Sany Valve Assy-Balance-Winch

The Sany Valve Assy-Balance-Winch is a precision-engineered hydraulic counterbalance valve assembly that controls load-lowering speed and prevents uncontrolled free-fall on Sany heavy truck cranes, all‑terrain cranes, and large construction hoists.

This Sany Valve Assy-Balance-Winch integrates a high‑performance balance valve, two precision pipe connectors, a right‑angle flange connector, a split flange, and high‑strength screws into a single, factory‑matched assembly. When you need authentic replacement components, trust Sany Parts to deliver factory-original quality and precise fitment.

The Sany Valve Assy-Balance-Winch is specifically designed for Sany STC‑series and SAC‑series cranes, providing reliable load‑holding and smooth lowering control, ensuring maximum lifting safety and operational efficiency in the most demanding construction and mining applications.

Sany Valve Assy-Balance-Winch — OEM winch counterbalance valve assembly for Sany heavy truck cranes and all‑terrain cranes

What is the Sany Valve Assy-Balance-Winch?

The Sany Valve Assy-Balance-Winch is a complete OEM counterbalance valve assembly that controls the lowering speed of the winch and prevents uncontrolled free‑fall of heavy loads on Sany heavy lifting equipment. This assembly is essential for safe hoisting operations, ensuring that loads descend at a controlled, metered rate.

The Sany Valve Assy-Balance-Winch comprises five precision‑engineered components that function as an integrated flow control unit. The balance valve provides the core counterbalance function. Two pipe connectors and a right‑angle flange connector ensure leak‑tight interfaces to the hydraulic system. A split flange and high‑strength screws secure the assembly.

The Sany Valve Assy-Balance-Winch is critical for crane safety and performance. It prevents the winch from overspeeding during load lowering, protecting the hydraulic motor from cavitation and damage. The valve also maintains load position when the control valve is in neutral, preventing load drift.

This assembly is a direct replacement for worn or damaged winch counterbalance valves on Sany STC‑series and SAC‑series cranes. By using this genuine assembly, you ensure that the valve cracking pressure and pilot ratio match factory specifications, eliminating performance degradation and safety risks associated with mismatched aftermarket components.

Product Parameters of Sany Valve Assy-Balance-Winch

Technical specifications: The Sany Valve Assy-Balance-Winch is designed for a maximum operating pressure of 35 MPa (5,075 psi) on the pump side and 45 MPa (6,525 psi) on the motor side. The balance valve features a pilot‑operated counterbalance design with a pilot ratio of 4:1, ensuring smooth load lowering and preventing free‑fall.

The pipe connectors and right‑angle flange connector are zinc‑nickel coated for 500+ hours of salt spray resistance, featuring 24° metal‑to‑metal sealing cones that do not require gaskets or sealants. The split flange provides a secure, vibration‑resistant mounting interface. The screws are property class 10.9 with corrosion‑resistant coating.

All components are manufactured under ISO 9001:2025 certification and are 100% traceable to original production batches. The assembly has been validated on Sany STC and SAC series cranes, demonstrating a field service life exceeding 8,000 operating hours under heavy‑duty winching conditions when properly maintained.

Why Choose Our Sany Valve Assy-Balance-Winch?

Complete 5‑Component OEM Kit — No Missing Parts: The Sany Valve Assy-Balance-Winch includes the balance valve, two pipe connectors, a right‑angle flange connector, a split flange, and all screws as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual components from different suppliers.

Integrated Counterbalance for Safe Load Lowering: The Sany Valve Assy-Balance-Winch incorporates a pilot‑operated balance valve that controls winch descent speed and prevents load free‑fall. This valve ensures smooth, metered lowering even with heavy loads, protecting the motor from overspeed and cavitation.

Corrosion‑Resistant Connectors for Long‑Term Durability: The Sany Valve Assy-Balance-Winch uses zinc‑nickel coated pipe connectors and flanges that provide 500+ hours of salt spray resistance. This protection ensures leak‑free sealing and corrosion resistance in harsh mining, coastal, and winter road salt environments.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Valve Assy-Balance-Winch is standard equipment on Sany STC‑series and SAC‑series cranes in over 80 countries. Fleet data shows that genuine Sany balance valve assemblies deliver an average service life exceeding 8,000 hours—three times longer than generic aftermarket assemblies—while eliminating valve sticking and load‑dropping incidents. The assembly is backed by a 24‑month manufacturer’s warranty covering valve body cracking, seal leakage, and screw failure. Volume pricing, consignment stock, and global technical support are available for large fleets.

What are the Routine Maintenance Considerations for the Sany Valve Assy-Balance-Winch?

Daily visual inspection before operation: Before each shift, inspect the Sany Valve Assy-Balance-Winch for visible oil leaks around the valve body, pipe connectors, and flange. Check that all screws (A210204000024) are tight and that the split flange (B229900000333) is correctly seated. Any external drip indicates a loose fitting or damaged seal and requires immediate attention.

Hydraulic fluid cleanliness and filtration — every 500‑1,000 hours: The Sany Valve Assy-Balance-Winch requires hydraulic fluid cleanliness of ISO 4406:2017 code 18/16/13 or better. Contaminated fluid is the leading cause of valve spool sticking and seal damage. Take fluid samples every 1,000 hours for particle count analysis. In dusty environments, increase the fluid change interval to every 500 hours and replace all return line filters.

Valve function test and screw torque check — every 1,000 operating hours: Test the Sany Valve Assy-Balance-Winch by lowering a rated load and observing smoothness and speed consistency. If the winch jerks or fails to hold load, the balance valve may require adjustment or replacement. Using a calibrated torque wrench, verify the torque of all screws to the manufacturer specification (typically 25‑30 Nm).

Preventative replacement schedule — every 4,000 hours or 2 years: For high‑use cranes, Sany recommends a full replacement of the Sany Valve Assy-Balance-Winch every 4,000 operating hours or 2 years. Replace the balance valve, connectors, flange, and all screws as a set. Even if no visible wear is apparent, internal spring fatigue and seal degradation can occur without warning. Keep a detailed maintenance log tracking fluid change dates, test results, and component replacement history. By following this proactive schedule, the Sany Valve Assy-Balance-Winch can reliably exceed 8,000 operating hours.

The balance valve (B220401000703) is the core component of the Sany Valve Assy-Balance-Winch. This pilot‑operated counterbalance valve creates a backpressure on the motor return port, ensuring that the load descends at a controlled rate. The valve body is manufactured from high‑strength steel with precision‑ground spool bores that ensure minimal internal leakage. The valve is factory‑set to the correct cracking pressure and pilot ratio.

The pipe connectors (A229900002570) and right‑angle flange connector (A229900003567) are precision‑machined steel fittings that provide leak‑tight interfaces between the balance valve and the hydraulic hoses. These connectors feature 24° metal‑to‑metal sealing cones that create a positive seal without the need for gaskets or sealants. The connectors are zinc‑nickel coated to resist corrosion and are compatible with standard steel tubing.

The split flange (B229900000333) provides a secure, vibration‑resistant mounting interface for the valve assembly. This flange design distributes clamping load evenly across the mounting surface, preventing localized stress concentrations that could cause cracking. The screws (A210204000024) are property class 10.9 fasteners with a corrosion‑resistant coating, ensuring reliable clamping force over the life of the assembly.

For Sany cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Valve Assy-Balance-Winch. The valve may have slightly slower response until the fluid warms; allow the machine to idle for 10‑15 minutes before full winch operation. Use low‑viscosity hydraulic fluid (ISO VG 22) to ensure proper valve response during cold starts. Inspect the O‑ring seals for hardening; replace if leakage is observed. Screws should be retorqued after the first cold cycle, as thermal contraction can reduce clamping force.

The Sany Valve Assy-Balance-Winch is also available as part of a complete winch hydraulic system overhaul kit, which includes the balance valve assembly, the winch motor, the main control valve, and all necessary hoses and fittings. Sany recommends this complete‑kit approach for vehicles with over 8,000 operating hours, as it allows the entire winch hydraulic system to be renewed in a single service event, eliminating the risk of hidden valve wear or seal degradation that could compromise lifting safety.

Fleet managers using this strategy report a 50% reduction in winch system‑related breakdowns and a 40% reduction in total crane maintenance costs over the equipment’s life. Contact our parts specialists through the Get Quotation button above for custom kit configurations tailored to your fleet’s specific needs.