CBEA-LHN Sun Hydraulics Counterbalance Valve 120 L/min

Product Overview

The Sun Hydraulics CBEA-LHN is a standard counterbalance cartridge valve designed for hydraulic load holding, controlled load release and overrunning-load management.

Sun’s official documentation identifies CBEA-LHN as a T-2A cavity counterbalance valve with a 120 L/min nominal capacity and a 280 bar maximum setting. The CBEA configuration uses a 3:1 pilot ratio, while the L control denotes the standard screw adjustment. The standard adjustment range includes 70–280 bar and lower-pressure configurations are also available.

A counterbalance valve should not be confused with a conventional pressure relief valve. Its primary purpose is to control overrunning loads and maintain hydraulic actuator stability. When pilot pressure is applied, the valve can reduce the effective resistance to reverse flow, allowing the actuator to move under controlled conditions.

The original title also contains CSAZ-XXN and CDAD-XBN, but these are different Sun Hydraulics cartridge functions:

• CSAZ-XXN — single-ball shuttle valve
• CDAD-XBN — back-to-back check/shuttle valve

They should therefore be treated as related cartridge models rather than variants of CBEA-LHN.

For replacement applications, the correct selection sequence is:

Hydraulic Function → Cavity → Pilot Ratio → Setting Range → Check Configuration → Seal → Complete Model Code

Technical Specifications

CBEA-LHN

• Model: CBEA-LHN
• Brand: Sun Hydraulics
• Valve Type: Standard counterbalance valve
• Cavity: T-2A
• Nominal Capacity: 120 L/min
• Maximum Setting: 280 bar
• Recommended Maximum Load Pressure at Maximum Setting: 215 bar
• Pilot Ratio: 3:1
• Adjustment: L — Standard Screw
• Complete Adjustment: approx. 3¾ turns
• Pressure Range Options:
  • H: 70–280 bar
  • I: 25–105 bar
• Standard Factory Setting: 210 bar for A/H configurations; 70 bar for B/I configurations
• Check Spring Options: 2 bar or 0.3 bar depending on ordering configuration
• Seal: N — Buna-N
• Alternative Seal: Viton options available
• Installation Torque: 60–70 Nm
• Displacement: Not applicable
• Rated Speed: Not applicable
• Primary Function: Load holding and controlled release of overrunning hydraulic loads.

CSAZ-XXN

• Model: CSAZ-XXN
• Brand: Sun Hydraulics
• Valve Type: Single-ball shuttle valve
• Cavity: T-163A
• Nominal Capacity: 5 L/min
• Maximum Operating Pressure: 350 bar
• Control: X — Non-adjustable
• Signal: Z — Signal at Port 2
• Seal: Buna-N or Viton
• Installation Torque: 35–40 Nm
• Primary Function: Pressure-signal selection/shuttle logic
• Maximum Leakage: approx. 0.3 cc/min at 24 cSt.

CDAD-XBN

• Model: CDAD-XBN
• Brand: Sun Hydraulics
• Valve Type: Back-to-back check/shuttle valve
• Cavity: T-11A
• Nominal Capacity: 10 L/min
• Maximum Operating Pressure: 350 bar
• Control: X — Non-adjustable
• Signal: D — Signal at Port 2
• Check Spring: 1.0 bar
• Seal: N — Buna-N
• Installation Torque: 40–50 Nm
• Primary Function: Check/shuttle signal logic
• Maximum Leakage: approx. 0.4 cc/min
• Important Limitation: A trapped high-pressure signal cannot automatically bleed down through the back-to-back check arrangement.

Key Technical Advantages

3:1 Pilot-Ratio Load Control

CBEA-LHN uses a 3:1 pilot ratio, allowing pilot pressure to reduce the effective opening pressure during controlled load release. This is useful for hydraulic cylinders and motors operating with overrunning loads.

120 L/min Flow Capacity

With a 120 L/min nominal capacity, CBEA-LHN is positioned for medium- to high-flow actuator circuits and manifold applications.

Wide Adjustment Range

The CBEA family provides multiple pressure ranges, including 70–280 bar and lower-pressure configurations. This allows the valve to be matched more closely to the actual load-induced pressure of the hydraulic circuit.

Multi-Turn Mechanical Adjustment

The L control provides standard screw adjustment with approximately 3¾ turns, allowing engineers to fine-tune load holding and controlled lowering behavior.

T-2A Cartridge Integration

The T-2A cavity provides a standardized interface for integrating CBEA-LHN into hydraulic manifolds and modular cartridge-valve systems.

Regeneration-Circuit Compatibility

Sun’s pressure-sensitive regeneration documentation specifically uses CBEA-LHN as a 3:1 counterbalance component and identifies a 70–280 bar adjustment range.

Modular Cartridge Architecture

The cartridge design allows multiple hydraulic functions to be combined in compact valve manifolds, reducing external piping and simplifying hydraulic circuit integration.

Application Areas

CBEA-LHN

• Hydraulic cylinders
• Boom and arm circuits
• Lifting equipment
• Winches
• Hoists
• Material-handling machinery
• Construction equipment
• Controlled lowering circuits
• Overrunning-load control
• Pressure-sensitive regeneration systems

CSAZ-XXN

• Pressure-signal selection
• Shuttle circuits
• Hydraulic logic
• Load-sense signaling
• Compact manifold systems

CDAD-XBN

• Dual check/shuttle circuits
• Pressure-signal isolation
• Hydraulic logic
• Signal retention
• Manifold control circuits

The CDAD back-to-back check configuration should include a suitable bleed-off path because the valve can trap a high-pressure signal after both load-port pressures decrease.

Expert Maintenance Tips

Select the Counterbalance Setting From Actual Load Pressure

Sun recommends sizing the counterbalance setting relative to the maximum load-induced pressure rather than simply selecting the highest available pressure. The documented guidance is approximately 1.3× maximum load-induced pressure.

Analyze Pilot Ratio During Stability Problems

Sun offers multiple counterbalance pilot ratios, including 3:1, 1.5:1, 2:1, 2.3:1, 4.5:1 and 10:1. If the actuator oscillates or chatters, investigate pilot ratio, load pressure, flow and pilot-line restriction before assuming valve failure.

Respect the 215 bar Recommended Load Limit

For CBEA at its maximum 280 bar setting, Sun specifies a 215 bar maximum recommended load pressure. This value should be incorporated into hydraulic circuit analysis and is not simply interchangeable with the valve’s maximum setting.

Use the Correct Installation Torque

CBEA-LHN requires approximately 60–70 Nm installation torque. Incorrect torque can compromise sealing or cartridge operation.

Inspect the Pilot Circuit

Load drift, unstable lowering, cylinder chatter or delayed opening can result from pilot contamination, valve-seat wear, internal sticking or incorrect pilot pressure.

Inspect CSAZ Shuttle Components

CSAZ-XXN uses a single-ball shuttle arrangement and selects the pressure signal from Port 2. Contamination or seat wear can interfere with reliable signal selection. Sun highlights hardened steel balls and seats for wear and contamination resistance.

Provide a Bleed-Off Path for CDAD

The CDAD back-to-back check configuration can trap a high pressure signal. The hydraulic circuit should therefore provide an appropriate method for releasing the stored signal.

Do Not Interchange These Models by Appearance

The hydraulic functions are different:

CBEA-LHN → Counterbalance Valve

CSAZ-XXN → Single Ball Shuttle Valve

CDAD-XBN → Back-to-Back Check/Shuttle Valve

Matching cavity dimensions alone does not establish functional interchangeability.

Perform Dynamic Replacement Testing

For CBEA-LHN replacement units, test:

Load Pressure → Pilot Pressure → Valve Opening → Controlled Lowering → Reseat

Measure:

• Setting pressure
• Pilot-opening response
• Load-release stability
• Flow response
• Leakage
• Pressure override
• Repeated-cycle performance

Use 100% Simulated Working-Condition Testing

A representative factory test can reproduce:

Hydraulic Power Unit → CBEA-LHN → Cylinder/Motor Load Simulator → Pilot Circuit

Test conditions should include static load holding, increasing load, pilot-pressure control, controlled lowering, sudden load changes, reseating and repeated pressure cycling.

This provides a stronger technical basis for in-place interchangeability and 100% simulated working-condition testing than dimensional inspection alone.