| 摘要 |
A flow control device having a control member for forming a seal with another part of the flow control device. The control member having a base material and a portion or surface that is a softer or more deformable than the base material or the portion of the control device that the control member forms a seal with. The differences in hardness and/or the ability of the control member portion to deform, aids in forming the seal.
|
