However, the axial sealingforce is not the bigger the better.
然而，轴向密封力并非越大越好。
2
Valve seat (ring) generally use the Teflon and other flexible materials, easy-to ensure the seal, and valve sealingforce with medium pressure increases.
A perforated plate (supporting shell) is placed between upper and lower sealing rim to reinforce the pleated material against deformations (sealingforce).