年表作成・共有サービス - pastport

https://www.shinjovalves.com/products/forged-steel-floating-ball-valves-full-reduced-bore.html

Forged Carbon Steel, Stainless Steel Floating Ball Valves

Ball valve is a kind of quarter-turn valve which utilizes a hollow, perforated and pivoting ball (known as a "ball") to manage flow through it. It's open once the ball's hole is using the flow and closed when the ball valve’s pivoted 90-levels through the valve handle. The handle lies flat in alignment using the flow when open, and it is verticle with respect into it when closed, creating easy visual confirmation from the valve's status.