This remote gate valve is on a buried portion of the pipeline. The block controls oil flow by an internal slab, or gate, that is electronically or manually controlled to move up and down, in the open and closed positions respectively., 1976-07, PCA0002-2a-26, Folder: PCA0002-2a. Alyeska Pipeline Service Company : Trans-Alaska Pipeline Construction Collection, 1976-1977, PCA 2. Alaska State Library - Historical Collections Finding Aids. https://alaska.libraryhost.com/repositories/2/archival_objects/17445 Accessed February 22, 2025.