Control valve made of PTFE packing rings shape

Filler system structure is determined, there are a variety of factors affect the performance of the system sealing and friction, life, e.g., improper installation, the stem processing finish, the finish machining of the packing chamber, the mass of filler.solenoid valve actuator
In order to not be leaked in some occasions, the bellows seal can be used, for example, the use of bellows seal on the valve
Cover applications in the nuclear industry, packing and bellows double sealing system to ensure that the system does not leak.
The rotary control valves filler system is similar to the above for straight trip control valve packing system. Changes in the structure of the valve cover assembly on the packing chamber in the position of the valve body has changed, but the basic structure is the same.
In packing structure design and application should be aware of the following.
1. The different stuffing box and packing structure suitable for different applications. Rational use of the stuffing box and packing structure can achieve the required sealed condition to reduce friction and prolong life.
Packed structure, the filler layers and the length is not better, usually packed length is 1,5 times the stem diameter.
(3) improve the processing of the stem and packing chamber finish and surface accuracy is very important, PTFE packing, valve stem or packing chamber finish enough to make the seal decline, resulting in leakage increases.
4 packing structure design should be able to automatically adjust the pressing force to compensate for wear and tear caused the decline of the pressing force, should be conducive to on-site maintenance and installation.
Improper installation of the control valve will cause uneven friction, such as horizontal mounting stem dead weight the filler pressure on the lower horizontal line, increase the friction, and the horizontal upper packing sealing performance deterioration due to the pressing force is reduced leaving.3 way air valve