with thread sealing pipe thread

With thread sealing pipe thread without packing or seal quality can prevent leakage. Sealed with a screw thread having  Hydraulic ferrules inner pipe threads and taper external thread, taper thread and taper external thread forms two connections . Pressure below 5 × 105Pa , with the former connection is tight enough , the latter connection is usually only used under high temperature and high pressure . 2, with thread sealing pipe thread Female thread has tapered and cylindrical forms. Only one form of conical external thread . Tooth type is as follows: taper 1:16 , tooth -shaped angle 55 °, the old thread standard example : ZG3 / 8;