Expert ForumsInstrumentation and Control

Topic: Re: Are there limitations when installing a wafer-type butterfly valve?

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Definitely.  Always pose such questions to your valve manufacturer.  Most installation instructions focus on mechanical issues (flanges and the like), and say nothing about piping issues.  When used as a control valve, straight run pipe distances upstream and downstream are advisable (Keystone:  10D to 20D upstream; 3D to 5D downstream  Also ask about any effect of upstream piping, pumps, valves, etc., on preferred stem orientation (horizontal vs. vertical).