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Maintenance method of large caliber medium frequency pipe be

Maintenance method of large caliber medium frequency pipe bender

When the ball valve, globe valve and gate valve of the large-caliber medium frequency pipe bender are used, they are only fully open or fully closed, regardless of whether they should be used to adjust the flow, so as to avoid the wear of the sealing surface acceleration.There is an inverted sealing device in the gate valve and upper thread globe valve, which can prevent the media from leaking from the packing by turning the hand wheel to the top position and tightening it.Large diameter medium frequency pipe bender should be handwheel, do not use lever or other tools, so as not to damage the valve parts.Clockwise rotation of the handwheel is closed and vice versa.The bolts of the packing gland of the large caliber intermediate frequency bend pipe should be tightened evenly, and should not be pressed into a crooked state to avoid collision, hindering stem movement or causing leakage.Long - term storage of large caliber intermediate frequency elbow should be checked regularly, often keep the exposed processing surface clean, neatly stored in the room in a ventilated and dry place, it is forbidden to stack or open storage.

When the bending center Angle of the intermediate frequency pipe bender is large, the straight line of the tail of the pipe fittings continues to be pulled through the tangent point B and the bending deformation, due to the restriction of the fiber, the deformation degree of the straight line segment near the tangent point B increases, the formed pipe fittings are unloaded, and the deformation area moves back from the front end of the pipe.Therefore, the increase of external load consumed on the bending deformation of the pipe will not be as significant as when the bending center Angle is small.

The bending Angle at centre continues to increase, however, has formed the strain hardening effect makes the stress changes in not less than the existing level (or pipe fittings will occur elastic recovery), and to prevent the bending pipe fittings in elastic recovery, briquetting exert more pressure on pipe fittings, pipe inside wall thickness increase at the same time reduce the clearance between the mandrel and tube,It is more difficult to move the straight section of pipe fitting, which increases the resistance of bending and rotation of pipe fitting.In addition, the head of the cylinder mandre can not be bent, and the supporting effect on the curved section is more limited. The combined effect of these factors will make the external load on the section of the pipe continue to increase, even if the degree is still further increased.

1498-1492.