First of all, keeping the normally open servo valve clean is the basis to ensure its normal operation. The servo valve has a precise structure, and the gap between the internal slide valve and the valve body is extremely small, which is easily polluted by impurities
in the oil, resulting in jamming or slow response. Therefore, high-quality hydraulic oil must be used, and the oil filter should be replaced or cleaned regularly to ensure that the oil cleanliness of the system reaches NAS 6 or higher.
Secondly, regular inspection and debugging is an important means to maintain the performance of servo valve. The operator shall regularly check the working pressure, flow gain, zero offset and other parameters of the servo valve according to the requirements of the equipment manual, and find any abnormality in time and make adjustment or replacement. Especially when the control accuracy of the system decreases or the response is unstable, the state of the servo valve should be checked first.
Thirdly, maintaining a suitable working environment is also the key to prolong the service life of the servo valve. High temperature, high humidity, vibration and electromagnetic interference may affect the electrical and mechanical properties of servo valves. Therefore, the servo valve should be installed in the control cabinet with good ventilation and moderate temperature, and dust-proof, shock-proof and electromagnetic shielding measures should be taken.
In addition, reasonable operation and usage habits can not be ignored. In the process of system startup and shutdown, the sudden rise and fall of oil pressure should be avoided to prevent the impact load from damaging the servo valve. At the same time, avoid frequent power on and off, and avoid shortening the service life due to repeated start and stop of the electromagnetic coil.
Finally, it is suggested to establish perfect maintenance files and fault records, and make detailed records of each maintenance, replacement of parts and fault treatment, which is convenient for analyzing trends and predicting faults, thus realizing preventive maintenance management.
To sum up, in order to keep the normally open servo valve in good operation, it is necessary not only to start from daily cleaning, regular inspection, environmental control, standardized operation and other aspects, but also to establish a system maintenance mechanism. Only in this way can we give full play to its key role in the automatic control system and ensure the efficient, safe and stable operation of the equipment.