Kaeser MPV Maintenance Kit Replacement – 400711

The Kaeser 400711 MPV Kit is a maintenance component used for servicing the Minimum Pressure Valve (MPV) in compatible Kaeser rotary screw air compressors. Parts references identify 400711 as a “KIT, MPV CS, CSD”, while another Kaeser parts listing identifies it as an MPV kit.

Working Process

The Kaeser 400711 MPV Kit is used to maintain the minimum pressure valve located within the compressor’s oil-separation and compressed-air circuit. The MPV helps maintain the minimum required pressure inside the separator vessel during compressor operation.

When the compressor starts and begins producing compressed air, the minimum pressure valve remains controlled until sufficient internal pressure is established. Once the required pressure is reached, the valve opens to allow compressed air to flow efficiently toward the downstream air network.

Maintaining an appropriate pressure inside the separator system is important for proper oil circulation, lubrication and compressor operation. The MPV also helps prevent excessive pressure loss inside the compressor and supports the correct operation of the oil-separation system.

Over time, seals and other valve components can wear because of continuous pressure cycling, temperature and contamination. The 400711 MPV maintenance kit is used during servicing to replace applicable wear components and restore the valve’s sealing and operating performance.

Key Benefits

• Supports reliable minimum-pressure valve operation.
• Helps maintain required compressor internal pressure.
• Supports proper oil circulation and lubrication.
• Helps maintain efficient compressed-air flow.
• Reduces the risk of MPV leakage.
• Supports proper compressor loading and unloading.
• Helps restore valve performance during scheduled maintenance.
• Suitable for compatible Kaeser compressor systems.
• Helps improve reliability of the compressed-air circuit.

Maintenance Application

The 400711 is listed as an MPV kit for CS/CSD Kaeser compressor applications. The related 400711.1 is also documented as a Kaeser regulation/repair kit and as a maintenance kit for the MPV, so the exact suffix should be checked against the compressor’s parts list before ordering.

Important: Some aftermarket catalogs also use 400711 for unrelated products, so verify the Kaeser model and part suffix before purchasing.

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