main stop and governing valves
combined emergency stop and governing valve
Intermediate Pressure Main Stop Valve
middle-pressure main stop valve
MSV-BV (main stop valve bypass valve)
branch-boxing with switch network structure of main and auxiliary lines
Connection Section between Horizontal Adit and Main Tunnel
convergent area of main and branch
cross needle and main hook
electromagnetic main-and-collateral-channels cure instrument
high pressure main stop vlave
integrated control for main and auxiliary system
integration of main and backup protection
integration of main and backup protections