Yuken BSG/BST Series Solenoid Relief Valve Replacement | High-Pressure Hydraulic Valve

Genlu Hydraulic proudly introduces our industrial-grade BSG/BST Series solenoid-controlled relief valves. This series is fully engineered to match global standards, providing a seamless, high-value drop-in replacement for Yuken original equipment, covering the complete 03, 06, and 10 frame sizes. We specifically highlight our supply capability for precision-tuned units such as the S-BSG-06-2B3B-A220-N-L-10.

Acting as the “safety guardian” of fluid power, the BSG/BST series combines remote pressure regulation with high-speed solenoid-actuated unloading. Genlu guarantees 100% Drop-in Interchangeability across mounting interfaces, spring rates, solenoid logic, and internal pilot-spool configurations compared to original Yuken assemblies. Every valve undergoes 100% full-load stability and response-time verification on our digital test benches, certifying elite pressure stability and safe, responsive unloading protection for your critical hydraulic systems.

Technical Specifications 

• Product Series: Yuken BSG / BST Series Solenoid Relief Valve

• Representative Models: S-BSG-06-2B3B-A220-N-L-10, BSG/BST-03, 06, 10

• Port Sizes: 3/8″ (03), 3/4″ (06), 1-1/4″ (10)

• Maximum Operating Pressure: 250 bar

• Nominal Flow Capacity: Up to 400 L/min (Size-dependent)

• Coil Voltage: AC220V, DC24V (Options available)

• Pressure Adjustment Range: 5 – 250 bar

• Mounting Configuration: Sub-plate Mounting

• Compatible Hydraulic Fluids: ISO-standard mineral-based oils

Key Technical Advantages:

• Integrated Control Logic: Combines remote pressure-relief and solenoid-unloading into a single package, simplifying manifold designs, reducing external plumbing, and minimizing potential leak paths.

• High-Precision Pilot Control: Features a precision-tuned pilot-operated stage that enables smooth pressure regulation, effectively eliminating chatter and pressure spikes during opening/closing phases.

• Wide Adjustment Stability: The spring-chamber geometry is CFD-optimized to ensure linear pressure-adjustment curves across the full range, mitigating the vibration issues commonly found in standard relief valves.

• Responsive Solenoid Unloading: Optimized armature-to-spool clearance ensures millisecond-level pressure relief upon receiving an unloading command, maximizing system energy efficiency during idle cycles.

Application Areas:

• Industrial Hydraulic Stations: Pressure protection for injection molding, die-casting, and metal-forming presses.

• Unloading Circuits: Systems requiring segmented pressure control or remote emergency-unloading capabilities.

• Construction Machinery: Safety-critical pressure limitation and unloading control for hydraulic lifting/transport equipment.

Expert Maintenance Tips:

• Avoid Forced Pressure Adjustment: Always loosen the locknut before adjusting the pressure handwheel. Attempting to adjust pressure under locking torque will permanently damage the adjustment-stem threads.

• Monitor Case/External Drain Lines: For BST models, keep external drain lines free from backpressure. Any restriction in the drain circuit will result in uncontrolled set-pressure drift and potential system over-pressurization.

• Implement Scheduled Maintenance: The internal orifice is sensitive to sludge and metallic debris. Inspect and clean the pilot orifice every 6 months and ensure the system is purged of air during initial startup to prevent pressure jitter.