Which valve should be selected by paper mill
This article introduces what valves should be used in the paper mill and the matters needing attention. In the production process flow of the paper mill, as the pipeline medium is mostly filter residue slurry, containing solid or solid-liquid two-phase medium flow medium such as fiber liquid and solid materials, such medium conditions have relatively high requirements on the wear resistance of the valve. When using ordinary valves, the valve is severely worn and frequently replaced, which brings inconvenience to the production. For such working conditions, it is recommended to use our EVP vacuum ball valve.
In any factory environment, safety is crucial, and the selection of valves is crucial. The importance of valves with proper pressure rating, temperature capacity and chemical resistance is obvious. Other safety considerations include the possibility of packing leakage, easy actuation and ergonomic design related to manual valve actuation, and the requirements for double plugging technology confined space related to locking and lockout.
Moreover, the compatibility requirement that is often forgotten in the pulping and papermaking process is the boiling (sediment removal) or solvent chemistry used to remove scale accumulation or biological growth in the pipeline. These chemicals are usually located at the other end of the pH spectrum of the process medium, so they can dissolve the precipitated scale. Valve materials compatible with process media must also be compatible with solvent chemistry.
The control valve is designed for throttling and does not normally need to provide a gas tight closure. Because seat friction can cause poor control, clearance seats can be used to reduce friction. When both control and airtight closing are required, control valve and isolation valve can be used at the same time.
Corrosion, corrosion and wear should also be considered when selecting control valves. Corrosion occurs due to deterioration caused by chemical attack. Erosion is a deterioration caused by flowing fluids. Mechanical contact between two materials can cause wear. It is common that these three factors are interrelated. The higher the fluid velocity, the greater the possibility of such damage. Proper selection of valve style, material selection, installation procedures, and system design is critical to address these potential pitfalls.
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