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Solenoid Valve Supplier
inquiry@ato.com.cnIs a Solenoid Valve Strainer Necessary?
Is it necessary to add a strainer upstream the solenoid valve? How to add? What are the benefits? A fine mesh may affect the flow while a coarse mesh may be unable to realize filtration, what shall the proper strainer be? Is it necessary to add a filter upstream any kind of solenoid valve? Here we will discusses the necessity of adding a strainer upstream the solenoid valve.
The solenoid valve has no stuffing box inner chamber, and the valve’s working parts contact with the medium directly. The cleanliness of medium directly affects the reliable operation of solenoid valve working parts. Sliding clearance of the moving iron core is directly related with the cleanliness of medium. Particularly, if there’s a sliding gap in the spool of main valve, the massive long-term accumulated impurities in the gap directly determines whether the solenoid valve can work reliably or not. Therefore, we should consider the filtering precision from the sliding gap, especially from the sliding gap of the main valve.
Sliding gap exists in the main spool of solenoid valve when it works. The gap size is related to the medium and solenoid valve size, which is generally 0.08~0.3mm. Sliding gap of the moving iron core is about 0.1mm, so users can consider the filtering precision from a gap of 0.08mm on both sides. Due to the existence of massive impurity particles (larger than 0.08mm), the spool of main valve may be stuck and be unable to work.
It is tested that when the aperture of the strainer is 0.125 mm, the size of impurity particles in the hydraulic system with a working pressure less than 14.0MPa is 0.025-0.05 mm. The mesh filter is mounted on the suction pipe with the aperture of 0.8~1.3mm. After filtration, size of common particles are 0.13~0.4mm.
Therefore, it’s assumed from the concept of probability that, if most of the impurity particles in filtered media are not larger than 0.04-0.08mm in size, the aperture of the filter mesh can be 0.1-0.48 mm, namely 2.5-6 times of unilateral or bilateral sliding gap. In this condition, the solenoid valve can work normally.
Due to the special structure, the solenoid valve has rather high requirements to the medium cleanliness. In order to prevent impurities from entering solenoid valves, strainers or Y-type filters are usually installed in front of solenoid valves. The standard of filter mesh is usually calculated by the mesh number.
The so-called mesh number refers to the number of meshes in a square inch of filter area. For example, there are 80 meshes in a square inch filter, then the filter is 80-mesh. The more meshes in a square inch of filter area, the higher filter precision is, and finer impurities can be filtered. Conversely, the less meshes in a square inch of filter area, the less meshes, the lower filter precision is, and only larger impurities can be filtered.
The 80-mesh filter mesh can filter out impurities larger than or equal to 0.18mm in diameter, but those smaller than 0.18mm can’t be filtered out. A proper filter mesh can be selected according to actual conditions.
In summary, we suggest to select a 80~120 mesh filter for the solenoid valve when the medium is water and other liquids; select a 100~200 mesh filter for the solenoid valve when the medium is air or steam.
The solenoid valve has no stuffing box inner chamber, and the valve’s working parts contact with the medium directly. The cleanliness of medium directly affects the reliable operation of solenoid valve working parts. Sliding clearance of the moving iron core is directly related with the cleanliness of medium. Particularly, if there’s a sliding gap in the spool of main valve, the massive long-term accumulated impurities in the gap directly determines whether the solenoid valve can work reliably or not. Therefore, we should consider the filtering precision from the sliding gap, especially from the sliding gap of the main valve.
It is tested that when the aperture of the strainer is 0.125 mm, the size of impurity particles in the hydraulic system with a working pressure less than 14.0MPa is 0.025-0.05 mm. The mesh filter is mounted on the suction pipe with the aperture of 0.8~1.3mm. After filtration, size of common particles are 0.13~0.4mm.
Therefore, it’s assumed from the concept of probability that, if most of the impurity particles in filtered media are not larger than 0.04-0.08mm in size, the aperture of the filter mesh can be 0.1-0.48 mm, namely 2.5-6 times of unilateral or bilateral sliding gap. In this condition, the solenoid valve can work normally.
Due to the special structure, the solenoid valve has rather high requirements to the medium cleanliness. In order to prevent impurities from entering solenoid valves, strainers or Y-type filters are usually installed in front of solenoid valves. The standard of filter mesh is usually calculated by the mesh number.
The so-called mesh number refers to the number of meshes in a square inch of filter area. For example, there are 80 meshes in a square inch filter, then the filter is 80-mesh. The more meshes in a square inch of filter area, the higher filter precision is, and finer impurities can be filtered. Conversely, the less meshes in a square inch of filter area, the less meshes, the lower filter precision is, and only larger impurities can be filtered.
The 80-mesh filter mesh can filter out impurities larger than or equal to 0.18mm in diameter, but those smaller than 0.18mm can’t be filtered out. A proper filter mesh can be selected according to actual conditions.
In summary, we suggest to select a 80~120 mesh filter for the solenoid valve when the medium is water and other liquids; select a 100~200 mesh filter for the solenoid valve when the medium is air or steam.
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