Product Overview

The Sun Hydraulics CBCA-LAN is a 3-port pilot-assisted counterbalance cartridge valve designed for load holding, overrunning-load control and controlled actuator movement.

Sun’s counterbalance architecture combines a check function with a direct-acting, pilot-assisted relief function. Free flow is permitted in one direction, while reverse load-side flow is controlled through the relief section. Pilot pressure at Port 3 reduces the effective relief setting according to the selected pilot ratio.

CBCA-LAN is a Series 1, T-11A standard counterbalance valve with a 3:1 pilot ratio and 60 L/min / 15 GPM nominal capacity. Its maximum setting is 280 bar / 4000 psi.

This makes it suitable for hydraulic cylinders, motors and mobile-equipment actuators exposed to gravity or overrunning loads.

Technical Specifications

CBCA-LAN

• Manufacturer: Sun Hydraulics
• Product Type: 3-port pilot-assisted counterbalance cartridge valve
• Series: Series 1
• Cavity: T-11A
• Nominal Capacity: 60 L/min / 15 GPM
• Pilot Ratio: 3:1
• Maximum Setting: 280 bar / 4000 psi
• Maximum Recommended Load Pressure at Maximum Setting: 215 bar
• Adjustment Range: 70–280 bar
• Standard Factory Setting: 210 bar
• Standard Check Cracking Pressure: 1.7 bar / 25 psi
• Factory Setting Test Flow: 30 cc/min
• Maximum Valve Leakage at Reseat: 0.4 cc/min
• Reseat: >85% of setting when standard set
• Adjustment: Standard screw, approximately 3¾ turns
• Valve Hex: 7/8 in / 22.2 mm
• Adjustment Screw Hex: 5/32 in / 4 mm
• Locknut Hex: 9/16 in / 15 mm
• Valve Installation Torque: 41–47 Nm
• Locknut Torque: 9–10 Nm
• Model Weight: 0.20 kg / 0.40 lb
• Seal: Buna-N
• Pump Displacement: Not applicable
• Pump Rated Pressure: Not applicable
• Pump Peak Pressure: Not applicable
• Maximum Pump Speed: Not applicable
• Control Method: Hydraulic pilot-assisted counterbalance control

How the CBCA-LAN Works

The basic operating sequence is:

Free Flow → Load Holding → Pilot-Assisted Opening

When flow moves through the free-flow direction, the check section opens.

When the actuator attempts to move in the reverse direction under load, the check closes and the relief section controls the load-side flow.

Pilot pressure applied at Port 3 reduces the effective relief setting and permits controlled reverse flow.

This provides:

Load Holding + Overrunning Load Control + Controlled Movement

rather than simple one-way check-valve behavior.

Key Technical Advantages

1. 3:1 Pilot Ratio

The 3:1 pilot ratio creates a defined relationship between pilot pressure and the effective counterbalance setting.

Sun also documents that back pressure at Port 2 increases the effective relief setting according to the pilot ratio.

This relationship must be included in hydraulic circuit design.

2. 60 L/min Standard Capacity

CBCA-LAN is a Series 1, 60 L/min counterbalance cartridge.

This capacity is well suited to:

• Boom cylinders
• Lift cylinders
• Telescopic cylinders
• Mobile hydraulic actuators
• Material-handling equipment

Sun’s official counterbalance reference identifies the Series 1 standard CBCA family at 60 L/min.

3. Low Reseat Leakage

Sun specifies 0.4 cc/min maximum valve leakage at reseat and more than 85% reseat pressure when the valve is standard set.

This supports reliable static load holding in properly designed hydraulic circuits.

4. Floating Cartridge Construction

Sun uses floating-style construction to minimize internal binding caused by excessive installation torque or variation between cartridge and cavity machining.

This is particularly valuable for field replacement and manifold-integrated applications.

5. T-11A Cartridge Integration

The CBCA-LAN uses a T-11A cavity.

This allows direct integration into compatible:

• Hydraulic manifolds
• Actuator housings
• Compact motion-control blocks

Sun notes that direct cartridge installation can improve protection and circuit stiffness while reducing external plumbing.

6. Standard 1.7 bar Check Cracking Pressure

The standard CBCA-LAN uses a 1.7 bar / 25 psi check spring.

Sun recommends the 1.7 bar check for normal applications and suggests the lower check option when actuator cavitation is a concern.

Related Models in the Original Search Term

The original keyword set contains several technically different Sun cartridge valves.

CBBL-LJN

CBBL-LJN is a semi-restrictive counterbalance valve.

Its verified family characteristics include:

• T-11A
• 40 L/min
• 2.3:1 pilot ratio
• Up to 350 bar setting

It is therefore not parameter-equivalent to CBCA-LAN.

CXED-XAN

CXED-XAN is a two-port side-to-nose free-flow check valve, not a counterbalance valve.

Verified characteristics include:

• T-5A
• 120 L/min
• 350 bar
• Maximum leakage 0.07 cc/min

Its primary function is simply:

Free Flow One Direction + Blocking in the Opposite Direction

PVFA-LAN

PVFA-LAN is a pilot-operated pressure reducing/relieving valve.

Its documented configuration includes:

• T-22A
• 80 L/min
• 350 bar maximum operating pressure
• External drain
• Reducing and relieving functions

Its purpose is different from CBCA-LAN:

PVFA → Pressure Reduction + Relief

CBCA → Load Holding + Overrunning Load Control

NCEB-LAN

NCEB-LAN is an adjustable needle valve with reverse free-flow check.

It belongs to the T-5A flow-control family and is rated at approximately 45 L/min, with a 350 bar maximum operating pressure in the documented configuration.

NFDD-LGN

NFDD-LGN is a fully adjustable high-capacity needle valve.

The documented configuration uses:

• 0.5 in / 12.7 mm maximum orifice
• Buna-N or Viton options
• Standard screw / handknob options
• Approx. 0.29 kg model weight

Its primary purpose is flow adjustment, not load holding.

Engineering Materials and Manufacturing

For CBCA-LAN, publicly available Sun documentation confirms:

• Buna-N sealing configuration
• Standard material/coating configuration
• Floating-style cartridge construction

Sun does not publicly specify complete alloy grades, heat-treatment data or hardness values for every internal component in the reviewed documentation, so these specifications should not be invented.

The most important manufacturing parameters for a counterbalance cartridge are:

Poppet and Seat Geometry

Controls shut-off leakage and reseating behavior.

Spool/Bore Clearance

Influences friction, movement and contamination sensitivity.

Spring Calibration

Controls pressure-setting consistency.

Pilot Passage Geometry

Determines pilot response and opening behavior.

Surface Finish

Influences friction, wear and leakage.

For aftermarket replacement, engineering quality should therefore focus on:

Dimensional Accuracy + Spring Calibration + Seal Integrity + Hydraulic Cleanliness + Functional Testing

Application Areas

Typical CBCA-LAN applications include:

• Boom cylinders
• Lift cylinders
• Telescopic cylinders
• Aerial work platforms
• Construction machinery
• Agricultural machinery
• Mobile cranes
• Material-handling machinery
• Hydraulic winches
• Hoisting equipment
• Excavator attachments
• Industrial actuator circuits

These applications typically involve a gravity load or overrunning load that can drive the actuator independently of commanded pump flow.

Selection Guide

When selecting a CBCA-LAN replacement, verify:

Valve Function → Pilot Ratio → Capacity → Cavity → Check Cracking Pressure → Pressure Setting → Seal

The CBCA-LAN configuration is:

3:1 + 60 L/min + T-11A + 1.7 bar Check + 70–280 bar + Buna-N

CBCA-LAN vs. CBBL-LJN

These models should not be treated as direct equivalents.

CBCA-LAN

• 3:1 pilot ratio
• Standard counterbalance
• 60 L/min
• T-11A
• Up to 280 bar setting

CBBL-LJN

• 2.3:1 pilot ratio
• Semi-restrictive counterbalance
• 40 L/min
• T-11A
• Up to 350 bar setting

Different pilot ratios and flow-gain characteristics produce different actuator behavior.

Expert Maintenance Tips

1. Do Not Set the Valve Equal to Maximum System Pressure

Sun recommends setting a counterbalance valve at least 1.3 times the maximum load-induced pressure.

The maximum valve setting and the machine’s normal operating pressure are therefore not the same parameter.

2. Account for Port 2 Back Pressure

Back pressure at Port 2 directly influences the effective relief setting.

This is a common reason why a valve can appear correctly adjusted yet still produce abnormal actuator lowering behavior.

3. Protect the T-11A Cavity

Before installation, inspect:

• Cavity cleanliness
• Thread condition
• Locating shoulder
• O-rings
• Pilot passage
• Seat contamination

Floating construction reduces binding risk but cannot compensate for a damaged or contaminated cavity.

4. Use the Specified Installation Torque

For CBCA-LAN:

41–47 Nm

Avoid excessive torque because installation forces can affect cartridge movement.

5. Maintain Hydraulic Cleanliness

Inspect:

• Filters
• Hydraulic oil
• Pilot passages
• Cartridge cavity
• Load-side circuit

Contamination can cause valve-seat damage, leakage, sticking and unstable motion.

6. Diagnose Chattering Systematically

For cylinder chatter, jerky lowering or pressure oscillation, inspect:

Pilot Pressure → Back Pressure → Pilot Ratio → Flow → Setting → Valve Condition

before replacing the actuator.

7. Choose the Valve by Function

Use the correct Sun valve family for the actual requirement:

Load Holding / Overrunning Load → Counterbalance

One-Way Free Flow → CXED

Pressure Reduction + Relief → PVFA

Adjustable Flow Control → NCEB / NFDD

This functional classification is more accurate than grouping all of these parts under a generic “pilot hydraulic valve” category.

8. Recommended Replacement Validation

For an aftermarket CBCA-LAN replacement, use:

Model Verification
→ T-11A Cavity Verification
→ Seal Inspection
→ Spring/Setting Verification
→ Cracking Pressure Test
→ Pilot Response Test
→ Flow Test
→ Leakage Test
→ Reseat Test
→ Load-Holding Test
→ Controlled-Lowering Test
→ 100% Simulated Working-Condition Test

Combined with In-Place Interchangeability, this provides a stronger B2B replacement proposition than simple dimensional matching.