Figure 3
Figure 4
Figure 5
Series 91000
••• Self-Operating Regulators
Operation, Installation & Maintenance Manual
Page 12
7.
The Valve and the Actuator may now be separated.
REMOVING Valve Body Assembly
1.
Allow the sensing bulb on the actuator to cool to the bottom of the nominal range.
Artificially cool with ice if necessary.
2.
Record the current actuator adjusting screw setting relative to the reference scale.
3.
Turn the actuator adjusting screw in (up) to reference number 8.
4.
Hold the hexagonal actuator stem with a 5/16” wrench. With a 3/8” wrench, hold the two stem locknuts
as a wrench flat and loosen the valve stem from the hexagonal actuator stem.
DO NOT DIRECTLY GRIP THE ROUND POLISHED PORTION OF THE VALVE STEM.
5.
Remove the Bonnet Nut holding the actuator to the valve with a 1
1
/
2
” wrench.
6.
Unscrew the valve stem from the actuator stem by turning the entire valve body. If the valve body is still
in-line, then unscrew by gently turning the valve stem, gripping it ONLY by the 3/8” hex nuts. Do not directly
grip the round polished portion of the valve stem.
A. Make sure the valve plug is off of the valve seat while turning valve stem to prevent galling of the
seating surfaces.
B. The above instructions will assure a heating valve plug is off of the seat. On a cooling valve it may not
be possible to lower the valve plug off of the seat. If it is not possible to make sure the valve is open,
then while holding the valve stem stationary gently turn the actuator stem to unscrew.
IF MODEL 91600 SEE SPECIAL INSTRUCTIONS FOR MODEL 91600.
VALVE BODY ASSEMBLY
