Atlas Copco Oil Stop Valve Service Kit Replacement – 2911014900

Atlas Copco 2911014900 – Oil Stop Valve Service Kit

The Atlas Copco 2911014900 (2911-0149-00) Oil Stop Valve Service Kit is a maintenance kit used for compatible Atlas Copco portable compressors. Its primary function is to control compressor oil flow and prevent excessive oil migration into the compressor air end when the machine is unloaded or stopped.

Working Process:

During normal compressor operation, lubricating oil is required in the compressor element for cooling, lubrication, sealing, and reliable operation. The oil circulates through the compressor oil circuit under controlled pressure.

The Oil Stop Valve regulates this oil flow. When the compressor is operating, the pressure generated within the oil circuit acts on the valve mechanism and allows the required oil to flow toward the compressor element.

The circulating oil performs its normal functions inside the compressor, including removing heat generated during compression and lubricating the moving components.

When the compressor unloads or stops, the pressure conditions in the oil circuit change. The spring-loaded oil-stop mechanism moves toward its closed position.

The valve restricts the oil passage and prevents excessive oil from draining or migrating into the compressor air end while the compressor is stationary.

This function is important because uncontrolled oil migration can cause excessive oil accumulation in the air end, difficult starting, increased oil consumption, oil carryover, or abnormal compressor operation.

Atlas Copco parts documentation identifies 2911014900 as “SERVICE KIT – OIL STOP VALVE.” Atlas Copco parts lists for portable compressors show the kit with the following service components:

• Piston – 1 pc
• Sealing washer – 2 pcs
• Spring – 1 pc
• Check valve – 1 pc
• Spring – 1 pc

These components work together to provide controlled oil flow, spring-assisted valve operation, one-way flow protection, and reliable sealing.

The piston responds to pressure changes and transfers operating force to the valve mechanism. The springs provide the necessary return and closing forces. The check valve helps prevent reverse flow, while the sealing washers maintain a leak-resistant connection.

During normal operation, these components are exposed to compressor oil, pressure fluctuations, vibration, temperature changes, and repeated loading/unloading cycles. Over time, the valve, piston, springs, and sealing washers may become worn, contaminated, or damaged.

A defective oil-stop valve may fail to close properly when the compressor stops. This can allow oil to migrate into the air end and may lead to excessive oil accumulation, increased oil consumption, oil carryover, or starting problems.

If the valve becomes restricted or fails to open correctly during operation, the oil supply to the compressor element may be reduced. Insufficient oil circulation can negatively affect lubrication, cooling, and sealing.

Maintenance Procedure:

Before servicing the valve, the compressor must be stopped, isolated from its energy source, completely depressurized, and allowed to cool.

The oil-stop valve assembly should be removed according to the applicable Atlas Copco service procedure. The piston, valve, springs, sealing washers, and mating surfaces should be inspected for wear, contamination, corrosion, deformation, and leakage.

Worn components should be replaced using the 2911014900 Oil Stop Valve Service Kit. The sealing washers must be installed correctly and without damage. The piston, check valve, and springs must be installed in their correct positions and orientations.

After reassembly, the valve assembly should be checked for proper movement and leakage.

The compressor should then be operated through its start-up, loaded, unloaded, and shutdown cycles. During testing, the oil-stop valve should permit the required oil flow during operation and close correctly when the compressor unloads or stops.

Correct operation of the oil-stop valve helps maintain proper oil circulation during compressor operation while preventing unwanted oil migration during shutdown.

Using the Atlas Copco 2911014900 Oil Stop Valve Service Kit during scheduled maintenance helps restore oil-flow control, reliable sealing, reverse-flow protection, proper shutdown behavior, and dependable compressor performance.

Part Number: 2911014900
Alternative Number: 2911-0149-00 / 2911 0149 00
Brand: Atlas Copco
Part Description: Service Kit – Oil Stop Valve
Component Type: Oil-stop valve service/repair kit
Application: Compatible Atlas Copco portable compressors
Primary Function: Controls oil flow and prevents excessive oil migration during shutdown
Main Components: Piston, sealing washers, springs, and check valve
Operating Function: Allows controlled oil circulation during operation and restricts oil flow during unloading/shutdown
Main Benefits: Proper lubrication, reduced oil migration, improved starting reliability, reduced oil carryover, reliable sealing, and dependable compressor operation.

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