Atlas Copco Oil Stop Valve Kit Replacement – 2901001600

Atlas Copco 2901001600 – Oil Stop Valve Kit

The Atlas Copco 2901001600 (2901-0016-00) Oil Stop Valve Kit is a service and maintenance kit designed for compatible oil-injected rotary screw compressors. Its primary function is to control compressor oil flow and prevent unwanted oil migration into the compressor air-end when the compressor unloads or stops.

Working Process:

During normal compressor operation, the screw air-end requires a controlled supply of compressor oil for lubrication, cooling, sealing, and efficient compression. The oil circulates through the compressor oil circuit under pressure.

The Oil Stop Valve regulates the oil passage to the compressor air-end. When the compressor is running, the operating pressure acts on the valve mechanism and moves the spring-loaded valve into its operating position. This permits the required quantity of oil to flow toward the air-end.

The circulating oil lubricates the rotating screw components, removes heat generated during compression, and assists in sealing the internal clearances between the screw rotors.

When the compressor unloads or stops, the pressure conditions in the oil circuit change. The spring inside the Oil Stop Valve returns the valve toward its closed position.

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

This function is important because uncontrolled oil migration can cause excessive oil accumulation in the air-end. Such a condition can result in difficult starting, increased oil consumption, oil carryover, abnormal compressor operation, or additional loading during restart.

Atlas Copco’s official catalog identifies 2901001600 as “KIT VALVE OIL STOP FOR OIL INJECTED SCREW COMPRESSOR” and “KIT OIL STOP VALVE.” The official catalog specifies a kit weight of 40 g.

The official component list includes:

• O-ring 13.3 × 2.4 – 1 pc
• Seal Washer M32 – 2 pcs
• Oil Stop Valve Spring – 1 pc
• Dowty Seal Washer 1/2+ – 1 pc
• O-ring 54.5 × 3 – 1 pc
• IN.SH 0016 – 1 pc

These components work together to restore the valve’s spring force, sealing performance, and oil-flow control.

The Oil Stop Valve provides the primary oil-flow control. The spring provides the closing force when compressor operating pressure decreases. The O-rings, seal washers, and Dowty seal prevent oil leakage and maintain the required sealing around the valve assembly.

During continuous compressor operation, these components are exposed to hot compressor oil, pressure fluctuations, vibration, temperature changes, and repeated loading and unloading cycles.

Over time, the valve may become contaminated or worn, the spring may lose its original closing force, and sealing components may harden, deform, or deteriorate.

A defective Oil Stop Valve may fail to close correctly after compressor shutdown. This can allow oil to migrate into the air-end and may result in excessive oil accumulation, increased oil carryover, increased oil consumption, difficult starting, or abnormal compressor operation.

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

Maintenance Procedure:

Before servicing the Oil Stop Valve, the compressor must be stopped, electrically isolated, completely depressurized, and allowed to cool.

The existing Oil Stop Valve assembly should be removed according to the applicable Atlas Copco maintenance procedure.

The valve, spring, O-rings, seal washers, sealing surfaces, and oil passages should be inspected for wear, contamination, corrosion, deformation, and leakage.

Worn sealing and valve components should be replaced using the 2901001600 Oil Stop Valve Kit.

All O-rings and sealing washers must be installed carefully without twisting, cutting, or damaging the sealing surfaces. The spring and valve components must be installed in their correct positions and orientations.

After reassembly, the compressor should be checked for oil leakage and correct valve movement.

The compressor should then be operated through its start-up, loaded, unloaded, and shutdown cycles.

During testing, the Oil Stop Valve should allow the required oil flow during normal compressor operation and close effectively when the compressor unloads or stops.

Correct operation of the Oil Stop Valve maintains proper oil circulation during compressor operation while preventing unwanted oil migration during shutdown.

Using the Atlas Copco 2901001600 Oil Stop Valve Kit during scheduled maintenance helps restore oil-flow control, reliable sealing, proper shutdown behavior, reduced oil migration, and dependable compressor performance.

Part Number: 2901001600
Alternative Number: 2901-0016-00 / 2901 0016 00
Brand: Atlas Copco
Part Description: Oil Stop Valve Kit
Official Description: Kit Valve Oil Stop for Oil-Injected Screw Compressor
Component Type: Oil-stop valve service kit
Application: Compatible Atlas Copco oil-injected rotary screw compressors
Official Listed Weight: 40 g
Primary Function: Controls oil flow to the compressor air-end
Secondary Function: Prevents excessive oil migration during unloading and shutdown
Main Components: Oil-stop valve spring, O-rings, seal washers, Dowty seal, and associated valve components
Operating Function: Allows controlled oil circulation during operation and restricts oil flow when the compressor stops
Main Benefits: Proper lubrication, cooling, sealing, reduced oil migration, improved starting reliability, reduced oil carryover, and dependable compressor operation.