The sealing principle of the ferrule type pipe joint of cold drawn pipe?
Aug 16, 2021
The main sealing part of this joint is the ferrule. With the tightening of the nut, the ferrule rubber ring moves axially along the inner taper hole of the connector body under the action of the axial force of the nut. The conical surface is attached to the conical surface of the connector body, and the end surface of the rubber ring is attached to the end surface of the connector body at the same time.
When the functional nut continues to be tightened, the front end of the metal ferrule contacts the inner cone surface of the rubber ring and produces a reverse force on the metal ferrule. The blade end of the ferrule shrinks radially under the radial action of the reaction force. Gradually eliminate the gap between the ferrule and the pipe, and make the blade contact the surface of the pipe, and continue to rotate the nut. The outer cone of the rubber ring fits tightly with the inner cone of the joint. Due to the compression, the tapered part of the rubber ring is tightly connected to the pipe. Fitting to achieve sealing, while the cutting edge of the ferrule is also firmly cut into the tube to ensure a reliable seal.
The tail cone of the ferrule shrinks radially under the action of the force, tightly hugs the connected pipe, while the middle part is slightly arched, so the ferrule has axial elastic deformation, which can seal the ferrule and prevent the compression nut from loosening. Favorable effect.
