- Hydraulically Operated Check Valve and Valve Block
- Construction Machinery Relief Valve Series
- Standard Valve Cavity and Custom Valve Block
- Standard Valve Block and Hydraulic Valve Set
- Load Control Valves and Others
- Logic Element
- Flow Control Valve
- Pressure Control Valve
- Directional Control Valve
- Solenoid Valve
SY75 Main Relief Valve 60310755
SY75 Main Relief Valve 60310755
Fit for SY75 series excavators, this main relief valve (part no.: 60310755) is from Ningbo Longerfa Hydraulic Co., Ltd.—a professional hydraulic parts manufacturer in Ningbo, China, specializing in cartridge valves, valve blocks and precision components.
Longerfa holds ISO9001/ISO45001 certifications and patents, with advanced CNC equipment and testing tools. Every 60310755 valve undergoes 100% performance verification to meet industry standards.
This valve delivers reliable overpressure protection for SY75 excavator hydraulic systems, fits original specs for direct replacement, and reduces maintenance time. Trusted by global aftermarket users, it’s widely applied in construction, mining and municipal engineering.



