HAWE LHK Series Load Holding Valve | LHK40 LHK33 Counterbalance Valve | LHK40F-11CPV

The LHK Series load-holding and counterbalance valves from Chengyuan Hydraulic are high-performance safety components fully compatible with HAWE standards. Designed to prevent uncontrolled movement or overspeeding of actuators in the direction of the load, this series integrates check valve, relief valve, and vibration damping functions. For core models such as LHK 40 F-11CPV-PYD-160 and LHK 33 G-21-250/250, we utilize hardened alloy steel spools to ensure zero-leakage performance (poppet-style sealing) in the closed position. Every valve undergoes 100% simulated full-load holding testing before shipment to guarantee pressure sensitivity parity with the OEM, ensuring 100% original-place interchangeability.

Technical Specifications :

• Series Model: HAWE LHK Series (LHK 33 / LHK 40)

• Max Operating Pressure: 400 bar (40 MPa)

• Max Flow Rate: 60 L/min (LHK 33) / 100 L/min (LHK 40)

• Pilot Ratio: 1:4.6 (Standard) or customized per model suffix

• Control Characteristics: Integrated hydraulic damping and stroke limitation to prevent oscillation

• Drain Type: Internal drain (Backpressure affects pilot pressure)

• Sealing Type: Hardened poppet seal (Static zero-leakage)

• Temperature Range: $-40°C$ to $+80°C$

• Porting: Threaded (G 1/2, G 3/4) or Manifold mounting

Key Technical Advantages:

• Superior Anti-Vibration Control: The LHK valve features an integrated micro-damping orifice that absorbs system pressure surges. This effectively eliminates the “judder” effect during large load lowering, ensuring smooth and stable operation.

• Hardened Poppet Sealing Technology: The spool and seat are precision-lapped to achieve a seal far superior to standard spool valves. This ensures near-zero displacement of actuators (like cylinders) under prolonged load, providing maximum operational safety.

• High Pressure Sensitivity: Designed with a precise pilot ratio, it responds instantly to pilot pressure changes. Even in micro-movement conditions, it provides micron-level speed regulation by accurately controlling return flow.

• Robust Contamination Tolerance: The HAWE-style construction offers excellent resistance to hydraulic fluid impurities, reducing the risk of spool sticking and lowering failure rates in harsh outdoor construction environments.

Application Areas:

• Mobile Cranes: Load holding and lowering balance for luffing cylinders and winch motors.

• Aerial Work Platforms: Emergency lowering protection for scissor and boom lifts.

• Concrete Pump Trucks: Position locking for placing boom hydraulic systems.

• Drilling Rigs: Feed speed control for rotary head systems.

Expert Maintenance Tips:

• Pressure Setting Standards: The relief opening pressure must be set to at least 1.3 times the load pressure. Never set the relief pressure too low, as it may cause unintended load drifting.

• Backpressure Management: The opening pressure of the LHK valve is affected by backpressure at the return port. Ensure a clear return path to avoid pilot malfunction due to high backpressure.

• Damping Optimization: If oscillation occurs in specific systems, the response characteristics can be optimized by fine-tuning the damping orifice (optional accessory).