HAWE LHK Series Balance Valve | LHK33 G-14-180 | LHK22 G-21-180 | Load Holding Valve

The LHK Series balance valves by Chengyuan Hydraulic are high-reliability load-holding components engineered to be fully compatible with HAWE technical standards. Covering models like LHK33 G-14-180 and LHK 22 G-21-180/180, these valves are primarily used to control the descent speed of actuators (cylinders or motors) in the return direction, preventing uncontrolled load drops. The core advantage is the integrated pressure compensation, ensuring a smooth, vibration-free lowering process. Offering 100% original-place interchangeability and having passed 100% simulated condition testing, these valves exhibit zero-leakage performance even under extreme pressures.

Technical Specifications :

• Core Models: LHK 22, LHK 33, LHK 44

• Max Operating Pressure: $40\text{ MPa (400 bar / 5800 psi)}$

• Max Flow Rate: $LHK 22 (20\text{ L/min}), LHK 33 (60\text{ L/min}), LHK 44 (100\text{ L/min})$

• Pilot Ratio: Standard 1:4.6 (others available)

• Pressure Settings: E.g., 180 bar (Code 14-180 defines adjustment range and preset)

• Connection Type: Manifold or Pipe mounting (G thread)

• Functional Design: Single or double-acting control with opening buffer and pressure compensation

• Temperature Range: $-40\text{°C}$ to $+80\text{°C}$

Key Technical Advantages:

• Zero-Leakage Poppet Design: Featuring a high-strength ball or cone-seat sealing mechanism with precision-lapped seats. This ensures zero cylinder drift even when loads are suspended for extended periods.

• Integrated Opening Buffer: The internal damping design absorbs pressure spikes during the initial pilot signal. This allows for an extremely smooth transition from static to motion, eliminating the “low-frequency judder” common in mobile machinery.

• Pressure Compensation Characteristics: The valve’s performance remains unaffected by back-pressure fluctuations. When multiple actuators operate simultaneously, the LHK maintains the preset descent speed, ensuring precise control.

• Extreme Environment Resilience: The valve bodies are galvanized or thermochemically treated for superior corrosion resistance. Perfectly suited for aerial platforms and mining operations exposed to salt spray and sub-zero temperatures.

Application Areas:

• Lifting Equipment: Load protection for truck-mounted cranes and telescoping cylinders.

• Aerial Work Platforms: Smooth descent control for scissor lifts or articulated boom lifts.

• Forestry Machinery: Load holding for grapples and harvester heads.

Expert Maintenance Tips:

• Setting Protocol: The balance valve should be set to at least 1.3 times the maximum induced load pressure. For example, if the max load pressure is 100 bar, set the valve to 130 bar.

• Pilot Line Filtration: Pilot ports are sensitive to debris. Ensure high-precision filtration on the return side to prevent the pilot orifice from clogging, which could cause the valve to fail to open.

• Static Verification: Conduct a static test in a safe area every six months to verify the valve’s holding capability and check for any slow load drifting.