Atlas Copco Oil Stop Valve Kit C106 Replacement – 2901021701

Atlas Copco 2901021701 – Oil Stop Valve Kit C106

The Atlas Copco 2901021701 (2901-0217-01) Oil Stop Valve Kit C106 is a service kit used in the oil circuit of an oil-injected rotary screw compressor. Its primary function is to control oil flow to the compressor element and prevent unwanted oil migration when the compressor is unloaded or stopped.

Working Process:
During normal compressor operation, the oil-injected screw element requires a continuous supply of oil for cooling, lubrication, and sealing. The oil stop valve operates according to the pressure conditions in the compressor oil circuit and permits the required oil flow during running conditions.

When the compressor is operating under load, the pressure differential across the oil circuit causes the oil stop valve to open. This allows compressor oil to circulate through the required passages and reach the air end, where it absorbs heat, lubricates the rotating screw components, and assists in sealing the internal clearances.

When the compressor unloads or stops, the pressure conditions change. The spring-loaded oil stop valve moves toward the closed position and restricts the oil passage. This prevents excessive oil from continuing to flow into the compressor element when oil circulation is no longer required.

The closing action is particularly important during shutdown because it helps prevent oil from migrating into the air end and accumulating there. This supports cleaner shutdown conditions and helps reduce the possibility of oil carryover, oil flooding, or difficult starting.

The 2901021701 kit restores the sealing and operating function of the oil stop valve when its internal components become worn, contaminated, or damaged. Atlas Copco’s official listing specifies components including one oil-stop valve, one spring, O-rings, and several sealing washers. The official listed kit weight is 106 g.

During maintenance, the compressor should be shut down, isolated, and completely depressurized. The oil circuit should be allowed to cool before servicing. The existing valve components are removed, and the valve body, passages, and mating surfaces are inspected for contamination, wear, or damage.

The replacement valve, spring, O-rings, and sealing washers from the 2901021701 kit are then installed in the correct orientation. Proper sealing is important to prevent both external oil leakage and unwanted internal oil flow.

After assembly, the compressor should be tested through its starting, loading, unloading, and shutdown cycles. The oil stop valve should open correctly during operation and close effectively when the compressor unloads or stops.

A defective oil stop valve may remain open, allowing excessive oil migration, or may fail to open properly, restricting oil circulation. Either condition can lead to increased oil consumption, excessive oil carryover, poor lubrication, overheating, starting difficulties, or reduced compressor reliability.

Correct installation and maintenance of the 2901021701 Oil Stop Valve Kit C106 helps maintain controlled oil circulation, prevent unwanted oil migration, protect the compressor air end, and support efficient and reliable compressor operation.

Part Number: 2901021701
Alternative Number: 2901-0217-01 / 2901 0217 01
Part Description: Oil Stop Valve Kit C106
Brand: Atlas Copco
Application: Oil-injected screw compressors
Component Type: Oil-flow control/service valve kit
Official Listed Weight: 106 g
Primary Function: Controls oil flow and prevents unwanted oil migration during unloading and shutdown
Kit Components: Oil-stop valve, spring, O-rings, and sealing washers
Main Benefits: Maintains proper lubrication, reduces oil migration, supports clean shutdown, protects the air end, and improves compressor reliability.

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