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Anti-Scale Valves
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By: Dr.-Ing. Dirk A. Lindenbeck. |
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In various industries there are valve applications where the standard valves used
do not function satisfactorily. When scale is formed on the moving elements of ball
valves or gate valves the consequence is either blocking of the valve movement or
damage to the valve seats and consequent leaking through the valves. |
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A development of AS Stargate-O-Port® valves was carried out in 1995, which lead
to a good performance in pulp manufacturing. Later the same principle was used in
the food industry. The most impressive application was in mining, where standard
valves had to be exchanged every two weeks, whereas the Anti-Scale valves are in
operation now for three to four years without any need for refurbishment. The increased
production by eliminating downtime has paid many times already for the investment
in the valves. |
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Contents |
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1.
Introduction
2.
Stargate-O-Port® Valves
3.
AS-Stargate-O-Port® Valves
4.
Advantages over different Valve Types
5.
Applications |
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Introduction |
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Stargate-O-Port® Valves |
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In applications of valves in the process industry there are many challenges to be
met, corrosion, abrasion, pressure shock waves, temperature shocks just to mention
a few. Less frequently but often with more critical consequences an effect is found
in scale formation in valves. Another problem is the dealing with sticky flow media.
Both these effects usually lead to problems with the performance of valves and often
also have a severe effect on the safety of personnel. |
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The consequences of these effects are often damage to the valve seats when the valves
are actuated, which then leads to leakage through the valves. Deviation in the process,
inconsistent quality of the produced material, loss of energy and increased production
cost are the result. |
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The most critical consequence may be experienced when the valves cannot be operated
at the required time. This can lead again to inconsistent quality of the produced
material, possibly loss of a major amount of product and even worse possibly hurting
persons when the valves have safety functions. |
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In any case the affected valve applications have to be analyzed and solutions to
be found in order to minimize the effects of scaling and sticky materials. |
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Stargate-O-Port® Valves |
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