Peop`le have told me that conreol valves such as butterfly or globe valves should nor be installed vertically, however no one has been able to explain why. Can anyone please explain?The recommendation is from long ago and is based on the fact that the predominate type of "Control Valve" was the Diaphram operated Globe pattern control valve. Their reasoning for this was that the operating shaft would be in a horizontal position (not vertical) and would suffer uneven wear and could bind the "plug" on the side of the cage.Today there are many different types of valves used as a "Control Valve" including some that do not suffer the same weaknesses. Butterfly valves, for example (manual or with an operator) will work just fine in th horizontal position. Some of the newer Globe pattern control have "Bottom Guided" plugs that may reduce the binding problem and work in the horizontal position.pennpiper pointed out that there are control valves that operate just fine in a vertical orientation; however, he did not say that all control valves would be ok for that arrangement. At a minimum, the sliding contact faces (guides, etc.) are constructed from a harder, more wear resistant material.That being said, the valves you bought may be perfectly capable of vertical installation, but the vendor should be consulted. As a general rule, control valves should not be oriented vertically and, unless otherwise specified, the vendor most likely assumes horizontal orientation. Do not take pennpiper's good advice as an over generalization that all valves can be installed in that manner.

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