... . C,in-line field maintenance. ITHE STRUCTURE OF THE TWIN SEAL GUIDE WAY VALVE.Characteristic:A, no leakage, wonderful seal property.B ... wedging action of the plug and 90.Rotation, the twin seal guide way valve can be opened and closed freely. When the ... pressure relief methods:1. Manual body bleed systemAfter the twin seal guide way valve is closed, you can open a simply relief ...