BST-06 Solenoid Relief Valve Yuken 31.5MPa 250L/min

Product Overview

Engineered for demanding industrial high-pressure environments, the BST / BSG Series Solenoid Controlled Relief Valves combine pilot-operated pressure relief and solenoid directional control into a single integrated hydraulic component. Designed to strict Yuken OEM standards, these valves guarantee 100% physical and hydraulic interchangeability with original units. They provide precise system pressure regulation and effortless low-pressure unloading via electric signals. Every valve undergoes 100% simulated operating condition testing prior to shipment to ensure zero leakage, high dynamic responsiveness, and long-term operating reliability under maximum load cycles.

Technical Specifications

• Model Designation: BST / BSG Series (Representative P/N: BST-03, BSG-06, BSG-10, BST-06-2B3B-D24-N-4780, BST-06-V-2B3B-D24-N-48)

• Nominal Valve Size: Size 03 (3/8″, DN10) / Size 06 (3/4″, DN20) / Size 10 (1-1/4″, DN32)

• Maximum Flow Rate: Size 03: 100 L/min | Size 06: 250 L/min | Size 10: 400 L/min

• Maximum Operating Pressure: 31.5 MPa (315 bar / 4500 PSI)

• Pressure Adjustment Range: 0.7 – 31.5 MPa

• Solenoid Coil Voltage Options: DC 24V (D24) / AC 110V / AC 220V with DIN 43650 connector and LED indicator

• Mounting Interface: BST Series: Threaded In-Line Connection (G / NPT ports); BSG Series: ISO 6264 Sub-plate Flange Mounting

• Fluid Compatibility: Mineral-based hydraulic fluids (Viscosity: 15 – 400 mm²/s)

• Fluid Temperature Range: -15°C to +70°C (+5°F to +158°F)

• Oil Cleanliness Requirement: ISO 4406 Code 19/16/13 (Recommended filtration rating ≤ 10 µm)

• Unit Weight: BST-06 approx. 6.8 kg / BSG-06 approx. 7.2 kg

Key Technical Advantages

• 100% Direct Drop-in Interchangeability: Precision CNC lathe machining and sub-micron centerless grinding guarantee identical mounting dimensions and internal flow characteristics compared to standard Yuken valves.

• Low Hydraulic Shock & Optimized Damping: Precision-engineered pilot orifices control spool acceleration, significantly mitigating water hammer effect, mechanical vibration, and noise during high-pressure unloading transitions.

• 100% Simulated Full-Load Factory Testing: Each individual valve is rigorously validated on dynamic test benches at full rated pressure (31.5 MPa) and rated flow, preventing premature field failure or internal leakage.

• Heavy-Duty Materials & Premium Sealing: Heat-treated alloy steel spools (HRC 58-62) paired with standard Viton (FKM) fluorocarbon seals deliver high heat resistance, anti-cavitation durability, and minimal wear under high-frequency operation.

Application Areas

• Plastic Injection Molding Equipment: Ensures accurate system pressure hold and quick depressurization during clamping cycles.

• Hydraulic Presses & Metal Stamping Machine Tools: Provides overpressure protection and smooth low-load startup for high-tonnage cylinder circuits.

• Metallurgical Steel Mills & Mining Machinery: Delivers robust performance under harsh, continuous-duty operating conditions with vibration and temperature swings.

• Mobile Machinery & Heavy Industrial Power Units: Integrates seamlessly into centralized high-flow manifold systems.

Expert Maintenance Tips

• Sub-plate Mounting Precision: For BSG sub-plate models, confirm the manifold mounting surface flatness is within 0.01 mm per 100 mm. Cross-torque Class 12.9 mounting bolts uniformly to 25–30 Nm.

• Fluid Contamination Management: Fluid contamination is the leading cause of pilot orifice blockages and spool sticking. Maintain clean oil using a high-pressure inline filter rated at 10 µm or finer.

• Solenoid Coil Inspection: Ensure the DIN plug gasket (IP65) is seated properly to prevent coolant or humidity intrusion. Maintain DC 24V supply voltage within ±10% of nominal rating to prevent coil overheating.