SRVG Series Solenoid Operated Relief Valves & RVG Series Pilot Operated Relief Valves

Overview

The SRVG series is a high-performance pilot-operated solenoid relief valve designed for sophisticated pressure control and system protection in modern hydraulic applications. This versatile valve integrates a robust main-stage relief valve with an advanced solenoid-operated pilot control system, offering seamless electro-hydraulic integration for industrial automation. Available in single and dual solenoid configurations, the SRVG series features precision manual adjustment, multiple pressure setting options, and standardized mounting interfaces to accommodate diverse system requirements from simple unloading to complex multi-pressure control scenarios.

Key Features

• Pilot-Operated Two-Stage Architecture: Delivers stable, precise pressure regulation with minimal pressure override across wide flow ranges

• Flexible Solenoid Configurations: Available with single or dual solenoid options for multi-pressure selection and advanced control logic

• Multi-Pressure Setting Capability: Models with multiple manual adjusters allow pre-setting of several pressure levels for versatile operation

• Electro-Hydraulic Integration: Standardized DIN electrical connectors enable direct PLC and automation system connectivity

• High-Flow Capacity: Optimized main stage geometry handles substantial system flows while maintaining precise control characteristics

• Modular Mounting Design: Subplate mounting configuration compatible with ISO standards and industry-common manifold systems

• Visual Status Indication: Transparent solenoid housings with LED indicators provide clear operational status feedback

• Robust Construction: Durable cast iron or steel body with corrosion-resistant finish for extended service life in demanding environments

Primary Functions

1. Programmable Pressure Relief: Electrical activation enables remote, automated pressure control synchronized with machine cycles and process requirements

2. Multi-Stage Pressure Management: Multiple solenoids and/or manual adjusters allow switching between distinct pressure settings for versatile machine operation modes

3. System Unloading & Energy Management: Solenoid-controlled unloading reduces pump power consumption and heat generation during idle or low-demand periods

4. Safety Interlocking & Emergency Control: Integration with safety PLCs and emergency stop circuits for fail-safe hydraulic system management

5. Comprehensive Overpressure Protection: Reliable safeguarding of pumps, cylinders, motors, and system components from damaging pressure spikes

6. Bi-Functional Operation: Serves as both conventional relief valve (manual mode) and electrically controlled relief/unloading valve (solenoid mode)

Detailed Application Scenarios

Advanced Industrial Manufacturing

• CNC Machining Centers: Automated hydraulic clamping and workholding systems requiring pressure coordination with spindle operations, tool changes, and machining cycles; the SRVG enables energy-saving pump unloading during program pauses and tool changes

• Plastic Injection Molding Machines: Multi-stage pressure profiles for clamp force optimization—different pressures for mold closing, high-pressure clamping, injection, and plasticizing phases, all synchronized with the machine controller via electrical signals

• Die Casting & Metal Forming: High-pressure locking cylinder control with automated pressure reduction during die opening and safety interlocking with ejector systems; multi-pressure models accommodate varying tonnage requirements

• Automated Assembly Systems: Programmable pressure control for pressing, staking, and joining operations with real-time force feedback integration and quality monitoring

• Rubber & Tire Manufacturing: Curing press applications requiring precise temperature-pressure coordination and automated cycle control with multiple pressure stages

Smart Mobile & Construction Equipment

• Electronically Controlled Excavators: Integration with machine ECUs for automated boom/arm pressure management, anti-drift compensation, and fuel-efficient pump unloading during operator idle time; multi-pressure models support different work modes (digging, lifting, precision work)

• Precision Agriculture Machinery: ISOBUS-compatible tractors and self-propelled harvesters utilizing SRVG valves for implement hydraulic management based on GPS data, crop conditions, and load sensing

• Modern Material Handling: Automated warehouses and distribution centers employing AGVs and robotic forklifts with synchronized hydraulic pressure control for lifting, tilting, and stability functions

• Tunnel Boring & Mining Equipment: Remote-controlled hydraulic systems requiring precise, electrically managed pressure for cutter head positioning, thrust control, and conveyor tensioning

Energy-Efficient Hydraulic Systems

• Variable Displacement Pump Circuits: The SRVG provides electrically commanded unloading for maximum energy savings in systems with intermittent duty cycles

• Accumulator-Based Power Systems: Automated charging/discharging cycles with electrical control of accumulator isolation and pressure maintenance

• Servo-Hydraulic Test Equipment: Dynamic pressure control in structural test rigs, materials testing machines, and component durability test stands requiring real-time electrical adjustment and multiple test pressure profiles

• Green Manufacturing Initiatives: Hydraulic power units designed for reduced carbon footprint through intelligent pump unloading and demand-based pressure generation

Process Industry & Heavy Infrastructure

• Steel & Aluminum Production: Continuous casting, rolling mill, and extrusion press hydraulics requiring precise pressure coordination with process automation systems; multi-pressure models support different product grades and thicknesses

• Pulp & Paper Processing: Calendar stack control, winding operations, and roller positioning systems integrated with distributed control systems (DCS)

• Cement & Mining Operations: Kiln drive hydraulics, crusher gap adjustment, and conveyor tensioning with remote monitoring and control capabilities

• Water Treatment & Dam Management: Gate control systems, valve actuators, and flood management hydraulics requiring reliable long-term operation with SCADA integration

Specialized & High-Value Applications

• Aerospace Ground Support: Aircraft hydraulic test stands, jack systems, and maintenance equipment requiring precise, certifiable pressure control with multiple test configurations

• Defense & Military Systems: Ruggedized hydraulic controls for tactical vehicles, weapons platforms, and support equipment with electromagnetic compatibility (EMC) compliance

• Medical & Pharmaceutical Manufacturing: Clean-room compatible hydraulic systems for tablet presses, packaging equipment, and sterile processing with precise pressure validation

• Renewable Energy: Wind turbine hydraulic pitch control secondary systems, solar tracking mechanisms, and hydroelectric gate controls with grid-integration requirements

Technical Advantages

The SRVG series delivers exceptional performance through its sophisticated design:

• Superior Pressure Stability: Pilot-operated architecture maintains consistent relief pressure with minimal override (typically <5% across rated flow range), ensuring process repeatability and product quality

• Smooth Dynamic Response: Engineered damping prevents pressure oscillations and system instability during rapid flow transients

• Flexible Control Architecture:

  • Single solenoid models: On/off unloading or two-pressure selection

  • Dual solenoid models: Three-pressure selection (manual/low/medium/high) or complex logic control

  • Multi-adjuster models: Pre-configured pressure profiles for quick mode switching

• Fail-Safe Configurability: Available as normally closed (relieves when energized) or normally open (unloads when energized) to match system safety requirements

• Electrical Standardization: Industry-standard DIN 43650 connectors with optional LED indicators, surge protection, and various voltage configurations (12V DC, 24V DC, 110V AC, 220V AC)

• Energy Optimization: Electrical unloading capability typically reduces pump power consumption by 70-90% during idle periods compared to continuous pressure relief

• Diagnostic Integration: Optional position switches or pressure transducer interfaces enable condition monitoring and predictive maintenance strategies

Installation & System Integration

• Hydraulic Mounting: Standard subplate interface per ISO 4401 or manufacturer-specific patterns; flange-mounted base ensures mechanical stability under high-flow conditions

• Electrical Connection: DIN 43650 Form A connector standard; verify coil voltage, wattage, and duty cycle compatibility with control system specifications

• Pilot Circuit Requirements: Maintain ISO 4406 cleanliness level 18/16/13 or better in pilot stage fluid; dedicated filtration recommended for high-reliability applications

• Tank Line Engineering: Size tank lines to prevent backpressure exceeding 5% of relief setting; independent tank returns preferred for multi-valve installations

• Adjustment Procedure: Set manual override(s) to desired pressure levels; use solenoid control for operational pressure selection and unloading functions

Operational Configurations

Single Solenoid + Single Adjuster Model:

• De-energized: Functions as standard pilot-operated relief valve at manually set pressure

• Energized: System unloading (pump flow to tank at minimal pressure) or alternative pressure setting

Dual Solenoid + Dual Adjuster Model:

• Both de-energized: Manual pressure setting active

• Solenoid A energized: Pressure Setting 1 (e.g., high pressure for working mode)

• Solenoid B energized: Pressure Setting 2 (e.g., medium pressure for standby)

• Both energized: Typically highest pressure setting or system-defined logic

Multi-Adjuster Configuration (Three Manual Adjusters):

• Enables pre-setting of three distinct pressure levels

• Solenoid selection switches between pre-configured pressures

• Ideal for machines with multiple operating modes (e.g., forming, trimming, ejection in stamping presses)