Azbil VDC - Replacement of Valve Plug and Cage of VDC or VAC Control Valve

Azbil Corporation Parts Replacement
VDC, VAC, VST, VAA - Diaphragm Control Valve 6-3
Figure 6-3 Yarn and “V“PTFE, Combined Packing
6-2 : Replacement of valve plug and Cage of VDC or VAC Control valve.
To replace the valve plug and cage of Model VDC or VAC control valve, follow the
procedure explained in Chapter 4. “Disassembly and Reassembly“.
Whenever possible replace the valve plug and cage as one unit. When replacing
the valve plug and cage as a unit, it is recommended to unite plug & cage prior to
disassembling the valve, so that the replacement work can be nished quickly.
The valve plug and valve stem are also recommended to be replaced in as a pair.
When the valve plug or valve stem alone is required to be replaced, remove the
molded llet from the valve stem end using an electric drill or some other tool, and
disconnect the valve stem from the valve by unscrewing it.
Insert the new stem into the valve plug, weld overall circumference of the valve stem
end, and inspect the straightness of the valve stem. If the trim material is of a special
type, use welding rods of the applicable type.
Figure 6-4 Body and Cage trim