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We need to identify with a short document, not more than 3 pages, which are the mandatory parameter to be given to select a manually gate valve to be used in christmas tree installation, referring to API 6A or any external document (NACE, publications, papers etc etc).
Some parameters are obvious: dimension, rising stem, pressure, other (as charateristic of oil for example) less.
We expect to receive a short description, a table (data sheet) with the needed parameter to select the correct valve and for each parameter an explanation of what influence the choice and reference to external bibliography
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