MSRV Series Modular Solenoid Operated Relief Valves

Overview

The MSRV Series Modular Solenoid Operated Relief Valve is an advanced electro-hydraulic pressure control component that combines the reliability of a direct-acting relief valve with the flexibility of solenoid actuation. This modular valve enables remote, automated pressure regulation—allowing hydraulic systems to switch between multiple pressure settings or unload the pump on command. Available in configurations such as MSRV-02 and MSRV-03, this valve is ideal for modern industrial automation and energy-efficient hydraulic designs.

Key Functions

Primary Applications

• Injection Molding Machines – Automatic switching between high-pressure clamping and low-pressure cooling phases

• CNC Machine Tools – Programmable pressure control for different machining operations and tool changes

• Hydraulic Presses – Automated transition between pressing force and rapid advance/return speeds

• Material Handling & Logistics – Energy-saving standby mode for conveyor systems and automated warehouses

• Mobile Equipment – Remote pressure adjustment for excavators, aerial platforms, and agricultural machinery

• Test & Simulation Systems – Computer-controlled pressure profiling for R&D and quality testing

Detailed Usage Scenarios

Scenario 1: Energy-Efficient Pump Unloading

In hydraulic systems with long idle periods (e.g., automated production lines with intermittent cycles), the MSRV eliminates the need for a separate unloading valve. When the machine enters standby mode, the solenoid energizes to open the relief path fully—reducing pump delivery pressure to near-zero. This reduces power consumption by 60-80%, minimizes fluid heating, and extends pump and fluid service life. When production resumes, the solenoid de-energizes and the system immediately returns to full working pressure.

Scenario 2: Dual-Pressure Operation (High/Low Pressure Switching)

Many manufacturing processes require two distinct pressure levels. In a die casting machine, the MSRV maintains high pressure (e.g., 200 bar) during the critical metal injection phase. Once the cavity fills, the controller energizes the solenoid to drop system pressure to a lower holding level (e.g., 50 bar) for cooling and solidification—optimizing cycle time while maintaining part quality. The manual adjustment knob sets the high-pressure limit; the solenoid selects the low-pressure stage.

Scenario 3: Automated Tool Change in CNC Machines

During tool changes, cutting forces are absent and high system pressure is unnecessary. The MSRV receives a signal from the machine's PLC to switch to low-pressure mode, enabling faster, safer tool magazine rotation and spindle positioning. Upon tool engagement, the valve returns to high-pressure mode for machining operations—seamlessly integrating with the machine's automation sequence.

Scenario 4: Emergency Pressure Dump & Safety Interlocking

In safety-critical applications (such as hydraulic elevators or stage lifting platforms), the MSRV serves as a redundant safety valve. A hardwired emergency stop circuit energizes the solenoid to immediately relieve system pressure, enabling controlled descent or mechanical locking. This electrical override provides faster response than traditional hydraulic pilot circuits and integrates easily with modern safety PLCs and light curtain systems.

Scenario 5: Multi-Machine Central Hydraulic Systems

In central hydraulic power units supplying multiple machines, MSRV valves at each station enable individual pressure customization. The central pump maintains a higher pressure; each machine's MSRV regulates local working pressure according to its specific requirements. Solenoid control allows centralized monitoring and adjustment from a control room—simplifying maintenance and optimizing overall system efficiency.

Technical Advantages

• Two-Pressure Flexibility – Single valve replaces complex dual-relief valve arrangements

• Significant Energy Savings – Pump unloading capability reduces operating costs and heat generation

• Fast Electrical Response – Solenoid actuation enables millisecond-level pressure switching

• Manual Override Capability – Adjustment knob allows field calibration and fallback operation if electrical control fails

• Compact Modular Design – Eliminates external piping and multiple valve assemblies; integrates with standard ISO 4401/CETOP mounting patterns

• Versatile Coil Options – Available with various voltage ratings (12V DC, 24V DC, 110V AC, 220V AC) and connector styles (DIN, Deutsch, flying lead)

• Visual Status Indication – Optional LED-equipped connectors provide immediate confirmation of solenoid activation

Specifications

Operational Logic

Installation & System Design Benefits

• Reduced Component Count – One MSRV replaces separate relief valve, unloading valve, and directional valve assemblies

• Simplified Electrical Integration – Compatible with standard PLC outputs; no special drivers required

• Maintenance-Friendly – Cartridge-style internal components and accessible adjustment facilitate rapid field service

• System Diagnostics – Electrical feedback from solenoid circuit enables remote monitoring of valve status and fault detection

The MSRV Series Modular Solenoid Operated Relief Valve represents the convergence of hydraulic reliability and electronic control flexibility—delivering intelligent pressure management for modern, energy-conscious industrial hydraulic systems.