CBCA-LHN | Sun Hydraulics Counterbalance Valve 350bar 60L/min

CBCA-LHN / CBCG-LJN / CBBC-LHN / CBEA-LHN / CXED-XCN

Product Overview

The CBCA-LHN, CBCG-LJN, CBBC-LHN, CBEA-LHN, and CXED-XCN are core threaded cartridge valve models from Sun Hydraulics, widely used for load control and directional control in mobile and industrial hydraulic systems. Since its founding in 1970, Sun Hydraulics has been a global leader in the design and manufacture of high-performance hydraulic threaded cartridge valves and integrated valve manifolds.

CBCA-LHN (3:1 Pilot Ratio Standard Counterbalance Valve):

The CBCA-LHN is a Sun Hydraulics CBCA series 3:1 pilot ratio standard counterbalance valve, fitting T-11A cavity. Counterbalance valves with pilot assist are designed to control an overrunning load. The check valve allows free flow from the directional valve (port 2) to the load (port 1), while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio.

CBCG-LJN (4.5:1 Pilot Ratio Standard Counterbalance Valve):

The CBCG-LJN is a Sun Hydraulics CBCG series 4.5:1 pilot ratio standard counterbalance valve, fitting T-11A cavity. The higher pilot ratio (4.5:1) provides more significant reduction of the relief setting per unit of pilot pressure, suitable for applications requiring lower pilot pressure to open the load.

CBBC-LHN (3:1 Pilot Ratio Semi-Restrictive Counterbalance Valve):

The CBBC-LHN is a Sun Hydraulics CBBC series 3:1 pilot ratio semi-restrictive counterbalance valve, fitting T-11A cavity. The semi-restrictive design balances load control precision with system efficiency.

CBEA-LHN (3:1 Pilot Ratio Standard Counterbalance Valve, T-2A Cavity):

The CBEA-LHN is a Sun Hydraulics CBEA series 3:1 pilot ratio standard counterbalance valve, fitting T-2A cavity. Compared to T-11A cavity models, the CBEA-LHN offers higher flow capacity (120 L/min).

CXED-XCN (Side-to-Nose Check Valve):

The CXED-XCN is a Sun Hydraulics CXED series side-to-nose check valve, fitting T-5A cavity. This valve allows free flow from the inlet (port 2) to the outlet (port 1) while blocking flow in the reverse direction. Side-to-nose check valves offer approximately 70% of the capacity of preferred nose-to-side models.

All models feature Sun Hydraulics’ signature floating style construction, minimizing the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

As original Sun Hydraulics threaded cartridge valves, these products offer complete interchangeability within the same series and cavity, requiring no modifications to manifold designs.

Technical Specifications (Bulleted List)

CBCA-LHN Specifications:

• Model: CBCA-LHN

• Brand: SUN HYDRAULICS

• Product Type: Pilot-Assisted Counterbalance Valve

• Pilot Ratio: 3:1

• Capacity: 60 L/min (15 gpm)

• Cavity: T-11A

• Maximum Operating Pressure: 350 bar (5000 psi)

• Functional Setting Range: 70–280 bar (1000–4000 psi)

• Standard Setting: 210 bar (3000 psi)

• Check Valve Cracking Pressure: 1.7 bar (25 psi)

• Valve Hex Size: 7/8 in. (22.2 mm)

• Installation Torque: 30–35 lbf·ft (41–47 N·m)

• Seal Material: Buna-N (Standard)

• Weight: Approx. 0.16 kg (0.35 lb)

• Seal Kit: Buna-N 990011007 / Viton 990011006

CBCG-LJN Specifications:

• Model: CBCG-LJN

• Brand: SUN HYDRAULICS

• Product Type: Pilot-Assisted Counterbalance Valve

• Pilot Ratio: 4.5:1

• Capacity: 60 L/min (15 gpm)

• Cavity: T-11A

• Maximum Operating Pressure: 350 bar (5000 psi)

• Maximum Recommended Load Pressure: 270 bar (3850 psi)

• Functional Setting Range: 70–280 bar (1000–4000 psi)

• Check Valve Cracking Pressure: 1.7 bar (25 psi)

• Valve Hex Size: 7/8 in. (22.2 mm)

• Installation Torque: 30–35 lbf·ft (41–47 N·m)

• Seal Material: Buna-N (Standard)

• Weight: Approx. 0.15 kg (0.33 lb)

• Seal Kit: Buna-N 990011007 / Viton 990011006

CBBC-LHN Specifications:

• Model: CBBC-LHN

• Brand: SUN HYDRAULICS

• Product Type: Semi-Restrictive Counterbalance Valve

• Pilot Ratio: 3:1

• Capacity: 40 L/min (10 gpm)

• Cavity: T-11A

• Maximum Setting: 280 bar (4000 psi)

• Maximum Recommended Load Pressure: 215 bar (3075 psi)

• Functional Setting Range: 70–280 bar (1000–4000 psi)

• Reseat: > 85% of setting

• Valve Hex Size: 7/8 in. (22.2 mm)

• Installation Torque: 30–35 lbf·ft (41–47 N·m)

• Weight: Approx. 0.16 kg (0.35 lb)

• Seal Kit: Buna-N 990011007

CBEA-LHN Specifications:

• Model: CBEA-LHN

• Brand: SUN HYDRAULICS

• Product Type: Pilot-Assisted Counterbalance Valve

• Pilot Ratio: 3:1

• Capacity: 120 L/min (30 gpm)

• Cavity: T-2A

• Maximum Setting: 280 bar (4000 psi)

• Maximum Recommended Load Pressure: 215 bar (3075 psi)

• Functional Setting Range: 70–280 bar (1000–4000 psi)

• Check Valve Cracking Pressure: 1.7 bar (25 psi)

• Standard Setting: 210 bar (3000 psi)

• Reseat: > 85% of setting

• Valve Hex Size: 1 1/8 in. (28.6 mm)

• Installation Torque: 45–50 lbf·ft (61–68 N·m)

• Weight: Approx. 0.29 kg

• Seal Kit: Buna-N 990202007

CXED-XCN Specifications:

• Model: CXED-XCN

• Brand: SUN HYDRAULICS

• Product Type: Free Flow Check Valve

• Capacity: 120 L/min (30 gpm)

• Cavity: T-5A

• Maximum Operating Pressure: 350 bar (5000 psi)

• Maximum Valve Leakage: <1 drop/min (0.07 cc/min)

• Valve Hex Size: 1 1/8 in. (28.6 mm)

• Installation Torque: 45–50 lbf·ft (61–68 N·m)

• Weight: Approx. 0.17 kg (0.37 lb)

• Seal Kit: Buna-N 990203007 / Viton 990203006

Key Technical Advantages

1. Floating Style Construction — Zero Binding

All Sun Hydraulics cartridge valves feature the patented floating style construction—the spool and sleeve can float slightly within the cavity, automatically compensating for concentricity deviations caused by excessive installation torque or cavity machining variations. This design dramatically reduces the risk of internal parts binding, ensuring reliable operation under all installation conditions.

2. Pilot-Assisted Counterbalance for Precise Overrunning Load Control

CBCA/CBCG/CBBC/CBEA series counterbalance valves are specifically designed to control overrunning loads. The check valve allows free flow from the directional valve (port 2) to the load (port 1), while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Pilot pressure at port 3 reduces the effective relief setting at a rate determined by the pilot ratio (3:1 or 4.5:1).

3. Multiple Pilot Ratios and Flow Capacities for Flexible Adaptation

Sun Hydraulics offers a comprehensive counterbalance valve matrix—CBCA-LHN (3:1/60 L/min), CBCG-LJN (4.5:1/60 L/min), CBBC-LHN (3:1 semi-restrictive/40 L/min), CBEA-LHN (3:1/120 L/min). Different pilot ratios and flow capacities flexibly adapt to diverse load conditions—from precision positioning to heavy lifting, from compact equipment to large mobile machinery.

4. Ultra-Low Leakage for System Stability

CXED-XCN check valve features maximum internal leakage of less than 1 drop/min (0.07 cc/min). CBCA/CBCG/CBBC/CBEA counterbalance valves feature reseat leakage of less than 5 drops/min (0.3 cc/min). Ultra-low leakage ensures actuator position stability and system pressure holding during extended holding periods.

5. Direct Actuator Housing Mounting for Enhanced System Rigidity

Sun Hydraulics counterbalance cartridges can be installed directly into a cavity machined in an actuator housing. Compared to external piping installations, direct cartridge mounting eliminates external tubing and fittings, significantly enhancing hydraulic circuit rigidity and impact resistance while reducing potential leak points.

6. International Standard Compliance for Global Interchangeability

All models utilize Sun Hydraulics standard cavities (T-11A, T-2A, T-5A), fully compatible with globally adopted threaded cartridge valve interfaces. Same-cavity, same-series products are directly interchangeable without manifold modifications.

Application Areas

CBCA-LHN / CBCG-LJN / CBBC-LHN (T-11A Cavity, 40–60 L/min):

• Construction Machinery — Load holding and control for excavator booms, arms, and buckets

• Agricultural Equipment — Load control for tractor implement lift and suspension systems

• Material Handling Equipment — Counterbalance control for forklift mast tilt and carriage lift

• Aerial Work Platforms — Safety locking and control for boom lift and telescope functions

• Truck-Mounted Cranes — Overrunning load control for outriggers and booms

CBEA-LHN (T-2A Cavity, 120 L/min):

• Large Construction Machinery — Heavy-duty load control applications requiring high flow

• Mining and Drilling Equipment — Overrunning load control for heavy hydraulic systems

• Marine and Port Machinery — High-flow load control for winches and cranes

CXED-XCN (T-5A Cavity, 120 L/min):

• Hydraulic Circuit Anti-Reverse Flow — General check valve applications preventing reverse flow

• Manifold Design Corrections — Circuit saver when manifold drillings are incorrect

• Bypass and Isolation Circuits — Various hydraulic circuits requiring one-way flow

Expert Maintenance Tips

1. Installation Guidelines

• Thoroughly clean the cavity and valve exterior before installation to prevent foreign particles from entering and causing seal damage or spool sticking.

• Follow manufacturer-recommended installation torque—T-11A cavity: 30–35 lbf·ft (41–47 N·m); T-2A/T-5A cavity: 45–50 lbf·ft (61–68 N·m).

• Sun Hydraulics floating style construction compensates for some installation variations, but standard cavity tooling is still recommended to ensure cavity dimensions and tolerances meet specifications.

2. Counterbalance Valve Setting Adjustment (CBCA/CBCG/CBBC/CBEA)

• Counterbalance valves should be set to at least 1.3 times the maximum load-induced pressure.

• Turn adjustment clockwise to decrease setting and release load; full clockwise setting is less than 200 psi (14 bar).

• Standard setting is 210 bar (3000 psi); functional setting range is 70–280 bar (1000–4000 psi).

• Adjustment range from minimum to maximum setting is 3.75 turns.

3. Hydraulic Fluid Cleanliness and Seal Materials

• Recommended fluids: Mineral-based hydraulic oil, viscosity range 2.8–380 cSt.

• Standard seal material is Buna-N. For phosphate ester fluids, select EPDM seal configuration.

• Recommended fluid cleanliness: ISO 4406 20/18/14 or better.

4. Back Pressure Effects (CBCA/CBCG/CBBC/CBEA)

• Back pressure at port 2 adds to the effective relief setting at a ratio of (1 + pilot ratio) × backpressure.

• This factor should be carefully considered during hydraulic circuit design to avoid unintended relief pressure increases.

5. Reseat Characteristics

• Reseat exceeds 85% of set pressure at standard setting.

• Settings lower than the standard set pressure may result in lower reseat percentages.

6. Periodic Maintenance Inspection

• Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.

• If load holding instability or actuator drift is observed, first check system fluid cleanliness and spool seal condition.

• Only external seals are serviceable in the field. Sun Hydraulics offers replacement seal kits for all cartridge models.