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Slurry Pinch Valves and Materials in Industry
Slurry Pinch Valves and Materials in Industry
Details of industrial pinch valves operated by air, including applications, uses, construction and design.
Daventry,
Northamptonshire,
United Kingdom
(pr4links.com)
14/07/2011
A primary consideration for any user and manufacturer of a pinch valve is to ensure that the valve and material to be processed are compatible. Without this combination, there may be a severe affect on the flow material, resulting in damage, costly downtime and dispute between user and supplier. Therefore, it is a necessity that there is an exchange of information between user and valve supplier, regarding all aspects and properties of the proposed material.
Selecting the appropriate pinch valve for an application requires specific information which affects the design of the valve, size and type of service it will perform related to the slurry to be processed. Part of this equation will be factors relating to pressure and temperature configuration of the flow path and system layout.
The selection of a suitable type of pinch valve will involve considerations such as isolation, changeover, regulating, mixing and non-return and safety aspects. While many valves of a standard design are not suitable for slurry applications, there are some that can be utilized with some success in non-abrasive slurry installations. A general rule is that a valve is selected with considerations, based on detailed knowledge of the slurry properties. There is not a safe limitation in respect of the concentration of solids, which will produce non-abrasive slurry by the use of hard, angular solids.
The manufacturers of slurry pinch valves have varied design principles for their components. Therefore, respective valves from manufacturers for a particular application may have significant differences. For example, the diameter of the flow port of a valve may differ in the size suggested by the nominated pipe. The successful operation of a pinch valve is dependent on the accuracy of the available information.
The properties of the materials in direct flow-contact, will determine whether the slurry is abrasive or non-abrasive and accordingly, will help in the selection of a slurry pinch valve. A standard valve is in general, manufactured from material of a relatively soft nature. However, the exception to this rule can apply to specialized applications, such as those connected with oil field installations where the valves are made from harder compounds. Modification of many standard valves is possible with the use of coatings or linings, which will increase their resistance to abrasion and erosion.
The velocity of slurry is a primary factor in the consideration of wear and the loss of material which are directly proportional. The processing of slurry by means of a pump application, render the rate of wear extremely variable, with a general increase in the proportion to velocity. This will also include the wear on pipes, which has correlated as directly proportional to velocity. Therefore, the related importance of the correct slurry valve for a particular application cannot be underrated.
The testing of slurry, for the determining of the correct slurry valve, can be a complicated and costly process. Non-flowing tests may provide inaccurate results due to the nature of the sample. Erosive testing by the use of slurry jets is reputed to have given reliable data. ‘Slurry jet test rigs’ have the capacity to provide a ‘once through’ or recirculation facility. While attrition may not be a contributing factor, erosive testing has revealed that the hardness of the processed material is a significant factor regarding abrasion and erosion.
For further information, please visit www.pinch-valve.com.
About
AKO UK Ltd has been established since 1998 and distributing their leading product, the Pinch Valve, into industrial markets and industries with great success.
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