Welcome to Ningbo Hyforce Hydraulic Machinery Co., Ltd.
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| Quantity: | |
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MPRV-02-A-K-1, MPRV-02-A-K-2, MPRV-02-A-K-3, MPRV-02-A-K-4, MPRV-03-A-K-1, MPRV-03-A-K-2, MPRV-03-A-K-3, MPRV-03-A-K-4, MPRV-04-A-K-1, MPRV-04-A-K-2, MPRV-04-A-K-3, MPRV-04-A-K-4, MPRV-02-B-K-1, etc.
HYFORCE HYDRAULICS / OEM is also avaliable.
B15-B16
The MPRV Series Modular Pressure Reducing Valve is a precision hydraulic control component designed to maintain a constant, reduced pressure in a secondary circuit regardless of fluctuations in the main system pressure. This modular, direct-acting valve delivers stable downstream pressure regulation in a compact sandwich-mounting configuration, eliminating the need for external piping while ensuring reliable performance in demanding industrial applications.
Function | Description |
|---|---|
Pressure Reduction | Reduces incoming high-pressure supply to a lower, adjustable downstream pressure level |
Pressure Regulation | Maintains constant outlet pressure despite variations in inlet pressure or load demands |
Flow Stabilization | Ensures consistent actuator performance under varying load conditions |
Reverse Free Flow | Integral check valve allows unrestricted return flow when pressure at the reduced port exceeds the valve setting |
Modular Integration | Direct sandwich mounting between directional valves and subplates for streamlined circuit design |
Clamping Circuits – Maintaining consistent clamping force in machine tools and fixtures
Auxiliary Circuit Control – Providing lower pressure for control circuits, pilot lines, or secondary actuators
Material Handling – Regulating pressure for gripping, vacuum, or gentle handling operations
Injection Molding – Controlling ejector, core pull, or secondary motion pressures
Mobile Equipment – Managing implement circuits requiring lower pressure than the main hydraulic system
Test & Measurement Systems – Delivering precise, stable pressure for calibration and inspection equipment
In CNC machining centers, the main hydraulic system typically operates at 100–160 bar for high-force clamping. However, delicate workpieces or specialized fixtures may require gentler holding forces to prevent distortion. The MPRV is installed in the fixture clamping circuit to reduce pressure to 20–50 bar as needed. Even as the main system pressure fluctuates during tool changes or spindle operations, the MPRV maintains consistent clamping force—ensuring part quality and repeatability.
Modern hydraulic presses often feature multiple actuators with different force requirements. For example, a die spotting press requires:
Main ram: 250 bar for pressing force
Ejector system: 80 bar for part removal
Die cushion: 40 bar for blank holding
A single MPRV installed at each secondary circuit inlet provides independent pressure regulation from the common high-pressure supply, eliminating the need for separate pumps or complex pump unloading arrangements.
Proportional and servo valves require clean, stable pilot pressures (typically 20–40 bar) for optimal response characteristics. The MPRV extracts pilot supply from the main system pressure and maintains it within tight tolerances. The integral reverse free-flow check valve ensures rapid pilot exhaust when directional valves shift, preventing sluggish response or "sticking" behavior.
In robotic gripping applications, excessive gripping pressure can damage delicate products (electronics, glass, food items). The MPRV allows precise pressure setting for gentle yet secure handling. As the robot accelerates and decelerates, load-induced pressure spikes are isolated from the gripper circuit—maintaining consistent holding force throughout the motion cycle.
While the main injection and clamping circuits operate at high pressure, auxiliary functions such as:
Core pull cylinders
Ejector plates
Hot runner valve gates
Mold adjust mechanisms
often require significantly lower pressures. The MPRV provides dedicated pressure reduction at each function, enabling independent optimization of timing and force profiles without affecting the main machine hydraulics.
In agricultural tractors and construction equipment, the main system pressure may reach 250–300 bar for heavy lifting, while implements such as:
Mower hydraulics
Seeder control cylinders
Attachment quick-couplers
require only 50–100 bar. The MPRV protects these lighter-duty components from over-pressurization while delivering consistent performance across varying engine speeds and pump outputs.
Precision Pressure Control – Direct-acting design provides responsive, stable pressure regulation with minimal drift
Wide Adjustment Range – Adjustable from 7 bar to 200 bar (secondary pressure) to suit diverse application requirements
Integral Reverse Flow – Built-in check valve eliminates the need for external return line components
Compact Modular Construction – Sandwich mounting saves up to 60% installation space compared to inline reducing valves
Excellent Stability – Hardened spool and seat materials minimize wear-induced pressure variation over extended service life
Easy Field Calibration – Knurled adjustment knob with locking mechanism prevents unauthorized or vibration-induced setting changes
Minimal Pressure Override – Fast response to load changes maintains set pressure within ±3% under dynamic conditions
Parameter | Typical Range |
|---|---|
Max. Inlet Pressure | 315 bar (4,570 psi) |
Max. Reduced (Outlet) Pressure | 200 bar (2,900 psi) |
Pressure Adjustment Range | 7–200 bar (100–2,900 psi) |
Max. Flow Capacity | Up to 60 L/min (15.8 GPM) |
Mounting Pattern | ISO 4401 / CETOP 03, 05, 07 |
Operating Temperature | -20°C to +80°C (-4°F to +176°F) |
Fluid Compatibility | Mineral oil, phosphate ester, water-glycol, biodegradable fluids |
Internal Leakage | < 50 mL/min at max. pressure differential |
Condition | Valve Response |
|---|---|
Normal Operation | Maintains constant outlet pressure by throttling excess flow to tank; opens further as downstream demand increases |
Inlet Pressure Rise | Valve automatically adjusts to maintain set outlet pressure regardless of supply pressure fluctuations |
Reverse Flow Required | When downstream pressure exceeds upstream, the integral check valve opens fully for unrestricted return flow |
Dead-End Circuit | Valve closes tightly to prevent pressure buildup beyond the set point when actuator reaches end-of-travel |
Cost Efficiency – Single high-pressure pump serves multiple circuits at different pressure levels
Energy Optimization – Reducing valve throttling is more efficient than pump unloading for continuous low-pressure demands
Component Protection – Secondary actuators and seals operate within rated pressure limits, extending service life
Simplified Troubleshooting – Modular mounting provides clear visual access and easy isolation for maintenance
System Flexibility – Pressure settings can be modified in the field without pump or relief valve recalibration
plain
High-Pressure Supply (P) → Directional Valve → MPRV → Reduced Pressure Circuit (A)
↓
Tank Return (T)The MPRV mounts directly beneath the directional control valve, with the reduced pressure port feeding the secondary actuator. Return flow from the actuator passes through the MPRV's integral check valve back to tank.
The MPRV Series Modular Pressure Reducing Valve delivers precise, reliable pressure control in an elegant, space-saving package—making it the ideal choice for designers seeking to optimize hydraulic system performance while minimizing complexity and installation costs.
