Sieves are also used to separate stones from sand. Depending upon the types of particles to be separated, sieves with different types of holes are used. Coarse particles are separated or broken up by grinding against one-another and screen openings. A sieve such as used for sifting flour has very small holes. Is a simple technique for separating particles of different sizes. The self-cleaning strainers or filters are more efficient and provide an automatic filtration solution. Most processing industries (mainly pharmaceutical, coatings and liquid food industries) will opt for a self-cleaning strainer instead of a basket strainer or a simplex strainer due to limitations of simple filtration systems. Some commonly used strainers are bell mouth strainers, foot valve strainers, basket strainers.
Simple basket strainers are used to protect valuable or sensitive equipment in systems that are meant to be shut down temporarily.
Some industrial strainers available are simplex basket strainers, duplex basket strainers, and Y strainers.
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