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View Full Version : Cracked Dv100's


londonrain
11-05-2007, 06:25 PM
As promised a video of Dv100's that are cracked.....We do not have freezing temps in my area that crack valves and some have said it must be from MA over tightened. The video shows just how loose the valves are so it is not from over tightened MA.

CLICK ON LINK FOR VIDEO SHOWING HOW LOOSE THE MA ARE....
http://webpages.charter.net/nixdiecast/dv.MOV



Why we get so many cracked dv100 in my area I don't know but I know I replace a lot of them and they all have cracks in the same area's 90% of the time. Both of these valve actually have three cracks , two on either side and one in the middle.

First cracked dv
http://webpages.charter.net/nixdiecast/crack1.bmp
second cracked dv
http://webpages.charter.net/nixdiecast/crack2.bmp

The manifold was so tight the only way I could get the valves out were by taking the tops off and threading another dv body back in its place and then reassembling the valves.
http://webpages.charter.net/nixdiecast/dv1.jpg
dv out

http://webpages.charter.net/nixdiecast/dv2.jpg
second dv out



http://webpages.charter.net/nixdiecast/dv3.jpg
Dv's back in place....

CAPT Stream Rotar
11-05-2007, 06:59 PM
Epic video/pictures...

London is putting down the facts and backing them up..

Nice work all around....

hoskm01
11-05-2007, 10:01 PM
Nice pics London. Havent seen the same problems here with the DV100, but I feel for you. Good repairs though.

FIMCO-MEISTER
11-06-2007, 07:57 AM
Nice pics London. Havent seen the same problems here with the DV100, but I feel for you. Good repairs though.

Ditto. I also don't get any cracked DV100 bodies but our water pressure is not as high as yours. Think this might be the cause? Do the cracked DV100s appear in manifolded valves situations? I'm wondering if the other valves shutting down is affecting the integrity of the valves next to them. Our valves are scattered individually throughout the yard. In the early days of the DV100 they had diaphragm and weeping solenoid problems but we use the DVF as our base repair valve because of reverse flow and it shuts down under very low flows. We used to rely solely on the 205F. Hope you get an answer to this someday.

DanaMac
11-06-2007, 09:16 AM
Ditto. I also don't get any cracked DV100 bodies but our water pressure is not as high as yours. Think this might be the cause?

This would've been my response as well. High pressure. I have had that same crack happen to DVs before, and it was when the system had no PRV. Sure they may be rated at 150 psi or so, but the water hammer at time of closing can cause that. And DVs close very fast in regards to other valves. I hear more hammer with DVs than other valves.

hoskm01
11-06-2007, 10:52 AM
And DVs close very fast in regards to other valves. I hear more hammer with DVs than other valves.



Big DITTO on both.

irrig8r
11-06-2007, 01:09 PM
I've used more ASVFs than DVFs. The ASVF has always been a noisy valve, and I've learned not to locate them near a bedroom wall...but as far as water hammer goes, only problem I've had is when the static pressure is high, like 80 PSI or higher, and the flow control hasn't been dialed down enough.