Ingersoll-Rand 42855437 Minimum Pressure Valve 50-500 PSI
A Minimum Pressure Valve (MPV), also known as a Minimum Pressure Check Valve or Pressure Holding Valve, is an automatic, spring-loaded precision valve designed to maintain a pre-set minimum system pressure in a fluid power circuit. Its primary function is to prevent system pressure from falling below a critical threshold, ensuring optimal operation and protection of downstream components.
The MPV acts as a guardian of your hydraulic or pneumatic system. It remains closed until a pre-determined "cracking pressure" is achieved upstream. Once this pressure is reached and surpassed, the valve opens to allow full flow.
Its core purposes are:
- Maintain Load Holding: Prevents loads from dropping uncontrollably in cylinders or hydraulic motors due to pressure loss.
- Ensure Pump Lubrication: Keeps adequate pressure on lubricated pumps to prevent damage from running dry.
- Avoid Cavitation: Prevents vacuum conditions that can cause cavitation in pumps and actuators.
- Sequencing: Ensures actuators don't operate until minimum system pressure is available.
- Pressure Safety: Guarantees baseline pressure for critical system functions.
- Closed Position: Spring force holds valve poppet closed against its seat.
- Cracking Pressure: Upstream pressure overcomes spring force, valve begins to open.
- Fully Open: At operating pressures above set point, valve remains fully open.
- Re-closing: If upstream pressure drops, spring force closes valve to preserve downstream pressure.
| Feature | Benefit |
|---|---|
| Precision Spring Setting | Accurate and reliable minimum pressure setting |
| Low Pressure Drop | Full flow with minimal energy loss when open |
| Robust Poppet & Seat Design | Excellent sealing with zero leakage |
| Compact & Rugged Construction | Withstands high pressures and harsh environments |
| Optional Check Valve Function | Allows free reverse flow when needed |
- Pressure Rating: Up to 5,000 PSI (350 bar)
- Setting Range: Adjustable from 50 to 500 PSI (3.5 to 35 bar)
- Port Sizes: SAE #4 to #12 (1/2" to 1-1/2" NPT)
- Fluid Compatibility: Mineral-based hydraulic oil, synthetic fluids, water-glycol
- Temperature Range: -20°C to 100°C (-4°F to 212°F)
- Mobile Machinery: Excavators, bulldozers, cranes
- Industrial Machinery: Injection molding machines, presses
- Pump Outlets: Mounted on piston, vane, and gear pumps
- Hydraulic Circuits: Winch, brake, and motor circuits
- Test Rigs: Maintains baseline pressure in test circuits
- Superior Reliability: Hardened steel poppet and seat for perfect seal
- Easy Adjustment: Externally accessible adjustment screw
- Proven Performance: Tested in demanding applications
- Global Support: Worldwide technical support network
To select the correct Minimum Pressure Valve, please provide:
- Required Set Pressure Range
- Maximum System Flow
- Maximum System Pressure
- Port Size & Type
- Fluid Type & Temperature
Contact our engineering support team today for assistance in selecting the perfect MPV for your system.
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