Refrigeration Service Operations (Rev. 04/03)
86
THROTTLING VALVE
Removal
1. Pump down the low side and equalize pressure to
slightly positive.
2. Front seat the discharge and suction service valves.
Release remaining pressure.
3. Remove the suction valve and line from compound
gauge.
4. Unbolt and remove the throttling valve from the unit.
Repair
DISASSEMBLY
1. Remove the piston end cap (round end).
2. Remove the cotter pin from the castle nut and remove
the nut.
3. Remove the spring and piston.
4. Loosen all the bolts on bellows end cap.
CAUTION: This end cap is under slight spring pres-
sure.
5. Break the gasket free and remove the end cap.
6. Note the number of shims next to the cap. These can be
reused.
7. Remove bellows (discard).
8. Inspect all the parts (replace if excess wear is found).
a. Piston and cap for wear (scuff marks)
b. Body for stripped threads
c. Bellows end cap for damage in pilot hole
NOTE: Bellows is normally replaced.
9. Clean the parts to be reused.
To Next Page