[Equest-users] Secondary Loop Valve Type

[David Berty via Equest-users]

Darryl,
A three-way valve will maintain constant total branch or loop flow by
modulating the flow to either the coil or directly to the return line. A
two-way valve will modulate open or closed to maintain a flow or
temperature (usually leaving air temp), as it closes it will reduce the
total loop or branch flow proportionally. 3 way valves are not generally an
acceptable choice because they run counter to the desire to reduce flow to
reduce energy consumption. These valves are usually at the coil but can be
at the primary secondary interface they perform the same function in
general at either location. Smaller systems that might lack sufficient
diversity to ensure a minimum level of system flow sometimes use these
valves to ensure that the pumps don't "dead-head".

David Berty, P.E.
Baseline Energy Consulting
317.220.9272

On Aug 23, 2016 2:17 PM, "Darryl Kasun via Equest-users" <
equest-users at lists.onebuilding.org> wrote:

> Hi eQUESTers,
>
> For a secondary loop, there is an input for valve type - either three way
> or two way.  Can anyone provide a schematic or quick explanation of the
> difference between how these two valves control the flow from the primary?
> Is this input assuming there is a valve at the secondary loop connection?
> If there is a simply a tee at the secondary connection, can the valve head
> input be zero?
>
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