[freeze]

hello
i have a question about boundary
in my case, i need to make a valve that can open and close, when open it, fluid will go into model, when close, block fluid, like this video https://youtu.be/CqWUAk3okko

i find some videos want to learning
https://youtu.be/ei6-k1pysyQ and https://youtu.be/9-Tu-Koy-D8?t=3m57s

but the videos have not to show how to mesh, some mesh method i don't know how to do, like name local mesh.

attachment is my model and two result, one is valve wall attached another wall, fluid can't pass through, another result is when valve closed, fluid still leak out.

anyone can help me to resolve this boundary problem?
tkanks