Atlas Copco Oil Stop Valve & Check Valve Kit Replacement – 9095047600

Atlas Copco 9095047600 – Oil Stop Valve & Check Valve Kit

The Atlas Copco 9095047600 (9095-0476-00) Oil Stop Valve and Check Valve Kit is a service and maintenance kit used in compatible Atlas Copco oil-injected screw compressor systems. Its main function is to control compressor oil flow and prevent unwanted reverse oil flow, particularly during compressor unloading and shutdown.

Working Process:

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

The Oil Stop Valve (OSV) regulates the oil passage to the compressor air end. When the compressor is running, the operating pressure acts on the valve mechanism and moves it into the open position, allowing the required quantity of oil to circulate.

The circulating oil lubricates the moving screw components, removes heat generated during compression, and assists in sealing the internal clearances of the screw element.

The Check Valve (CV) provides one-way flow control. It allows oil or pressure to move in the intended direction while preventing reverse flow when the pressure differential changes.

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

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

At the same time, the Check Valve prevents unwanted reverse flow through the oil circuit. This helps maintain the correct pressure and oil-flow conditions during unloading and shutdown.

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

Available parts references identify 9095047600 as “Oil Stop Valve Kit” and also as “Kit Oil Stop Valve + Check Valve.” Atlas Copco-related procurement documentation specifically lists 9095 0476 00 as the Kit Oil Stop Valve & Check Valve for the GA160W transport air compressor.

The kit combines the oil-stop and check-valve functions so that the oil circuit can operate correctly during both compressor running and shutdown conditions.

The Oil Stop Valve controls the oil passage, while the Check Valve prevents reverse flow. Springs provide the necessary return and closing force, while sealing components maintain a leak-resistant connection between the valve assembly and compressor housing.

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

Over time, the valve components, springs, and seals can become worn, contaminated, hardened, or damaged.

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

A defective Check Valve may allow reverse oil flow through the circuit. This can disturb the intended oil-flow direction and cause unwanted oil or pressure migration.

If the valve becomes restricted or fails to open correctly during operation, the required 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 assembly, the compressor must be stopped, isolated from its energy source, completely depressurized, and allowed to cool.

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

The valve components, springs, sealing surfaces, and associated passages should be inspected for wear, contamination, corrosion, deformation, and leakage.

Worn components should be replaced using the 9095047600 Oil Stop Valve & Check Valve Kit. Sealing components must be installed correctly without twisting, cutting, or damaging the sealing surfaces. The Oil Stop Valve, Check Valve, and springs must be installed in their correct positions and orientations.

After reassembly, the compressor should be checked for oil and air leakage.

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

During testing, the Oil Stop Valve should permit the required oil circulation during compressor operation and close effectively when the compressor unloads or stops. The Check Valve should prevent unwanted reverse flow.

Correct operation of the assembly helps maintain proper oil circulation during compressor operation while reducing oil migration and reverse flow during shutdown.

Using the Atlas Copco 9095047600 Oil Stop Valve & Check Valve Kit during scheduled maintenance helps restore oil-flow control, reverse-flow protection, reliable sealing, proper shutdown behavior, and dependable compressor performance.

Part Number: 9095047600
Alternative Number: 9095-0476-00 / 9095 0476 00
Brand: Atlas Copco
Part Description: Oil Stop Valve & Check Valve Kit
Official/Parts Description: Kit Oil Stop Valve + Check Valve
Component Type: Oil-stop and non-return valve service kit
Known Application: GA160W transport/portable air compressor
Primary Function: Controls oil flow and prevents unwanted reverse flow
Operating Function: Allows controlled oil circulation during operation and restricts oil migration during unloading/shutdown
Main Benefits: Proper lubrication, reduced oil migration, reverse-flow protection, reliable sealing, improved shutdown performance, and dependable compressor operation.

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