Counterbalance valve LRPEE

Counterbalance valve LRPEE

4 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

I. Core Functions of Counterbalance Valves

Counterbalance valves are critical components in hydraulic systems designed to control loads and prevent uncontrolled movement caused by gravity or external forces. Their key functions include:

1. Load Control

• By generating backpressure, counterbalance valves ensure smooth motion of hydraulic cylinders or motors driving loads, preventing sudden acceleration during descent.

• Example: In crane boom lowering, the valve prevents abrupt load drops, protecting equipment and personnel.

2. Safety Locking

• When system pressure is lost (e.g., due to a solenoid valve in neutral position or hose rupture), the valve automatically closes, stopping hydraulic fluid from draining from the cylinder and preventing load movement.

• Typical Applications: Hydraulic lifting platforms, boom mechanisms in construction machinery.

3. Pressure Compensation

• Some models adjust the throttle orifice area automatically in response to load pressure changes, maintaining stable flow and consistent system performance.

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II. Working Principle of Counterbalance Valves

1. Structural Components

• A counterbalance valve typically consists of a main spool, check valve spool, and pressure-regulating spring.

• The main spool controls fluid flow direction and volume, the check valve spool allows one-way flow, and the spring sets the valve’s opening pressure.

2. Operational Process

• Load Ascent Phase: Hydraulic fluid enters the cylinder’s rod chamber via the check valve, driving the load upward. The check valve closes under light spring force to prevent backflow.

• Load Descent Phase: Fluid flows from the rod chamber to the tank through the main spool. If descent speed exceeds limits, reduced port pressure triggers the main spool to close, slowing or stopping movement.

• No Supply Pressure: Both the main spool and check valve remain closed, preventing fluid loss and maintaining load stability.

3. Key Parameters

• Setting Pressure: Must exceed1.3× maximum load pilot pressureto ensure proper valve resetting.

• Spring Stiffness: Affects response speed and stability; selected based on load characteristics.

• Drain Type:

• Internal Drain: Simple structure but susceptible to backpressure.

• External Drain: Uses a dedicated drain port for enhanced stability.

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III. Model Naming Logic (LRPEE/LRPGE Example)

1. Manufacturer-Specific Codes

• LRPEEandLRPGElikely represent model variants designed to differentiate functional or performance characteristics.

• Example: The letter "E" may denoteExternal Drain, while "G" could indicateHigh-Pressurecapability or specialized sealing materials (e.g., Viton).

2. Functional Differences

• IfLRPEEis a standard model,LRPGEmay offer enhanced features such as:

• High-Pressure Tolerance: Suitable for systems with elevated pressure ratings.

• Contamination Resistance: Special spool designs or filtration for harsh operating conditions.

• Integrated Sensors: Built-in pressure/flow sensors for real-time monitoring and feedback control.

3. Selection Guidelines

• Define Application Requirements: Choose based on load weight, motion speed, and system pressure.

• Consult Technical Documentation: Obtain detailed specifications for LRPEE/LRPGE from the manufacturer.

• Verify Installation Compatibility: Ensure the model fits the mounting space on the hydraulic cylinder’s mini-valve block.

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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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