
:Common Faults of Pilot-Operated Relief Valves
Common Faults of Pilot-Operated Relief Valves

The Oil Overflow Method of Pressure Relief Valve
The Oil Overflow Method of Pressure Relief Valve

The solenoid valves used in hydraulic lift valve
A brief introduction to the solenoid valves used in hydraulic lift valve

Differences Between Relief Valves and Pressure-Reducing Valves

Understanding Pilot-Operated Relief Valves: Detailed Video Guide
How a Pilot-Operated Relief Valve Works (Video Teardown & Explanation)

How to Disassemble a Hydraulic Balance Valve: A Practical Guide for Mechanics
In this vedio, we'll walk through a clear, step-by-step guide on balance valve disassembly.

Ningbo Longerfa Hydraulic at bauma CHINA: Bringing Our Valves to the Global Stage
Every two years, the construction machinery world gathers in Shanghai for one of the biggest events in the industry—bauma CHINA, the International Trade Fair for Construction Machinery, Building Material Machines, Mining Machines, and Construction Vehicles. For Ningbo Longerfa Hydraulic Co., Ltd., this event is more than just a trade show. It's an opportunity to meet our customers face-to-face, showcase our latest hydraulic solutions, and share our vision for the future of heavy machinery.

How Hydraulic Valves in Excavators Ensure Smooth Operation
In the modern construction industry, excavators are the backbone of numerous critical operations—from trenching and demolition to material handling and grading. Their versatility and efficiency depend heavily on one essential system: hydraulics. Central to this system are hydraulic valves, the unsung heroes that regulate the flow and pressure of hydraulic fluid, allowing excavators to perform smooth, precise, and powerful movements.
As a leading manufacturer of threaded cartridge valves and construction machinery valves, Ningbo Longer Hydraulic Co., Ltd. is at the forefront of developing advanced valve technology that powers excavators and other heavy machinery around the globe.

Discover the High-Performance 310-0395 Relief Valve for CAT320C – Now Available from Ningbo Longer Machinery
Ningbo, China – Ningbo Longer Machinery Co., Ltd., a leading supplier of construction machinery spare parts, is proud to announce the continued availability and export of the 310-0395 Relief Valve, an essential hydraulic component designed for the CAT320C Caterpillar excavator. With growing global demand for reliable, high-performance spare parts, Ningbo Longer is positioned as a trusted partner for international buyers seeking OEM-quality products at competitive prices.

How to Troubleshoot and Maintain Excavator Relief Valves
Excavators are indispensable machines in construction, mining, and various industrial operations across Southeast Asia. At the heart of every excavator’s hydraulic system lies a critical component: the hydraulic relief valve. This component plays a vital role in controlling system pressure and protecting the hydraulic circuit from damage caused by pressure overload. When a relief valve fails, the entire system can suffer — leading to costly downtime and repairs.
As a leading hydraulic valve manufacturer, NINGBO LONGERFA understands the importance of maintaining peak performance in your excavator’s hydraulic system. In this article, we will provide a comprehensive guide on how to troubleshoot and maintain excavator relief valves, helping you extend the life of your equipment and reduce unexpected breakdowns.











