R-Pro › Field cases › Refrigeration systems

Valve Partial Failure Causing Re-compression and Oil Overheating

Likely causes

Suction valve failure causing hot gas back-flow

Check: Pump down and observe suction pressure rise (rising = valve fault)

What to do: Pump down and observe suction pressure rise (rising = valve fault) → Measure discharge line temperature (abnormally high = valve suspect) → Replace compressor or valve plate (reciprocating compressor) → High recurrence risk if root cause (liquid slugging) is not addressed

Discharge valve failure causing re-compression

Check: Measure discharge line temperature (abnormally high = valve suspect)

What to do: Measure discharge line temperature (abnormally high = valve suspect) → Replace compressor or valve plate (reciprocating compressor) → High recurrence risk if root cause (liquid slugging) is not addressed

Valve deformation from liquid slugging

Check: Replace compressor or valve plate (reciprocating compressor)

What to do: Replace compressor or valve plate (reciprocating compressor) → High recurrence risk if root cause (liquid slugging) is not addressed

Field tip

Partial valve failure causes re-compression and oil overheating. Compressor inspection or replacement needed. Carbonized oil from overheating causes secondary failures (capillary or TXV blockage). Full oil replacement recommended.

All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.

Open R-Pro →

Related cases