Sun counterbalance valves are precision hydraulic components designed to safely control overrunning or suspended loads. They maintain stable pressure, prevent load drift, and ensure smooth, controlled motion in lifting and holding applications. Widely used in construction equipment, cranes, material-handling systems, and industrial machinery, Sun counterbalance valves offer reliable load-holding performance, excellent pressure stability, and long service life. Their compact cartridge design allows easy installation into manifolds, reducing system size while improving safety, operational efficiency, and overall hydraulic system reliability.

✔ Directly interchangeable with Sun Hydraulics, HydraForce, Bosch Rexroth, and Yuken brands.
✔ Lower cost compared to OEM brands
✔ Small batch orders supported
✔ Fast delivery & stable supply
✔ 100% pressure tested before shipment
✔ High-strength materials for long service life
✔ Multiple cavity options available, Custom specifications supported

Characteristic Description

  • Poppet construction for minimal leakage
  • Incorporates direct acting relief for overload protection
  • Part-ion products accord with industry common cavity
  • Can be directly mounted into cylinder or motor eliminating
  • requirement for manifold block.
  • Pilot rations available
  • Screw-in cartridge

What is a Sun Counterbalance Valve?

A Sun Counterbalance Valve is a hydraulic valve designed to prevent unintended movement of loads in hydraulic systems. It ensures that loads remain stationary or are controlled under varying pressures by regulating fluid flow in one direction and blocking it in the opposite. These valves are typically used in systems where load stability is crucial, such as hydraulic cylinders, mobile equipment, and industrial machinery, where heavy parts or loads need to be safely held in place.

The Sun Counterbalance Valve works by providing a check valve function combined with pressure relief capabilities, which means it allows fluid flow in one direction but blocks it in the opposite direction to prevent backflow or unintended movements. This ensures that the load stays secure until the operator decides to move it.

Key Features & Benefits

Prevents Load Drop

Ensures loads are securely held in place, preventing unexpected drops, which is critical in construction and lifting operations.

Reverse Flow Protection

Protects against reverse flow in hydraulic circuits, preventing potential damage to the system and enhancing operational safety.

High Pressure Capability

Designed to withstand high pressures, offering durable and reliable performance under challenging operating conditions.

Customizable Options

Available in a variety of pressure ratings, flow rates, and connection types, allowing customization for different hydraulic systems.

Technical Specifications

Specification Value Details
Max Operating Pressure Up to 350 bar Maximum pressure the valve can handle
Flow Range Adjustable based on application Flow rate varies depending on specific needs
Connections Available BSPP, NPT, SAE Different connection types for compatibility
Temperature Range -20°C to +100°C Operating temperature range
Valve Type Pilot-operated, spring-loaded Type of mechanism used in the valve
Material High-strength steel or stainless steel Material used for durability

Load Control Valves Function Choice

Directional Control Valve Function Choice

Model Choice Spring Ranges Pilot Ratios Max.Flow
BPF08-00 (536 downloads) 240bar 4:1 30L/min
BPF10-00 (538 downloads) 270bar    
BPF10-01 (551 downloads)   10:1 60L/min
BPF12EG-00 (535 downloads) 320bar 4.5:1 120L/min
BPF12EG-01 (555 downloads) 270bar    
BPF12CA-03 (534 downloads) 215bar 3:1 60L/min
BPF12S-02 (580 downloads) 270bar 4:1 90L/min
BPD16GG-00 (489 downloads)   4.5:1 240L/min
BPF16GG-01 (534 downloads) 320bar    
Model Choice Spring Ranges Pilot Ratios Max.Flow
BDPF10-00 (549 downloads) 270bar 4:1 30L/min
BFPF20-01 (564 downloads)   8.15:1 120L/min
BFPF20-02 (557 downloads)   3:1 140L/min
Model Choice Spring Ranges Pilot Ratios Max.Flow
BDPF12EG-01 (536 downloads) 270bar 4.5:1 120L/min
BDPF16GG-01 (567 downloads)     240L/min
Model Choice Spring Ranges Pilot Ratios Max.Flow
BPF16S-00 (516 downloads) 270bar 3.5:1 120L/min
BPF08S-00 (509 downloads)   5.0:1 30L/min

Sun Counterbalance Valve Applications

Cranes

Excavators

Forklifts

Seeders

Hydraulic Presses

Skid Steers

Sun Counterbalance Valve Installation

Install the valve in the hydraulic circuit where load control is needed. Ensure it is placed in line with the hydraulic cylinder or actuator to effectively control load movement.

Connect the valve to the hydraulic system using the appropriate fittings (BSPP, NPT, SAE, etc.) and ensure that all connections are tight and leak-free.

Pay attention to the correct orientation of the valve to ensure proper fluid flow and functionality. Some counterbalance valves have a specific direction for fluid to flow through.
Ensure the hydraulic system pressure does not exceed the maximum pressure rating of the valve. Proper pressure setting is crucial for effective operation.

Use compatible hydraulic fluid as recommended by the manufacturer to avoid damage or poor performance of the valve.

Sun Counterbalance Valve Maintenance

Periodically check the valve for signs of wear, leaks, or any unusual operation. Inspect all connections for tightness. Also, regularly inspect seals for wear and replace them as needed to maintain a tight and efficient hydraulic system. Recheck the system’s pressure settings to ensure the valve continues to operate within its rated limits.

Keep the valve and surrounding area clean to avoid dirt or debris entering the system, which could impair the valve’s performance.

Ensure that the valve is properly lubricated (if necessary) to reduce friction and wear over time.

Change the hydraulic fluid as per the manufacturer’s recommendations to maintain optimal valve performance and prevent contamination.

 

Sun Counterbalance Valve FAQs

The maximum operating pressure typically ranges up to 350 bar, but it may vary depending on the specific model. Always check the manufacturer’s specifications for exact pressure limits.

Sun Counterbalance Valves typically offer various connection types, including BSPP, NPT, and SAE to accommodate different hydraulic systems.

The typical temperature range for these valves is from -20°C to +100°C. It’s important to ensure that the system operates within this range to avoid damage or malfunction.

Regular inspections should be done periodically, typically every 3–6 months, depending on the system’s usage. Checking for leaks, wear, and pressure settings are essential to maintaining optimal performance.

Yes, many models feature adjustable pressure settings. However, these adjustments should be made carefully, based on system requirements, and according to the manufacturer’s guidelines.

If you notice leakage, inspect the valve for loose connections or damaged seals. If needed, replace seals or consult the manufacturer for repair options.

Compatible hydraulic fluids typically include mineral-based oils, synthetic oils, and other fluids approved by the manufacturer. Always refer to the valve’s specifications for the recommended fluid.

Why Choose Us

With unmatched quality, competitive pricing, complete pre- and after-sales support, and fast, secure delivery, BSTIND has become one of the world’s leading manufacturers of gas spring–based solutions.

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