Product Overview
Minimum Pressure Valve (MPV, also known as pressure‑maintaining valve) is an essential safety & control component mounted at the outlet of oil‑gas separator tank for oil‑injected screw air compressorsrockymachi.... Adopting spring‑loaded spool structure for automatic pressure management. It builds minimum system pressure during startup to guarantee normal lubrication flow; opens for air supply once reaching preset cracking pressure; acts as a check valve upon shutdown to prevent compressed air back‑flow from pipeline to separator tank. It protects separator core and helps avoid oil carry‑over, safety valve blowing, motor overload and other malfunctions, which is a key replacement part for compressor overhaul & maintenance. This is high‑quality OEM replacement part. Dimension, cracking pressure and flow performance match OEM specifications for drop‑in installation.
Key Features
✅ Stable Pressure Build‑up for Air‑end Lubrication Valve stays closed at startup to quickly build internal separator pressure, ensuring sufficient oil circulation & cooling. Prevent abnormal wear on rotor and bearing caused by insufficient oil supplyrockymachi.... Standard cracking pressure: 0.4‑0.5 MPa, factory calibrated.
✅ Protect Separator Core & Reduce Oil Carry‑over Limits outlet air flow velocity, avoid damage to separator element, improve oil‑gas separation efficiency, lower residual oil content in compressed air and reduce abnormal oil consumptionRocky Comp....
✅ Built‑in Non‑Return Check Function Against Air Back‑flow Automatically closes during shutdown / unload cycle, blocks high‑pressure air from piping flowing backward into separator tank. Avoid heavy‑load pressurized startup and related equipment damage risk.
✅ Industrial‑grade Construction for Harsh Working Condition High‑strength alloy valve body; fatigue‑resistant reinforced spring; oil‑heat resistant FKM sealing components. Resist oil sludge and pressure pulsation, reduce spool sticking & seal leakage for long‑term high‑temperature high‑pressure operation艾高.
✅ Exact OEM Fit, Direct Replacement & Lower Maintenance Cost Identical mounting dimension, cracking pressure and flow characteristic as original spare parts. No pipe modification required. Timely replacement avoids unplanned downtime caused by safety valve blow‑off, motor overload or pressure‑building failure, saving expensive repair cost.
Working Principle
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Compressor Startup: When internal pressure is below cracking pressure, spring keeps spool closed. Pressure accumulates inside separator tank to form pressure difference required for lubricating oil circulation.
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Pressure Reaches Set‑point: Internal air pressure overcomes spring preload, pushes spool open, compressed air flows out to downstream pipeline.
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Shutdown & Unloading: System pressure drops, spring resets and presses sealing surface tight. Valve closes to realize check‑valve effect and isolate reverse airflow from pipe networkcompressor....
Specifications
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Item: Minimum Pressure Valve (MPV / Pressure Maintaining Valve)
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Application: Oil‑injected Screw Air Compressor
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Standard Cracking Pressure: 0.4‑0.5 MPa (custom available)
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Body Material: High‑strength Alloy
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Internal Parts: Reinforced spring, FKM oil‑resistant seals
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Mounting Position: Outlet of oil‑gas separator tank
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Installation: Direct drop‑in replacement, no pipe modification
About Us — Reliable Supplier
We are a one‑stop supplier specializing in air compressor filter elements and full‑range spare parts, with more than 10‑year experience in compressor accessories manufacturing & export. Factory direct supply without middleman markup. We supply complete spare parts for major compressor brands including Atlas Copco, Ingersoll Rand, Sullair, Fusheng and more: filter kits, thermostatic valves, minimum pressure valves, intake valves, drain valves and repair kits. Sample orders and bulk wholesale are both welcome. 👉 Warranty: 12‑month warranty for this item. After‑sales technical support is available for non‑artificial quality defects.
Notes
Common MPV failure symptoms: unable to build system pressure, excessive oil carry‑over, frequent safety valve blow‑off, motor overload trip, obvious hissing back‑flow noise after shutdown. Inspect or replace MPV if above symptoms occur. Clean oil sludge and impurities in pipeline during replacement to prevent spool stuck by debris.
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