... clean leaking proof steel ball fitted at both ends, in case glass pipe broken nominal flage size: DN20, needle valve ... purpose. Leaking proof steel ball fitted at both ends, in case broken of glass pipe.Nominal length: L=300, 500, ... temp)needle valve auto-shut pressure: ≥0.3MPainsulation steam pressure: ≤0.6MPa, connection dimension: M12x1 external threadconnection methord: flange PN1.6 DN20A--Female ...