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He spent 7 days talking about with more than 30 hydraulic valve factories and got almost the same answer: the problem of damping hole blocking cannot be solved 100%, and the only way is to let the customer choose high-purity hydraulic oil. Brody knew that replying to guests in this way would not only get a claim, but also losing the whole market. He would also lose his job.

Hydraulic pressure valve is sought after by the market for its stable pressure control, small pressure rise and smooth overflow curve. The pilot requires a small flow of pressure oil to act on the pilot stage. The pressure oil is often guided into the pilot stage through the damping slender hole. Through the opening and closing of the pilot stage, changing the upper and lower pressure difference of the main stage spool to achieve the opening and closing of the main spool, so as to achieve the pressure control of large flow hydraulic oil.

However, under the actual working conditions, due to the high requirements for oil cleanliness of the damping slender hole, if not handled properly, the damping hole is easy to be blocked, resulting in the shutdown of the equipment and the failure of the whole hydraulic system. We realized this problem of pilot hydraulic pressure valve 2 years ago. AAK optimized the process of pilot hydraulic pressure valve. After about 1 year of exploration and demonstration, it is invented to add welded high-strength filter screen at the inlet section of pilot slender hole and local turbulent self-cleaning function, so as to reduce the impact of oil pollution on the normal operation of the valve. The opening and overflow characteristics are excellent, and the pressure curve is less affected by the change of overflow flow, which plays a very good protective role for the system. 1 year ago, a famous domestic construction machinery manufacturer purchased from AAK hydraulic valve and took the goods almost every month.