A Minimum Pressure Valve (MPV), also known as a Minimum Pressure Check Valve or a 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.

• 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 or at insufficient pressure.
• Avoid Cavitation: Prevents the formation of vacuum conditions that can cause cavitation in pumps and actuators.
• Sequencing: Ensures that certain actuators in a circuit do not operate until a minimum system pressure is available.
• Pressure Safety: Acts as a safety device to guarantee a baseline pressure for critical system functions.

1. Closed Position (Below Set Pressure): A spring force holds the valve poppet firmly closed against its seat. No flow can pass through the valve.
2. Cracking Pressure (Opening): When the upstream pressure overcomes the combined force of the spring and any downstream pressure, the poppet lifts off its seat.
3. Fully Open (Normal Operation): At operating pressures significantly above the set point, the valve remains fully open, offering minimal resistance to flow.
4. Re-closing: If the upstream pressure drops and approaches the minimum set pressure again, the spring force pushes the poppet back onto its seat.

• Pressure Rating: Up to 5,000 PSI (350 bar) and higher.
• Setting Range: Typically adjustable from 50 to 500 PSI (3.5 to 35 bar).
• Port Sizes: Common from SAE #4 to #12 (e.g., 1/2" to 1-1/2" NPT).
• Fluid Compatibility: Mineral-based hydraulic oil, synthetic fluids, water-glycol, and other common industrial fluids.
• Temperature Range: Standard seals from -20°C to 100°C (-4°F to 212°F). High-temperature options available.

• Mobile Machinery: Excavators, bulldozers, cranes, telehandlers, and forklifts.
• Industrial Machinery: Injection molding machines, presses, stamping presses, and metal forming equipment.
• Pump Outlets: Mounted directly on the outlet of piston pumps, vane pumps, and gear pumps for lubrication protection.
• Hydraulic Circuits: In winch, brake, and motor circuits to prevent load runaway.
• Test Rigs: To maintain a baseline pressure in complex test circuits.

• Superior Reliability: Hardened steel poppet and seat are precision lapped for a perfect seal, guaranteeing no-leak performance.
• Easy Adjustment & Installation: Externally accessible adjustment screw allows for easy pressure setting without disassembly.
• Proven Performance: Rigorously tested under real-world conditions to ensure durability in demanding applications.
• Global Support & Availability: Backed by worldwide technical support network and extensive distributor inventory.

To select the correct Minimum Pressure Valve for your application, please have the following information ready:

• Required Set Pressure Range (e.g., 150-200 PSI)
• Maximum System Flow (GPM or LPM)
• Maximum System Pressure (PSI or bar)
• Port Size & Type (e.g., SAE 10, 1" NPTF)
• Fluid Type & Temperature

Contact our engineering support team today for assistance in selecting the perfect MPV for your system.