DH500 Main Relief Valve 31QB-17731K

DH500 Main Relief Valve 31QB-17731K

Fit for DH500 series excavators, this main relief valve (part number: 31QB-17731K) is a high-performance hydraulic component from Ningbo Longerfa Hydraulic Co., Ltd.—a professional manufacturer of hydraulic cartridge valves, valve blocks, and precision hydraulic parts, located at No. 18 Xingye East Road, Xiepu Town, Zhenhai District, Ningbo, Zhejiang, China.

Certified by ISO9001 and ISO45001, Longerfa holds multiple national invention and utility model patents, and is recognized as a 2023 Zhenhai District Enterprise Technology R&D Center. With imported precision CNC machining equipment and advanced hydraulic testing tools (pressure calibration instruments, durability test platforms), the company ensures each 31QB-17731K valve meets strict manufacturing standards. Every product undergoes 100% performance verification (pressure precision, overflow stability, high-pressure resistance) and life cycle tests that exceed industry requirements.

Upholding "Quality First, Service First," Longerfa optimizes production and quality control for this valve, making it a reliable choice for DH500 excavator aftermarket maintenance and replacement.