Parts Replacement Azbil Corporation
6-4 VDC, VAC, VST, VAA - Diaphragm Control Valve
Figure 6-5 Trim of Split Cage
6-3 : Replacement of valve plug and seat ring of VST, VAA, or VAV
Control Valve
For disassembly and reassembly procedures of the control valve, see Chapter 4. It is
recommended to replace the valve plug and seat ring as a together.
To connect a valve stem to a valve plug, proceed as follows: Fully screw the stem
into the plug. Drill a hole in the plug with an electric drill. Following the guide hole
which is provided on the plug, ream the hole with a 1/50 tapered reamer, and drive a
tapered pin into the hole.
Unite the valve seat at this stage so that the valve plug, gasket (lower) and guide ring
are assembled together.
Figure 6-6 VST Valve Body and Trim
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