Repair method for fluorine lined DC globe valve when various clearances of parts exceed the tolerance

Fluorine lined valve factory Three pairs of friction pair inspection and repair: According to the replacement standards of plunger pump parts, when various clearances of the parts exceed the tolerance, the plunger rod and cylinder body hole can be repaired according to the following methods:

(1) If the cylinder body is fitted with a copper sleeve, it can be repaired by replacing the copper sleeve. First, place a set of columns check valve Adjust the diameter of the plug rod to a uniform size, and then polish the outer diameter with sandpaper of 1000 # or above. There are three methods for installing copper sleeves on cylinder bodies: (a) cylinder body heating and hot installation or copper sleeve low-temperature freezing and extrusion, interference fit assembly; (b) Assemble with Loctite adhesive, which requires grooves on the outer diameter surface of the copper jacket; (c) Tap the cylinder hole, thread the outer diameter of the copper sleeve, apply Loctite adhesive, and screw it into the assembly.

(2) The repair method for the cylinder body and copper sleeve of the fusion bonding method is as follows: (a) using a grinding rod, manually or mechanically grinding and repairing the cylinder hole; (b) Use a coordinate boring machine to re bore the cylinder body hole; (c) Use a reamer to repair the cylinder bore.

(3) Using "surface engineering technology", the method is as follows: (a) electroplating technology: plating a layer of hard chromium on the surface of the plunger; (b) Electric brush plating technology: Brush plating wear-resistant materials on the surface of the plunger; (c) Thermal spraying, arc spraying, or electric spraying: spraying high carbon martensitic wear-resistant materials; (d) Laser cladding: depositing high hardness and wear-resistant alloy powder on the surface of the plunger.

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