B220400000083 Relief Valve Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

B220400000083 Relief Valve Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

The Sany B220400000083 relief valve is a core pressure control component specifically designed for the hydraulic systems of Sany engineering machinery. It employs a pilot-operated precision structure, utilizing the balance between hydraulic pressure and spring force on the valve core to regulate pressure. It controls the system’s maximum working pressure through relief, while simultaneously providing system pressure stabilization, overload protection, and remote pressure adjustment. It is primarily used to adapt to various hydraulic circuits in Sany equipment, compensate for assembly tolerances of hydraulic system components, ensure stable system pressure, and prevent damage to hydraulic pumps, pipelines, valve assemblies, and other components due to excessive pressure, thereby reducing equipment wear and downtime losses.

Core technical parameters

Model: Sany B220400000083
Material: The valve body is made of high-quality ductile iron (QT450-10), conforming to GB/T 1348-2009 standard; the valve core is made of 304 stainless steel, which is wear-resistant and corrosion-resistant; the seals are made of fluororubber (FKM), paired with a high-quality pressure regulating spring.
Operating temperature: typically -25℃ to 120℃
Operating parameters: Rated working pressure 31.5MPa, maximum working pressure 35MPa, rated flow rate 63L/min, suitable for the conventional pressure and flow requirements of SANY hydraulic systems; pressure adjustment range 5~31.5MPa, small pressure adjustment deviation, small pressure fluctuation, control accuracy ±1%, rapid response, and can quickly cope with system pressure fluctuations; opening pressure error ≤±0.5MPa, closing pressure recovery rate ≥90%, ensuring stable system pressure; compatible hydraulic oil viscosity range 10~100mm²/s, compatible with SANY equipment-specific hydraulic oil.
Structural Design: Utilizing a pilot-operated structure, consisting of a main valve and a pilot valve, it offers higher pressure regulation accuracy and is suitable for high-pressure, high-flow scenarios. Installation is plate-mounted (compliant with DIN 24340 standard), with a G3/4 internal thread interface, compatible with original factory mounting positions and allowing for direct replacement. An integrated unloading circuit enables remote pressure regulation and multi-stage pressure control, adapting to complex hydraulic control requirements. A pressure adjustment knob facilitates precise on-site pressure adjustment and convenient operation. Optimized flow path design reduces oil resistance, lowers energy loss, and improves system efficiency.
Shape and size: The overall structure is compact, with a main body length of 110mm, width of 75mm, height of 90mm, mounting hole spacing of 90mm, mounting hole diameter of 12mm, and inlet/outlet diameter of 18mm.

Core functions and roles

As the “safety guardian” of Sany’s hydraulic systems, its core function is to precisely control the maximum working pressure of the hydraulic system, achieving overflow pressure stabilization and overload protection. It can also be used as an unloading valve and a remote pressure regulating valve to adapt to complex hydraulic circuit control needs. In the hydraulic systems of Sany’s construction machinery (such as excavators, cranes, loaders, and concrete pump trucks), it is connected in parallel to the hydraulic pump outlet. When the system pressure does not reach the set value, the overflow valve closes, and all the oil output by the pump enters the hydraulic actuators. When the system pressure exceeds the set pressure, the overflow valve automatically opens, and excess oil overflows back to the oil tank, limiting the system pressure from rising further and protecting the hydraulic components from damage. It effectively avoids problems such as excessive pressure, excessive pressure fluctuations, valve core jamming, and oil leakage, reducing equipment downtime losses, extending the overall service life of the hydraulic system and equipment, and lowering later maintenance costs. It is a key component ensuring the safe, stable, and efficient operation of Sany equipment’s hydraulic systems.

Applicable Scenarios

Widely used in the core hydraulic systems of Sany construction machinery, such as the hydraulic circuits of Sany SY215 and SY265 series excavators, cranes, loaders, and concrete pump trucks, it is compatible with the overflow stabilization and overload protection of fixed displacement pump hydraulic systems. It is also compatible with Sany equipment hydraulic pump stations, hydraulic valve groups, and other related hydraulic systems, serving as a safety valve, unloading valve, and remote pressure regulating valve. It is an indispensable core pressure control component in equipment manufacturing, overhaul, and precision maintenance. Particularly suitable for harsh operating environments such as construction sites, mines, municipal construction, and oil and gas exploration, it maintains stable performance under high pressure, high temperature, high humidity, and dusty conditions, ensuring continuous and efficient operation of the equipment’s hydraulic system and preventing equipment failure due to pressure overload.

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