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For an existing antifreeze system without a backflow prevention device, what size hole is required in the check valve separating the supply and the antifreeze?
Suggested Answer: A
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If sprinklers are above the level of the water supply to the antifreeze system, a check valve with a 1/32 in. (0.8 mm) hole in the clapper shall be provided in the U-loop.
31 comments · newest first
RE
Rebecka
12 days ago
D) 1/4 in. sounds too big for a check valve.
JO
Josue
17 days ago
I’m leaning towards A) 1/32 in. Less risk of backflow.
BO
Bok
23 days ago
I feel like it could be C) 1/8 in. More flow needed.
TU
Tu
28 days ago
I think it's B) 1/16 in. Seems reasonable for flow.
KR
Kristel
1 month ago
D) 1/4 in. seems excessive. I’d go with B too.
KE
Keneth
1 month ago
A) 1/32 in. is too small for a check valve, right?
UN
Una
1 month ago
I’m leaning towards C) 1/8 in. It feels safer.
NA
Nathalie
2 months ago
I think it's B) 1/16 in. Seems reasonable.
RE
Rene
2 months ago
I just hope I remember the specs!
DE
Deandrea
2 months ago
True, but it needs enough size.
LY
Lynelle
2 months ago
But what if it clogs?
HE
Helaine
2 months ago
C seems reasonable for balance.
DE
Deandrea
2 months ago
I lean towards C) 1/8 in.
RE
Rene
3 months ago
A might be too small for flow.
LY
Lynelle
3 months ago
Why B? Isn't A safer?
RE
Rene
3 months ago
I think it's B) 1/16 in.
HE
Helaine
3 months ago
This question is tricky.
HA
Hailey
3 months ago
Why is there no backflow prevention device in the first place?
BI
Billy
4 months ago
Totally agree, 1/16 in. is the standard!
BR
Brynn
5 months ago
Wait, are we sure about these sizes?
FR
Frank
5 months ago
I thought it was 1/8 in. (3.17 mm).
GR
Gretchen
5 months ago
It's definitely 1/16 in. (1.59 mm).
LI
Lisha
6 months ago
Why is there no backflow prevention device? Seems risky!
MA
Martin
6 months ago
Totally agree with Rebecka!
SH
Shenika
6 months ago
Wait, are we sure about these sizes?
CA
Carlton
6 months ago
I thought it was 1/8 in. (3.17 mm).
RE
Rebecka
6 months ago
It's definitely 1/16 in. (1.59 mm).
CA
Camellia
6 months ago
I have a feeling that 1/4 in. is too large for a check valve in an antifreeze system, but I can't recall the exact reasoning behind it.
EZ
Ezekiel
7 months ago
I practiced a similar question, and I recall that 1/32 in. was mentioned as a possible option, but I can't remember if it was for this specific scenario.
ST
Stephanie
7 months ago
I'm not entirely sure, but I feel like 1/16 in. could be the right answer since it's smaller and might prevent backflow better.
EV
Evangelina
7 months ago
I think the hole size might be 1/8 in. because I remember it being a common size for check valves.