Coffee with Caleffi™, is an online technical training webinar and is intended for contractors, designers and wholesalers.
Flow coefficient (Cv) is a relative measure of a device’s efficiency at allowing fluid to flow. How is Cv used in a hydronic or plumbing system? Bob “Hot Rod” Rohr, Caleffi training and education manager, is at the head-of-the-class on Thursday, April 24 at 12 noon CDT. Listen in as Bob explains the following during the one-hour long webinar:
– How are pump sizing and component Cv related?
– What offers more flow resistance: a 1” balancing valve with a Cv of 12, or a 3/4″ air separator with a Cv of 12?
– My thermostatic mixing valve has a Cv rating of 3? Does that mean I can only run 3 gpm through it?
– Why do you say a fixed orifice type balancing valve has a constant Cv, and a variable orifice type valve has changing Cv?
– What does rated Cv mean?
– Why are zone valve Cv and close-off pressure rating inversely related?
– Caleffi radiant manifolds have a “combined supply & return” Cv of 1.23. Do I use this for pump sizing?
– What is the role of a fluid’s specific gravity on Cv? How do I use this information?
– Are there products whose Cv value varies when operating conditions change? When do I need to be aware of this?