Sullair Thermo Valve Repair Kit Replacement – 02250112-709

Sullair 02250112-709 – Thermo Valve Repair Kit

The Sullair 02250112-709 Thermo Valve Repair Kit is a service kit used for maintaining the thermal/thermostatic valve in Sullair rotary screw air compressors. The thermal valve regulates the temperature of compressor oil by controlling whether the oil flows through the oil cooler or bypasses it.

Working Process:

During compressor start-up, the compressor oil is relatively cool. The thermal valve initially keeps the oil cooler partially or completely bypassed. This allows the lubricant to warm up quickly and helps the compressor reach its normal operating temperature without unnecessary cooling.

As the compressor operates, the oil absorbs heat generated during the compression process. When the oil temperature approaches the thermal valve’s operating range, the thermostatic element begins to move.

For the 02250112-709, references identify the kit as a 190°F thermo-valve repair kit. At approximately this temperature range, the thermal element progressively changes the valve position and directs an increasing amount of oil through the oil cooler.

The oil passing through the cooler releases heat to the surrounding air. The cooled oil then returns to the compressor air end, where it performs its essential functions of lubrication, cooling, sealing, and heat removal.

As the oil temperature changes during operation, the thermostatic element automatically adjusts the flow path. This provides continuous temperature regulation without requiring manual adjustment.

Maintaining the correct oil temperature is critical for a rotary screw compressor. If the oil becomes too hot, lubricant degradation, increased viscosity changes, excessive oil carryover, and component wear may occur. If the oil remains too cold, moisture condensation and poor lubrication conditions can develop.

The 02250112-709 repair kit is designed to restore the sealing and temperature-control performance of the thermal valve when its internal wear components become damaged, worn, contaminated, or unable to respond correctly to temperature changes. Sullair parts references identify the part as “KIT, THERMO VALVE RPR V-CUP 190F.”

During maintenance, the compressor should be stopped, isolated, depressurized, and allowed to cool before the thermal valve is opened. The existing valve element, seals, V-cup and associated components should be removed and inspected.

The valve body and oil passages should be cleaned and checked for contamination, scoring, corrosion, or damage. The replacement components supplied in the 02250112-709 kit should then be installed according to the applicable Sullair service procedure.

Correct installation of the thermostatic element and sealing components is important because an incorrectly assembled valve can cause incorrect oil temperature regulation or oil leakage.

After servicing, the compressor should be started and allowed to reach normal operating temperature. Oil temperature should be monitored to verify that the thermal valve correctly changes the oil-flow path as temperature increases.

A faulty thermal valve can cause excessive oil temperature, slow warm-up, poor cooling, oil degradation, increased oil consumption, or compressor overheating.

Correct maintenance using the Sullair 02250112-709 Thermo Valve Repair Kit helps restore automatic oil-temperature regulation, maintain proper lubrication and cooling, protect the compressor air end, and improve compressor reliability.

Part Number: 02250112-709
Numeric Format: 02250112709
Brand: Sullair
Part Description: Kit, Thermo Valve Repair V-Cup 190F
Component Type: Thermostatic / thermal valve repair kit
Application: Sullair rotary screw air compressors
Operating Temperature Reference: 190°F
Primary Function: Controls compressor oil temperature by regulating oil flow through the oil cooler
Operating Function: Automatically changes oil-flow path according to oil temperature
Main Benefits: Proper oil-temperature control, improved lubrication, effective cooling, reduced thermal stress, and reliable compressor operation.

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