Badger Meter Research Control Valve - Manual (Page 8)

Remove gland and blow or pick out any small pieces
that may be in the threads. (Fig. 13) Replace gland finger
tight and remove dummy stem Figure 14 and replace
with new innervalve and stem. Tighten packing gland
and test seal at final assembly the same as with chevron
ring packing. 2. Graphoil Packing
Depending on the application, graphoil packing is
available in preformed rings to fit standard packing
cavities for all Research Control Valves. When a process
must run hot to prevent material from solidifying or for
other purposes where finned bonnets are used to
dissipate heat to protect the packing are not applicable,
graphoil may be the solution. If the application is quick
opening (on-off) and graphoil packing is used, the
standard actuator will work with higher operating pressure.
If application is to control, a positioner should be used
to overcome additional drag, or hysteresis, created by
graphoil making stem seal, especially on high pressure
gases.
FIG. 12
FIG. 14
FIG. 13
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