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.

1. Closed Position: Spring force holds valve poppet closed against its seat.
2. Cracking Pressure: Upstream pressure overcomes spring force, valve begins to open.
3. Fully Open: At operating pressures above set point, valve remains fully open.
4. Re-closing: If upstream pressure drops, spring force closes valve to preserve downstream pressure.

• 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.