Kaeser Bypass Valve Maintenance K Replacement – 222958E1

Kaeser 222958E1 – Bypass Valve Maintenance Kit

The Kaeser 222958E1 Bypass Valve Maintenance Kit is a service kit used to maintain the bypass/overpressure control valve within the compressor’s oil and temperature-management circuit. The valve regulates the flow of compressor oil through the appropriate cooling path according to operating temperature and pressure conditions.

Working Process:

During compressor operation, lubricating oil circulates through the compressor element and absorbs heat generated during air compression. The heated oil is then directed through the oil-cooling circuit so that its temperature can be controlled before the oil returns to the compressor element.

The bypass valve controls whether oil flows through the oil cooler or bypasses it. When the compressor oil is relatively cold, the thermostatic bypass mechanism restricts or bypasses the oil cooler. This allows the oil to reach the required operating temperature more quickly and prevents excessive cooling during start-up.

As the oil temperature rises toward the valve’s operating range, the bypass mechanism progressively changes position. A greater proportion of the oil is directed through the oil cooler, where heat is transferred away from the lubricant.

During normal operation, the valve continuously responds to oil temperature and maintains an appropriate oil-flow path. This helps keep the compressor lubricant within its required operating-temperature range.

Maintaining the correct oil temperature is important because compressor oil performs several functions: it lubricates moving components, removes heat from the compression element, and assists with sealing between the screw rotors. Excessively cold or excessively hot oil can negatively affect compressor performance and component life.

The 222958E1 maintenance kit is used to restore the operating and sealing performance of the bypass valve when its internal components become worn, contaminated, or damaged. Kaeser parts references identify 222958E1 specifically as a Maintenance Kit Bypass Valve.

During maintenance, the compressor should be stopped, isolated, depressurized, and allowed to cool before the valve is serviced. The bypass-valve assembly is opened and the internal service components are inspected for wear, contamination, damaged sealing surfaces, and restricted movement.

The components supplied in the maintenance kit are installed in the correct positions according to the applicable Kaeser service procedure. Proper assembly is important because incorrect installation can affect oil-flow regulation and compressor temperature control.

After servicing, the compressor should be operated through its normal start-up and loaded operating cycle. Oil temperature and valve operation should be monitored to confirm that the bypass circuit changes correctly as the compressor warms up.

A worn or malfunctioning bypass valve can cause excessive oil temperature, slow warm-up, poor oil cooling, unstable operating temperature, increased oil degradation, or reduced compressor efficiency.

Correct maintenance of the 222958E1 Bypass Valve Maintenance Kit helps maintain proper oil-temperature regulation, protect the compressor element, improve lubrication conditions, reduce thermal stress, and support reliable compressor operation.

Part Number: 222958E1
Brand: Kaeser
Part Description: Maintenance Kit – Bypass Valve
Component Type: Bypass / oil-temperature control valve service kit
Typical Application: Kaeser rotary screw compressors
Known Models: ASD, BSD, CSD series
Primary Function: Regulates oil flow through or around the oil cooler
Operating Function: Controls oil temperature during start-up and normal operation
Main Benefits: Maintains correct oil temperature, supports lubrication and cooling, protects the compressor element, and improves operating reliability.

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