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A further variation of the threaded joint for oil and gas pipes is described. It creates a metalto-metal seal externally to the female thread. The joint has an extension of the box beyond the seal, which produces an elastic tightening band effect on the seal so that excessive interference on the sea
This patent describes a metal-to-metal seal that is intended to create a high contact stress the seal ring. The flanges each have a triangular section recess. When the flanges are clamped together the seal is forced into the wedge shaped groove creating a high contact stress on the pressure side of
A pressure balance and temperature compensation chamber for the shaft seal on a submersible electric motor is described. A chamber between two shaft seals has a flexible element for temperature compensation. A non-return valve allows fluid to be expelled from the chamber but not enter. A compensatin