Sany Valve Assy-Throttle-Check

The Sany Valve Assy-Throttle-Check is a complete OEM hydraulic flow control and anti‑cavitation module that precisely regulates actuator speed and prevents vacuum‑induced damage on Sany heavy truck cranes, all‑terrain cranes, and large excavators, ensuring smooth, controlled machine movements.

This Sany Valve Assy-Throttle-Check integrates a one‑way valve, a throttle check valve, a hydraulic accumulator, multiple pipe connectors, a sealing plug, and a damping screw plug 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-Throttle-Check is specifically designed for Sany STC‑series and SAC‑series cranes, providing reliable speed control, load‑holding, and shock absorption, ensuring smooth, predictable actuator response and enhanced operator comfort in the most demanding lifting applications.

Sany Valve Assy-Throttle-Check — OEM throttle check and accumulator assembly for Sany heavy truck cranes and all‑terrain cranes

What is the Sany Valve Assy-Throttle-Check?

The Sany Valve Assy-Throttle-Check is a complete OEM hydraulic control module that combines speed regulation, anti‑cavitation protection, and pressure damping in a single compact assembly. This component ensures smooth, controlled actuator movements while protecting the hydraulic system from shock loads and vacuum‑induced damage.

This assembly comprises eight precision‑engineered components that function as an integrated flow control and cushioning unit. The one‑way valve (B220401000045) provides free flow in one direction while blocking reverse flow. The throttle check valve (10138465) allows adjustable metering in one direction and free flow in the opposite direction. A hydraulic accumulator (B229900001695) absorbs pressure spikes and supplies supplemental flow. Multiple pipe connectors, a sealing plug, and a damping screw plug complete the assembly.

The Sany Valve Assy-Throttle-Check is critical for machine control smoothness and component longevity. It controls actuator speed to prevent jerky movements, prevents cavitation by allowing free flow into the actuator when load‑induced vacuum occurs, and dampens pressure spikes that could damage hoses and fittings.

This assembly is a direct replacement for worn or damaged throttle‑check valve units on Sany STC‑series and SAC‑series cranes, as well as large excavators. By using this genuine assembly, you ensure that all valve settings, orifice sizes, and accumulator pre‑charge pressures match factory specifications, eliminating flow imbalances and pressure issues that can compromise machine control and hydraulic component life.

Product Parameters of Sany Valve Assy-Throttle-Check

Technical specifications: The Sany Valve Assy-Throttle-Check is designed for a maximum operating pressure of 35 MPa (5,075 psi) and a flow capacity up to 120 L/min. The throttle check valve (10138465) features an adjustable metering orifice with a locking screw to maintain the set speed. The one‑way valve (B220401000045) has a cracking pressure of 0.05 MPa (7.25 psi).

The accumulator (B229900001695) is a 0.5‑liter bladder type with a nitrogen pre‑charge pressure of 2.5 MPa (362 psi), designed to absorb pressure shocks and supplement flow during rapid actuator movements. All connectors are zinc‑nickel coated for 500+ hours of salt spray resistance, featuring 24° metal‑to‑metal sealing cones. The damping screw plug (10890177) provides an adjustable orifice for tuning the response of the accumulator circuit.

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 conditions when properly maintained.

Why Choose Our Sany Valve Assy-Throttle-Check?

Complete 8‑Component OEM Kit — No Missing Parts: The Sany Valve Assy-Throttle-Check includes the one‑way valve, throttle check valve, accumulator, all connectors, plug, and damping screw plug as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual components from different suppliers.

Integrated Speed Control, Anti‑Cavitation, and Shock Absorption: The Sany Valve Assy-Throttle-Check combines three critical functions in one assembly: adjustable speed control via the throttle check valve, anti‑cavitation protection via the one‑way valve, and pressure spike damping via the accumulator. This integrated design simplifies the hydraulic circuit and improves reliability.

Adjustable Damping for Customized Performance: The Sany Valve Assy-Throttle-Check includes a damping screw plug (10890177) that allows technicians to fine‑tune the response of the accumulator circuit, customizing the damping characteristics to match specific machine preferences and operating conditions.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Valve Assy-Throttle-Check is standard equipment on Sany STC‑series and SAC‑series cranes in over 80 countries. Fleet data shows that genuine Sany throttle‑check assemblies deliver an average service life exceeding 8,000 hours—three times longer than generic aftermarket assemblies—while eliminating speed control instability and cavitation damage incidents. The assembly is backed by a 24‑month manufacturer’s warranty covering valve body cracking, seal leakage, and accumulator bladder 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-Throttle-Check?

Daily visual inspection before operation: Before each shift, inspect the Sany Valve Assy-Throttle-Check for visible oil leaks around the valve bodies, connectors, accumulator, and plugs. Check that all fittings are securely tightened and that no fasteners have backed out. Look for any signs of physical damage to the accumulator shell. 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-Throttle-Check requires hydraulic fluid cleanliness of ISO 4406:2017 code 18/16/13 or better. Contaminated fluid is the leading cause of valve sticking, orifice wear, and accumulator 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. Maintain fluid viscosity within the recommended range (ISO VG 46 for normal conditions, ISO VG 32 for cold climates).

Accumulator pre‑charge check and connector torque — every 1,000 operating hours: Check the accumulator (B229900001695) pre‑charge pressure using a nitrogen charging kit. If the pressure has dropped by more than 10% of the specified value, recharge with dry nitrogen. Do not use oxygen or compressed air. Using a calibrated torque wrench, verify the torque of all pipe connectors and the damping screw plug to the manufacturer specification (typically 25‑30 Nm). Mark each connector after torquing for quick visual verification.

Preventative replacement schedule — every 4,000 hours or 2 years: For high‑use cranes and excavators, Sany recommends a full replacement of the Sany Valve Assy-Throttle-Check every 4,000 operating hours or 2 years. Replace the throttle check valve, one‑way valve, accumulator, connectors, plugs, and damping screw plug as a set. Even if no visible wear is apparent, internal seal degradation, orifice erosion, and accumulator bladder fatigue 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-Throttle-Check can reliably exceed 8,000 operating hours.

The throttle check valve (10138465) is the primary flow control component of the Sany Valve Assy-Throttle-Check. This valve features an adjustable metering orifice that restricts flow in one direction while allowing free flow in the opposite direction. The adjustment is made by turning the needle screw, which changes the effective orifice area. A locking screw secures the setting to prevent drift from vibration. If the valve fails to maintain the set speed or shows erratic operation, internal wear or contamination may be present.

The one‑way valve (B220401000045) is a spring‑loaded poppet valve that allows free flow in one direction and blocks flow in the reverse direction. This valve provides anti‑cavitation protection by allowing oil to flow into the actuator when load‑induced vacuum occurs, preventing air ingestion and component damage. The valve’s cracking pressure is factory‑set to 0.05 MPa. If the valve fails to seal, internal leakage can cause load drift and control instability.

The accumulator (B229900001695) is a bladder‑type pressure vessel that stores hydraulic energy and absorbs pressure spikes. It contains a flexible bladder filled with dry nitrogen gas at a pre‑charge pressure of 2.5 MPa. When system pressure exceeds the pre‑charge pressure, oil enters the accumulator, compressing the gas. When pressure drops, the gas expands, pushing oil back into the system. This dampens pressure shocks and provides supplemental flow during rapid actuator movements. The accumulator should be tested for pre‑charge pressure regularly and recharged if necessary.

For Sany cranes and excavators operating in extreme cold climates (below -25°C), special considerations apply to the Sany Valve Assy-Throttle-Check. The accumulator pre‑charge pressure should be checked and adjusted for low temperatures, as gas pressure drops with temperature. Use low‑viscosity hydraulic fluid (ISO VG 22) to ensure proper valve response during cold starts. The throttle check valve may require slight adjustment to compensate for increased fluid viscosity. Connector torque should be checked after the first cold cycle, as thermal contraction can reduce clamping force.

The Sany Valve Assy-Throttle-Check is also available as part of a complete hydraulic control system overhaul kit, which includes the throttle‑check assembly, 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 flow control and cushioning system to be renewed in a single service event, eliminating the risk of hidden valve wear or accumulator bladder fatigue that could compromise machine control and safety.

Fleet managers using this strategy report a 50% reduction in hydraulic control‑related breakdowns and a 40% reduction in total hydraulic system 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.