SRVG Series Solenoid Operated Relief Valves & RVG Series Pilot Operated Relief Valves
Product Description
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
Programmable Pressure Relief: Electrical activation enables remote, automated pressure control synchronized with machine cycles and process requirements
Multi-Stage Pressure Management: Multiple solenoids and/or manual adjusters allow switching between distinct pressure settings for versatile machine operation modes
System Unloading & Energy Management: Solenoid-controlled unloading reduces pump power consumption and heat generation during idle or low-demand periods
Safety Interlocking & Emergency Control: Integration with safety PLCs and emergency stop circuits for fail-safe hydraulic system management
Comprehensive Overpressure Protection: Reliable safeguarding of pumps, cylinders, motors, and system components from damaging pressure spikes
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)