Atlas Copco Minimum Pressure Valve (MPV) Kit Replacement – 2901099700

Atlas Copco 2901099700 – Minimum Pressure Valve (MPV) Kit

The Atlas Copco 2901099700 (2901-0997-00) Minimum Pressure Valve Kit is a service kit designed for oil-injected screw compressors. The Minimum Pressure Valve (MPV) controls the discharge of compressed air from the separator vessel and helps maintain the minimum internal pressure required for proper compressor operation.

Working Process:
When the oil-injected screw compressor starts, the Minimum Pressure Valve remains closed or substantially restricted while pressure builds inside the separator vessel. This allows the compressor to quickly establish the minimum internal pressure required for correct oil circulation and efficient separation of oil from compressed air.

As the pressure inside the separator vessel increases and reaches the valve’s opening pressure, the MPV opens progressively. Compressed air can then pass from the separator vessel toward the aftercooler and downstream compressed-air network.

Maintaining adequate internal pressure is important because the pressure difference within the compressor helps circulate oil through the oil-injection system. The oil provides cooling, lubrication, and sealing to the screw compressor element. The MPV therefore contributes indirectly to proper lubrication, temperature control, and reliable compressor operation.

During normal operation, the valve continuously responds to pressure differences between the compressor’s internal circuit and the downstream air system. It allows sufficient airflow while helping prevent the internal pressure from falling below the required minimum level.

When the compressor unloads or stops, the MPV helps isolate the compressor’s internal pressure from the downstream system and prevents unwanted reverse flow. This assists the compressor in maintaining the appropriate internal conditions for unloading and subsequent restarting.

The 2901099700 service kit is used when the internal MPV components become worn, contaminated, damaged, or lose their sealing performance. The official Atlas Copco kit includes replacement components such as springs, piston, O-rings, seals, seal washer, and valve assembly, together with grease and service documentation.

A worn or malfunctioning MPV can cause slow pressure build-up, unstable operating pressure, poor oil circulation, excessive oil carryover, increased energy consumption, or incorrect compressor loading and unloading.

During preventive maintenance, the compressor should be isolated and completely depressurized before the MPV is serviced. The existing valve components are removed and inspected, the valve body and mating surfaces are cleaned, and the replacement components supplied in the 2901099700 kit are installed according to the applicable service procedure.

After reassembly, the valve should be checked for correct opening and closing behavior, leakage, and proper pressure regulation. Correct maintenance of the MPV helps maintain stable compressor pressure, efficient oil circulation, reliable air/oil separation, and long-term compressor performance.

Part Number: 2901099700
Alternative Number: 2901-0997-00 / 2901 0997 00
Part Description: MPV Kit / Minimum Pressure Valve Kit
Brand: Atlas Copco
Application: Oil-injected screw compressors
Component Type: Minimum pressure and pressure-control valve service kit
Primary Function: Maintains minimum internal pressure and controls compressed-air discharge
Official Kit Weight: 217 g
Main Benefits: Supports proper oil circulation, air/oil separation, pressure regulation, efficient operation, and reliable compressor performance.

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