LHDV33P-15-M6-400/440 HAWE Load Holding Valve 420bar

Product Overview

The HAWE LHDV33P series load-holding valve (typical model LHDV33P-15-M6-400/440) is an over-center/counterbalance valve specifically designed for use with proportional directional control valves. It features special damping characteristics and zero-leakage sealing. Maximum setting pressure 420 bar, maximum flow 80 L/min. Adjustable bypass orifices and pilot ratios effectively suppress vibration and shock during load lowering, making it ideal for combination with PSL/PSV proportional valves. Available in manifold or pipe-mounted versions and highly interchangeable with original HAWE systems. Every unit undergoes rigorous simulated duty-cycle testing for safe and reliable performance in load-sensitive applications.

Technical Specifications 

• Model: LHDV33P-15-M6-400/440 (LHDV 33 series)
• Type: Load-holding valve (over-center/counterbalance) with special damping and bypass check valve
• Maximum Flow: 80 L/min
• Maximum Setting Pressure: 420 bar
• Pressure Setting Range (example): Approx. 351–420 bar (L/M/N/P coding)
• Pilot Ratio: Approx. 1:2.9 (standard coding 6)
• Permissible Return Pressure: Max. approx. 10 bar
• Mounting: Manifold mounting (P-15 with shock valve)
• Weight: Approx. 1.8 kg (P-15 version)
• Leakage: Zero leakage (cone-seat design)
• Fluid: Mineral-oil based hydraulic fluid (DIN 51524)

Key Technical Advantages

1. Special damping characteristics: More finely adjustable damping than conventional load-holding valves, effectively suppressing vibration and shock for improved system stability.
2. Zero-leakage cone-seat design: Reliable load locking with no leakage under sustained pressure, enhancing safety.
3. Drop-in interchangeability and flexible configuration: Standard interfaces compatible with original HAWE LHDV series; multiple pilot ratios, shock valves and twin-valve options available.
4. High-pressure capability and proven reliability: Rated to 420 bar, precision manufacturing and 100% duty-cycle testing ensure durability in demanding crane and construction applications.

Application Areas

• Cranes, telescopic booms and lifting equipment for load holding and controlled lowering
• Construction machinery (excavators, loaders) working attachments requiring safe locking
• Mobile hydraulic systems combined with HAWE PSL/PSV proportional directional valves
• Specialty lifting devices needing precise damping and zero-leakage pressure holding

Expert Maintenance Tips

Verify interface flatness and seals before installation; maintain fluid cleanliness at ISO 4406 20/18/15 or better. Adjust pressure settings only with proper tools according to the manual to avoid over-adjustment. Periodically inspect damping orifices and bypass check valves for blockage. Do not exceed permissible return pressure. Prefer identical pilot-ratio and pressure-range units for replacement to maintain damping characteristics. Perform system bleeding and functional testing after service to confirm reliable load locking.