10
10.
Replace the cross pin.
a)
If the holes are aligned correctly, when holding the valve plug by the valve stem and shaking it like a
rattle, an audible rattle will be both felt and heard.
b)
The cross pin must not protrude form either side of the valve plug.
11.
The valve may now be assembled with the valve plug entering the valve body from the side presenting the
stainless steel seat faces. See Figures 11 & 12. Note that the arrow cast on the side of the body appears to
have been reversed, and (not shown in the picture) the lettering on the other side is now upside down
relative to when you started.
12.
Carefully slide the bonnet over the valve stem and attach to valve body using a suitable thread compound.
13.
Reinstall the packing set. See “Replacing Valve Stem Packing”.
14.
Install the bottom plug using a suitable thread compound.
15.
Replace the locknuts and reassemble the valve to the actuator. See “Replacing the Valve Body Assembly”.
3-WAY REGULATORS-Installation & Maintenance
The Actuators on these regulators are identical to those previously described and the bulb installation is also identical.
These valves require three piping connections and can be used to diverge the flow to either of two outlets, or to
converge two inlets into one outlet. Port C is normally closed and Port B closes as temperature increases. Port A is
the common port and remains open.
Mixing
Inlet pressures must be equal and check valves are recommended in inlets.
Diverting
Outlet pressures must be close to equal to provide consistent pressure differential both ways if partial
flows must be maintained.
NOTE:
The arrow cast on the valve
body always points in the
direction of flow for both
assemblies.
