ALMiG / ALUP Minimum Pressure Valve (MPV) Maintenance Kit Replacement – 212.00217

ALMiG / ALUP 212.00217 – Minimum Pressure Valve (MPV) Maintenance Kit

The 212.00217 Minimum Pressure Valve Maintenance Kit is a service kit used for maintaining the Minimum Pressure Valve (MPV) in ALMiG and ALUP oil-injected rotary screw compressors. The MPV performs two important functions: it maintains the minimum pressure required inside the compressor oil-separator circuit and prevents compressed air from flowing backward into the compressor.

Working Process:

During compressor start-up, the Minimum Pressure Valve remains closed or highly restricted. This allows pressure to build inside the oil separator vessel and compressor circuit before compressed air is delivered to the downstream air system.

Once the internal pressure reaches the required minimum level, the MPV opens and allows compressed air to flow from the separator toward the aftercooler and downstream compressed-air network.

Maintaining minimum internal pressure is essential in an oil-injected screw compressor because the pressure differential supports the circulation of compressor oil. The oil provides cooling, lubrication, and sealing for the screw compressor element.

During normal loaded operation, the MPV regulates the discharge path while maintaining sufficient pressure inside the separator circuit. This helps maintain stable oil circulation and supports effective air/oil separation.

The valve also acts as a non-return valve. When the compressor unloads or stops, downstream pressure can become higher than the pressure inside the compressor. The MPV closes to prevent compressed air from flowing backward into the separator and compressor element.

The 212.00217 kit is used to restore the sealing and operating performance of the MPV when its internal components become worn, contaminated, or damaged. Parts references describe it as an ALMiG Maintenance Set, MPV and a Minimum Pressure Valve Kit.

The kit is also documented for ALUP rotary screw compressors. One parts reference lists applications including SCK 61, SCK 76, SCK 102, OPUS 37, OPUS 45, ALLEGRO 40, ALLEGRO 60 and ALLEGRO 80.

During maintenance, the compressor must be stopped, isolated, and completely depressurized before the MPV is dismantled. The valve body, piston/valve element, springs, seals, sealing surfaces, and internal passages should be inspected for wear, contamination, corrosion, or damage.

The replacement seals, gaskets, and other service components supplied in the 212.00217 maintenance kit are installed according to the applicable compressor service procedure. Correct installation is important to ensure that the valve opens at the required pressure and seals properly when the compressor unloads or stops.

After servicing, the compressor should be tested through its complete start-up, loading, unloading, and shutdown cycle. The MPV should allow pressure to build during start-up, open correctly at the specified pressure, maintain stable internal pressure during operation, and close effectively during shutdown.

A worn or defective MPV can cause slow pressure build-up, unstable pressure, excessive oil carryover, poor oil circulation, reverse airflow, difficult starting, or increased compressor energy consumption.

Correct maintenance using the 212.00217 MPV Maintenance Kit helps restore minimum-pressure control, maintain proper oil circulation and air/oil separation, prevent reverse airflow, and support reliable and efficient compressor operation.

Part Number: 212.00217
Brand: ALMiG / ALUP
Part Description: Maintenance Set – Minimum Pressure Valve / MPV Repair Kit
Component Type: Minimum-pressure and non-return valve service kit
Application: Oil-injected rotary screw compressors
Primary Function: Maintains minimum internal compressor pressure
Secondary Function: Prevents reverse compressed-air flow
Maintenance Function: Restores worn seals and internal MPV components
Main Benefits: Stable pressure, proper oil circulation, effective air/oil separation, reliable starting, reduced leakage, and dependable compressor operation.

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