Kaeser Control Line Kit Replacement – 400867.0

Kaeser 400867.0 – Control Line Kit

The Kaeser 400867.0 Control Line Kit is a pneumatic control-system service kit used in compatible Kaeser stationary rotary screw air compressors. Its primary function is to provide reliable control-air connections between the compressor’s valves, regulators, pressure-sensing components, and pneumatic actuators.

Working Process:

During compressor operation, compressed control air is routed through the pneumatic control lines to operate various control components. The control lines transmit pressure signals from one component to another, allowing the compressor control system to respond automatically to changing operating conditions.

When the compressor starts, pneumatic control pressure is established through the control-line circuit. These pressure signals can actuate the inlet/unloader system and other pneumatic control devices, allowing the compressor to start with reduced load.

Once the compressor reaches operating speed, the control system changes the pneumatic pressure signals supplied to the relevant valves. The control lines transfer these signals accurately so that the inlet valve can open and the compressor can enter loaded operation.

During loaded operation, the control system continuously monitors compressor pressure. When the system pressure changes, corresponding pneumatic signals are transmitted through the control lines to the appropriate regulating or actuating components.

When the required discharge pressure is reached, the controller initiates the unloading sequence. The pneumatic control signal changes, causing the unloader or inlet-control mechanism to restrict the compressor’s air intake. This reduces the compression load and allows the compressor to operate in an unloaded condition with lower power consumption.

When system pressure falls again, the control circuit sends the appropriate signal to return the compressor to loaded operation.

The 400867.0 Control Line Kit therefore does not normally produce or regulate compressed air itself. Instead, it provides the pneumatic communication path that allows the compressor’s control components to exchange pressure signals and operate correctly.

The part is identified in Kaeser parts references as “Control line kit” and is used across multiple Kaeser rotary screw compressor configurations. Parts catalogs list it alongside components for SK, SM and ASK-series machines.

The control lines and fittings are exposed to vibration, pressure fluctuations, temperature changes, oil mist, and continuous compressor operation. Over time, tubing can become brittle, cracked, kinked, contaminated, or damaged, while fittings and connection points can develop leakage.

A leaking or damaged control line can cause incorrect pneumatic signals. This may result in delayed loading, failure to unload, unstable pressure regulation, excessive energy consumption, or malfunction of connected pneumatic valves.

During maintenance, the compressor should be stopped, isolated, and completely depressurized before the control-line circuit is serviced. The existing tubing, hoses, fittings, and connection points should be inspected for cracks, deformation, contamination, loose connections, and leakage.

The replacement components supplied in the 400867.0 kit should be installed according to the applicable Kaeser service procedure. Correct routing is important to prevent kinking, excessive vibration, abrasion, or interference with moving and hot compressor components.

After installation, the control circuit should be checked for air leakage. The compressor should then be tested through its complete start-up, loading, unloading, and shutdown sequence.

The control pressure signals should respond correctly and the connected valves or actuators should move smoothly and at the appropriate operating points.

A damaged control line can cause loss of pneumatic control pressure, incorrect valve operation, compressor loading/unloading problems, unstable pressure, and reduced compressor efficiency.

Correct maintenance using the Kaeser 400867.0 Control Line Kit helps restore reliable pneumatic signaling, accurate valve actuation, stable load/unload operation, reduced control-air leakage, and dependable compressor performance.

Part Number: 400867.0
Alternative Format: 4008670
Brand: Kaeser
Part Description: Control Line Kit
Component Type: Pneumatic control-line service kit
Application: Kaeser stationary rotary screw air compressors
Known Applications: Various Kaeser SK, SM and ASK-series configurations
Primary Function: Routes pneumatic control-air signals between compressor control components
Operating Function: Supports pressure sensing, valve actuation, and load/unload control
Main Benefits: Reliable pneumatic signaling, accurate valve operation, stable pressure control, reduced leakage, and dependable compressor operation.

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