- Newton teach you how to remove part of the global valve
-
Newton offers a special weld removal
tool. The tool fits onto the bonnet of the valve
and is free to rotate on the stem. The tool
holds a grinder in place. The operator is then
able to reduce the distance between the
grinder and valve shoulder until the weld has
been completely eliminated. The advantages
of this tool are its ease of use and its
precision, which reduces the likelihood that
the valve will be damaged during welding. If
the tool is not available, the weld can be
removed using a standard 90º grinder.
A. Follow steps in general maintenance manual up to point where bonnet has been separated from body. In case of y-pattern, remove all top works, open the valve partially. Grind-off bonnet seal weld. NOTE: Velan can offer special seal weld cutting tool. After the weld has been removed, unscrew the bonnet counter clockwise and remove complete belows seal assembly through top of yoke opening. The valve is now ready for parts replacement and/or repairs. Make sure to follow safety warnings in section 3 of given manual.
B. Valve seat is now ready for inspection. NOTE: Only disassemble valve further if advised to by Newton offers a special weld removal tool. The tool fits onto the bonnet of the valve and is free to rotate on the stem. The tool holds a grinder in place. The operator is then able to reduce the distance between the grinder and valve shoulder until the weld has been completely eliminated. The advantages of this tool are its ease of use and its precision, which reduces the likelihood that the valve will be damaged during welding. If the tool is not available, the weld can be removed using a standard 90º grinder.
C. Remove Disc
i. High Pressure Disc
1. The connection between the stem and the disc is made by the use of a disc union and the stem collar or disc coupling. To remove this connection, break the tack welds using a saw or a small chisel.
2. Unscrew the disc union from the disc and pull the disc off the stem.
ii. Low Pressure Disc
1. The connection between the stem and the disc is made by the use of a stem-disc pin. The pin goes through the stem and disc and is locked in place by the disc hole being peened on both ends.
2. Remove the stem disc pin by removing the peening on one side of the disc..
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