What is the service valve?
I'm talking about the ball valve, because I don't know exactly what you're talking about. I'll explain it to you literally. I don't know, right?
In front of the valve will need to be all pass, that is, the hole and the ball valve line diameter consistent, the ball will not be card.
I said that the pipeline on the pipeline pigging long-distance, pigging requires this launcher equipment, is the pigging ball into the barrel inside, and then through the process so that the pig into the pipeline, detection of pipeline cleaning or other purposes.
