When selecting valves for HVAC and hydronic systems, first consider the application requirements and then consider the characteristics necessary to meet those requirements. The following questions provide a guide to correct valve selection: • What is the piping arrangement and size? The piping arrangement indicates whether a two-way or three-way mixing or diverting valve is needed. The piping size gives some indication of whether the valve requires a screwed-end or a flanged-end ...

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