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Vent Hole in HTHW Check Valve

Vent Hole in HTHW Check Valve

Vent Hole in HTHW Check Valve

(OP)
Just curious about a specification I just saw.  There is a control valve for a high temperature hot water heat exchanger (400 deg f at 400 psi design).  They specified a vent hole in a check valve to be installed on the outlet side of the heat exchanger.  Anyone know why?

RE: Vent Hole in HTHW Check Valve

I think it should read: "... vent hole and a check valve ..."

RE: Vent Hole in HTHW Check Valve

Two who are both guessing about this function.

Check valve and vent hole serve as a vacuum breaker for the HX. When HX cools down, shell will go below atmospheric pressure.....don't want to collapse the shell.

RE: Vent Hole in HTHW Check Valve

(OP)
Thanks, Willard3
I did not think of a vacuum breaker.  I suggest them all the time on steam heat exchangers so the condensate can drain, but it makes sense on water, too.

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