: There are two basic structural forms, one is twisted and the other is braided. Schematic diagram of regulating valve packing The following is a reference for network information: Packing is mainly used for dynamic sealing of valves. Preventing the medium in the valve from leaking along with the movement of the valve stem is the central issue of valve dynamic sealing.

The basic functions of the regulating valve packing system: Packing gland: compress the packing to keep the packing in a sealed state; Spring: transfer the force of the gland flange to the packing gland; Packing ring: the packing, which plays a sealing role; Collar ring: divides the packing into two parts, primary seal and secondary seal; Anti-extrusion ring: prevents the packing ring from deforming and affects the sealing performance; Stuffing box ring: plays the role of supporting the packing.  Stuffing box form At present, the valve Gas Stove Top Protectors dynamic sealing is mainly based on the stuffing box. From the gland, it can be divided into integral type and combined type