By default tag of the valve is not placed during the valve placement and user has to annotate it separately after placement. This article will provide the steps to enable the automatic annotation of valve tag.
Check Similar helpful link on having the valve annotations on specific level:http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/17536.how-to-have-valve-annotations-show-up-in-specific-level
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