Atlas Copco VPM 8/10 Bar RLR 550 A 1500 Kit Replacement – 6219049400

Atlas Copco 6219049400 – VPM 8/10 Bar RLR 550 A 1500 Kit

The Atlas Copco 6219049400 (6219-0494-00) VPM Kit is a valve maintenance kit used in an oil-injected screw compressor. The VPM/Minimum Pressure Valve assembly controls compressed-air discharge from the compressor’s internal separator circuit and maintains the minimum pressure required for correct compressor operation.

Working Process:
When the compressor starts, the VPM remains closed or partially restricted. This allows pressure to build inside the separator vessel and compressor circuit before compressed air is delivered to the downstream air network.

Maintaining this initial internal pressure is important because the oil-injected compressor relies on a pressure differential for proper oil circulation. The circulating oil provides cooling, lubrication, and sealing for the screw compressor element.

Once the internal pressure reaches the valve’s specified opening pressure, the VPM begins to open. Compressed air can then pass from the separator vessel toward the downstream compressed-air system. The valve regulates the flow while helping maintain the required minimum internal pressure.

During normal loaded operation, the VPM continuously responds to the pressure difference between the compressor’s internal circuit and the downstream system. It allows compressed air to be delivered while preventing the internal pressure from falling below the required operating level.

When the compressor unloads or stops, the valve helps isolate the internal compressor circuit from downstream pressure. This reduces unwanted reverse flow and helps maintain suitable pressure conditions for the compressor’s next operating cycle.

The 6219049400 service kit is used when the VPM components become worn, damaged, contaminated, or lose their sealing performance. The official Atlas Copco listing includes a piston, Viton O-ring, seal washer, MPV housing, valve, and two springs. The listed kit weight is approximately 362.874 g.

During maintenance, the compressor must be stopped, isolated, and completely depressurized. The existing VPM components are removed and the valve housing and mating surfaces are inspected and cleaned. The replacement components from the kit are then installed in their correct positions.

After reassembly, the VPM should be checked for correct opening and closing, proper sealing, and leakage. The compressor should be tested through its starting, loading, unloading, and stopping sequences to verify correct pressure regulation.

A damaged or malfunctioning VPM can cause slow pressure build-up, unstable compressor pressure, poor oil circulation, excessive oil carryover, pressure loss, increased energy consumption, or incorrect compressor operation.

Correct installation of the 6219049400 VPM Kit helps restore minimum-pressure control, maintain proper oil circulation and air/oil separation, reduce operating problems, and support reliable compressor performance.

Part Number: 6219049400
Alternative Number: 6219-0494-00 / 6219 0494 00
Part Description: VPM Kit 8/10 Bar RLR 550 A 1500
Brand: Atlas Copco
Application: Oil-injected screw compressor
Component Type: Minimum Pressure Valve / VPM service kit
Pressure Rating: 8/10 bar
Kit Weight: Approximately 362.874 g
Primary Function: Maintains minimum internal compressor pressure and controls compressed-air discharge
Main Benefits: Supports oil circulation, air/oil separation, pressure stability, efficient operation, and reliable compressor performance.

Disclaimer: All manufacturer names, trademarks, model numbers, and part numbers are used solely for identification and compatibility purposes. Our products are high-quality aftermarket replacement products and are not manufactured, sponsored, endorsed, or authorized by the original equipment manufacturer (OEM). All trademarks remain the property of their respective owners.