1. Core Difference: Mounting Method

2. Shared Performance & Features

Key Specifications (Typical Yuken/CML)

• Max operating pressure: 25 MPa (3,630 psi)
• Max flow rate: Up to 400 L/min (106 gpm)
• Pressure adjustment range: 0.5-25 MPa (varies by model)
• Body material: Cast iron or ductile iron
• Seals: Nitrile rubber (standard), Viton (optional)

Functional Advantages

• Pilot-operated design: Small pilot valve controls large main valve for stable pressure regulation and low noise
• Remote control capability: Vent circuit enables remote pressure adjustment and system unloading
• Shock mitigation: Gradual pressure reduction during unloading prevents system shock
• High flow handling: Efficiently manages large flow rates with minimal pressure fluctuation

3. Working Principle

1. System pressure acts on both pilot valve and main valve via damping orifice
2. When pressure reaches pilot valve setting, pilot valve opens, creating flow through damping orifice
3. Pressure difference across main valve overcomes main spring force, opening main valve for large-flow relief
4. Main valve closes when system pressure drops below set point

4. Model Number Breakdown (Example: BT-03-P-V-32)

5. Applications

• Hydraulic system protection: Prevent overpressure damage to pumps, valves, and actuators
• Pressure regulation: Maintain constant pressure in hydraulic circuits
• Unloading function: Enable pump unloading via remote control for energy savings
• Remote pressure control: Adjust system pressure from a distance using auxiliary pilot valves
• Common industries: Construction machinery, industrial presses, plastic injection molding, machine tools, agricultural equipment

6. Selection Guide

• You need rigid, leak-free installation for high-vibration environments
• Multiple valves need to be mounted on a common manifold
• System requires easy maintenance and valve replacement

• Space is limited and a compact installation is needed
• You prefer simpler, direct connection without mounting plates
• Lower installation cost is a priority

7. Maintenance Tips

1. Regularly check for leaks at connections (BG: mounting surface; BT: thread seal)
2. Clean or replace filter elements to prevent contamination damage
3. Periodically verify pressure setting accuracy with a calibrated pressure gauge
4. Use only manufacturer-recommended seal materials for compatibility
5. Follow proper torque specifications for BG mounting bolts or BT thread connections