Kaeser Inlet Valve Maintenance Kit 400990.0

The Kaeser Maintenance Kit Inlet Valve 400990.0 is a service component designed for maintenance of applicable Kaeser compressor inlet valves. Public Kaeser parts references identify 400990.0 as “Maintenance kit – Inlet valve.”

The inlet valve controls the air entering a screw compressor. Because the valve operates as part of the compressor’s intake and control system, maintaining its service components can help technicians keep the compressor operating correctly.

The 400990.0 kit should not be confused with the complete inlet valve assembly or the separate repair kit. Kaeser parts references list 400991.1 as the Repair Kit – Inlet Valve, while 400990.0 is listed as the maintenance kit.

Maintain the Compressor Inlet Valve

The compressor inlet valve manages the air entering the compression system. It works with the compressor’s control system to regulate intake conditions according to operating requirements.

Regular maintenance helps technicians inspect and service the valve before wear or contamination affects normal operation.

The 400990.0 maintenance kit provides a service-oriented solution for applicable inlet-valve maintenance requirements. Technicians should use the kit according to the applicable compressor maintenance procedure.

Support Smooth Air Intake

The compressor needs a properly functioning inlet system to draw air efficiently.

An inlet valve that does not operate correctly can affect compressor loading, unloading and overall intake control. Contamination, worn sealing components or mechanical wear can contribute to valve-related problems.

Servicing the applicable inlet valve with the correct maintenance kit helps technicians maintain the valve’s intended operating condition.

The 400990.0 part number is specifically identified as an inlet valve maintenance kit, so it should be matched to the appropriate compressor application rather than treated as a universal valve kit.

Support Reliable Compressor Operation

The inlet valve forms part of the compressor’s wider control system. Its condition can influence how the compressor responds during different operating states.

A properly maintained valve can help support stable intake control and normal compressor operation.

When technicians service the inlet valve, they should also inspect connected control lines, fittings, seals and other components for visible wear or damage.

This complete inspection can help identify issues that may otherwise return after replacing individual service components.

Choose the Correct 400990.0 Kit

Correct part identification is essential when ordering compressor maintenance kits.

Public Kaeser parts references list:

• 400990.0 – Maintenance Kit, Inlet Valve
• 400991.1 – Repair Kit, Inlet Valve
• 400892.0 – Maintenance Kit, Inlet Valve
• 400893.1 – Repair Kit, Inlet Valve

These different part numbers demonstrate why technicians should match the kit to the specific compressor and valve configuration instead of ordering solely by the general description “intake valve kit.”

Check the Compressor Model and Serial Number

Before ordering 400990.0, check the compressor identification information.

Confirm:

• Kaeser compressor model
• Compressor serial number
• Existing inlet valve part number
• Valve configuration
• Existing maintenance-kit number
• Compressor operating conditions
• Service documentation

A Kaeser parts list for an ASD 57 T Special compressor, for example, lists 400990.0 as the maintenance kit for the inlet valve assembly and separately lists 400991.1 as the repair kit.

This illustrates why application verification remains important.

Inspect the Inlet Valve Before Servicing

Technicians should inspect the inlet valve before deciding which service kit to use.

Check for:

• Contamination
• Seal wear
• Damaged components
• Air leakage
• Unusual valve movement
• Control-line issues
• Loose fittings
• Abnormal compressor loading or unloading

The correct maintenance kit can address scheduled service requirements, while a damaged valve may require a repair kit or replacement assembly instead.

Always follow the applicable Kaeser service procedure.

Perform Inlet Valve Maintenance Correctly

Before servicing an inlet valve, shut down the compressor and follow the manufacturer’s isolation and pressure-release procedure.

Technicians should prevent accidental compressor startup and make sure the system reaches a safe service condition before opening or removing components.

Clean the surrounding area before servicing the valve. This reduces the risk of introducing dirt into the compressor intake or control system.

Install service components carefully and inspect all sealing surfaces and connections before returning the compressor to operation.

Maintain the Compressor Control System

The inlet valve works together with other compressor control components.

During scheduled maintenance, technicians can inspect:

• Control lines
• Solenoid valves
• Valve seals
• Fittings
• Air connections
• Valve movement
• Intake components
• Related pressure-control components

This approach helps technicians identify the source of abnormal compressor behavior rather than replacing parts without checking the complete system.

Recognize Inlet Valve Problems

An inlet valve may require inspection when the compressor shows unusual operating behavior.

Possible symptoms can include:

• Unstable loading or unloading
• Abnormal intake operation
• Air leakage
• Unusual compressor cycling
• Reduced operating performance
• Control-related alarms
• Irregular pressure behavior

These symptoms do not automatically indicate an inlet-valve problem. Technicians should inspect the complete compressor control and air circuit before selecting a replacement component.

Support Preventive Compressor Maintenance

Preventive maintenance helps compressor operators identify worn components before they create larger service problems.

Including the inlet valve in the compressor’s maintenance program allows technicians to inspect valve components at appropriate service intervals.

Using the correct maintenance kit can also simplify planned service because technicians can identify the required kit by its specific part number.

For 400990.0, maintain accurate records of the compressor model, serial number, valve configuration and maintenance date.

Use 400990.0 for Applicable Kaeser Compressors

The Kaeser Maintenance Kit Inlet Valve 400990.0 is specifically listed in public parts references as a maintenance kit for the inlet valve.

A Kaeser ASD 57 T parts list also identifies 400990.0 as the maintenance kit for its inlet valve assembly.

However, different Kaeser compressor models use different inlet-valve maintenance and repair kit numbers. Therefore, verify the application before ordering.

Order Kaeser Inlet Valve Maintenance Kit 400990.0

If you need 400990.0, provide the compressor model and serial number when requesting the part.