The spring and solenoid of the product have undergone 3 million cycles of testing. After long-term fatigue testing, they continue to ensure reliable pressure holding and shifting sensitivity. Additionally, the valve features a steel ball-type hard sealing structure, distinguishing it from conventional spool valves. It achieves zero-leakage shut-off, with no risk of internal leakage even under prolonged high-pressure holding. This makes it an ideal choice for hydraulic locking and pressure-holding circuits, and it is widely used in various construction machinery and industrial hydraulic systems.