Hi mhmaur, and welcome! I see you are a new member here, having joined earlier this morning. We are glad to see you are already engaging with the community through this one of your first two posts.
As it turns out, you are not alone! We have a wealth of material published, right here on COPD.net, which focuses on the endobronchial valve procedure. (The Zephyr valve is one brand name that may be used). For your convenience, here is a link to several of those articles: https://copd.net/search?s=Endobronchial%20valve%20zephyr%20valve. I do hope you find the information is helpful for you in a practical way.
Are you being considered for this procedure?
All the best,
Leon (site moderator COPD.net)