止回球

• Shipbuilding - bronze 5k screw - down check globe valves union bonnet type
  造船.青铜制5k螺旋拧紧止回球阀
• Shipbuilding - bronze 16k screw - down check globe valves union bonnet type
  造船.青铜制16k螺旋拧紧止回球阀
• Shipbuilding - spheroidal graphite iron ductile iron 10k screw - down check globe valves
  造船.球墨铸铁制10k螺旋拧紧止回球阀