Install bypass hose between VA and TC #4. Open VA, then bleed air by loosening hose connection at TC #4. Tighten hose connection. Close VA.

• 在VA和测试旋塞4号之间安装旁路软管。开启VA，然后松开连接在测试旋塞4号上的软管排放空气。紧固软管连接。关闭VA。