Product Overview
The Minimum Pressure Valve (MPV, also known as pressure maintaining valve) is an essential safety & control component mounted at the outlet of oil‑gas separator for oil‑injected screw air compressors. It combines pressure‑holding and non‑return check functions, protecting airend, separator element and guaranteeing stable compressor operation. It is one of the most critical spare parts for rotary screw compressors.
Main Functions
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Build‑up lubrication pressure on start‑up: The valve stays closed during startup to build sufficient internal tank pressure, ensuring steady oil circulation for rotor & bearing lubrication and cooling, preventing premature wear caused by insufficient oil supply.
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Protect oil‑separator element: Maintain stable pressure inside separator tank, reduce air flow velocity across separator core, improve oil‑gas separation performance and reduce oil carry‑over, extend service life of separator filter.
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Non‑return / anti‑reverse flow: Acts as integrated check valve. Prevent compressed air from flowing back into airend during shutdown or unloading, avoid rotor reverse rotation and potential compressor damagevanscheng.....
Key Features & Advantages
✅ Heavy‑duty durable construction: High‑strength aluminum alloy valve body, stainless steel spring & internal spool, high‑temperature FKM seals. Resist oil mist, high temperature and corrosion for harsh industrial working conditions. ✅ Precise cracking pressure: Factory calibrated opening pressure, fast response with limited pressure fluctuation, keep system running steadily. ✅ Optimized flow path & low pressure drop: Well‑designed inner channel minimizes flow resistance and energy loss without sacrificing air output performancevanscheng..... ✅ Wide replacement compatibility: Direct replacement for OEM parts of mainstream screw air compressor brands. Easy installation for quick old‑valve swap‑out. ✅ User‑friendly modular design: Convenient for disassembly, inspection and maintenance. Internal seal kits are available for overhaul.
General Specifications
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Application: Oil‑injected rotary screw air compressor
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Standard cracking pressure: 4.0‑4.5 bar (0.4‑0.45 MPa)
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Working temperature: ‑20℃ ~ +180℃
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Body material: Aluminum alloy; Internal parts: Stainless steel; Seals: FKM
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Connection: NPT / BSP thread or flange, multiple sizes available
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Compatible with: Atlas Copco, Sullair, Ingersoll Rand, Fusheng and other screw compressor models
When You Need To Replace MPV Valve
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Rapid pressure drop at unload stage, excessive oil carry‑over in compressed air
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Safety valve frequently blows off, motor overload trips
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Rotor reverse noise after compressor shutdown, air back‑flow issue
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Spool stuck, seal aging and internal leakage
About Us — Reliable Supplier
We are a one‑stop professional supplier for air compressor filter elements and spare parts, with more than 10‑year manufacturing & supplying experience, direct factory supply. Our product range covers full series of compressor filters, valves, repair kits and related accessories. Strict quality inspection before shipment. This minimum pressure valve comes with 1‑year warranty. We support bulk wholesale, OEM service and part‑number matching service. We deliver reliable air‑compressor spare‑part solutions for worldwide industrial clients.
Note: Please confirm your compressor model, OEM part number and connection size before ordering. Feel free to contact our technical team for part selection support.
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