Counterbalance valve LCBIG LCBIH

Counterbalance valve LCBIG LCBIH

4 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

Working Principle

• Unidirectional Free Flow: Oil can flow freely fromPort ② (Inlet)toPort ① (Outlet)without additional control.

• Pressure Relief Control: When oil flows fromPort ①toPort ②, it operates via a direct-acting, pilot-assisted pressure relief function. The pressure atPort ③ (Pilot Control Port)reduces the effective setting of the relief valve by the pilot ratio, enabling precise load pressure control.

• Pilot Assistance: Pilot pressure introduced throughPort ③lowers the main relief valve's cracking pressure, allowing smooth valve response to load pressure variations.

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III. Technical Specifications

• Maximum Setting Pressure: 350 bar

• Maximum Recommended Load Pressure: 270 bar (at maximum setting pressure)

• Flow Characteristics: Refer to pressure-flow curves (specific curves available in the product manual).

• Internal Leakage: ≤5 drops/minute

• Pilot Ratios:

• LCBIG: 4.5:1

• LCBIH: 10:1

• Temperature Range: -40°C to +120°C

• Filtration Requirements: Mineral oil viscosity range: 7.4 to 420 cSt; standard filtration required.

• Cartridge Type: SUN T-19A

• Manifold Material:

• 6061-T6 Aluminum Alloy: Rated for 207 bar

• Steel and Ductile Iron: Rated for 350 bar

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IV. Applications

LCBIG/LCBIH counterbalance valves are widely used in hydraulic systems requiring overrunning load control, such as:

• Cranes: Preventing uncontrolled lowering of heavy loads due to gravity.

• Excavators: Controlling the descent speed of booms or buckets for smooth operation.

• Injection Molding Machines: Preventing rapid mold closure caused by gravity, protecting equipment and molds.

• Other Hydraulic Equipment: Including die-casting machines, lifting platforms, and other applications requiring load control.

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V. Installation and Commissioning

1. Mounting Orientation: Ensure correct valve orientation to avoid reverse oil flow.

2. Pilot Control: Adjust pilot pressure according to system requirements for optimal control.

3. Pressure Setting: The counterbalance valve's setting pressure should be at least 1.3 times the maximum load pressure to ensure a safety margin.

4. Backpressure Considerations: Backpressure atPort ②increases the relief valve's setting by a factor of "1 + pilot ratio." Account for this during commissioning.

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VI. Maintenance and Troubleshooting

• Regular Inspections: Check for leaks and ensurePort ③is not blocked.

• Seal Replacement: Replace seals if internal leakage increases due to aging.

• Filtration Maintenance: Ensure clean hydraulic oil to prevent contaminants from entering the valve and affecting performance.

• Common Faults:

• Excessive Load Descent Speed: May indicate insufficient pilot pressure or a low relief valve setting.

• Excessive System Pressure: Check for backpressure effects or a stuck relief valve.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

4 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch , hydraulic system

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