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  1. #1
    Join Date
    Nov 2006
    Location
    Desert Southwest
    Posts
    719

    Control Valve Cv question

    If an existing control valve (let's say Globe Style sized for 240 GPM) that has a DP of 5psi is replaced with a valve of a lower Cv resulting in a higher calculated valve DP of 7psi will this have a significant reduction in the ability of the cooling coils ability to achieve full cooling?
    If so can the circut setter be adjusted to compensate for it?
    If you can't fix it with JB Weld, Duct Tape, and Ty Wire it has to be replaced.
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  2. #2
    Join Date
    Dec 2005
    Location
    California
    Posts
    335
    Quote Originally Posted by desert guy View Post
    If an existing control valve (let's say Globe Style sized for 240 GPM) that has a DP of 5psi is replaced with a valve of a lower Cv resulting in a higher calculated valve DP of 7psi will this have a significant reduction in the ability of the cooling coils ability to achieve full cooling?
    If so can the circut setter be adjusted to compensate for it?
    Very slight loss in cooling, unless at the very jagged edge you'll never see the differnce. But you'll get slightly better control.

  3. #3
    Join Date
    Jan 2012
    Location
    California
    Posts
    92
    We prefer Belimo CCV ball valves. The control-ability with the flow disk is pretty good for the money. I agree with control$ a pound here or there might not be a big deal. We do not like seeing circuit setters in systems because they are pressure drops that have to be overcome by the pump. We do allot of variable flow variable pressure so the goal is to have the least amount of pressure in the system to maintain the load so any circuit setters add resistance, little as it may be.

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