Welding valve zinc alloy piston buffered sea wind power generation instrument
Wind power generating facility adopting union valve copper alloy flange piston shock absorption
Flanged valve chromium alloy union spring sea wind power generation platform
Tungsten-manganese alloy threaded spring offshore oil well power-assisted system
Offshore well power assisting device with chromium and manganese alloy welding springs
Auxiliary zinc alloy welding piston buffer offshore oil well machinery
Aluminium alloy steel flange piston damping offshore oil well power-assisted equipment
Copper alloy offshore oil well power-assisted device achieving threaded piston shock absorption
Nickel-manganese alloy flange spring offshore oil well power assistance device