fruit fly [=pomace fly]
Syrphid-fly or hover-fly
auxiliary valve relief valve setting
bell- shaped valve cup valve
blade control valve relief valve
brake valve relief valve
butterfly valve + non-return intake valve
cooling valve charge relief valve pressure test
cup valve bell shaped valve
cup valve(bell-shaped valve)
dead-weight safety valve (weighted valve)
drum selector valve protection relief valve pressure test
Energy saving on valve plate of hot blast valve
four valve control valve group
lift solenoid valve relief valve