valve question This topic contains 1 reply, has 2 voices, and was last updated by John C 2 months ago. Author Posts May 13, 2019 at 4:07 pm #10236 amir shaikParticipant When would I need to use something other than a ball valve in my HVAC application? May 16, 2019 at 7:54 am #10243 John CGalco Representative Well, Ball valves are limited in size (up to 2″ pipe), and are better at on or off rather than flow control. They can provide flow control it’s just not very precise. Author Posts You must be logged in to reply to this topic.