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Old 10-20-2010, 03:33 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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Conversation with Griswold Controls

i spent 45 minutes with a very nice 40 year veteran in our industry who walked me through how the Griswold is able to avoid the last 20% closing problem. So I am satisfied beyond any doubt that the Griswold belongs in its own category. No other valve is built like it which is about 99% of those in use is my guess. For them the 20% closing problem still exists as well as opening surge pressure from poor valve location and installation. He also said MVs don't eliminate surge pressures which is why the top designers use N.O. no surge anticipation valves connected to a flow sensor. (model 2265)
So if you have water hammers and don't want to correct the real problems causing them then just toss in a Griswold MV with a new controller that has a zone delay feature. (I'm aware of zone delay controllers. I mentioned unless you have a controller that allows for a delay.) As for Leary opening the MV before turning on any zones doesn't seem too wise to me. You want a zone open with the MV opening or use a NO and leave the mainline charged at all times.

NOTE THE SECOND SPRING. (29) That combined with the metering pin is the key.
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Old 10-20-2010, 03:53 PM
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I don't think that "second spring" is the key, since it is supposed to provide a drain option of some sort, and the valves I've serviced did not have that spring. The 2000 does have a unique metering pin, though.
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Old 10-20-2010, 04:27 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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It is complicated. The metering pin and the pin bearing and the way it is grooved. Always self cleaning. The spring plays a role. Not like any valve I've dealt with. Almost comes across as a valve within a valve. Here is the parts list that correspond to the diagram.
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Old 10-20-2010, 04:43 PM
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Your parts list identifies the part #29 as being in the "cold weather valve" ~ what it does is slightly open the de-pressurized valve by lifting the diaphragm assembly, and allowing drainage. Kind of a relic from the days of trenching a system and pitching the pipes to drain back to the source. No question that the valve could handle cruddy pond water, in the systems I worked with.
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Old 10-20-2010, 05:11 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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Well you are the man to figure it out. Lot of friggin parts to make it do what they want it to do. Interestingly enough in the troubleshooting section when the valve quits shutting slowly time to replace the diaphragms.
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Old 10-20-2010, 05:21 PM
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In the end, it's still a diaphragm valve, and the diaphragm material wasn't much (if any) different than what a common Richdel valve had.
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Old 10-20-2010, 05:23 PM
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Mike Leary Mike Leary is offline
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Quote:
Originally Posted by FIMCO-MEISTER View Post
As for Leary opening the MV before turning on any zones doesn't seem too wise to me. You want a zone open with the MV opening or use a NO and leave the mainline charged at all times.
Why? Since pros have been using the programmable fill delay forever without any problems, I find your comment ludicrous, at best. Most of our RM systems have NO valves, not for your unexplained reason (), but because those systems have quick-couple lines as well as zone valves. I have had problem zero with NC and NO master valves. It goes back to a proper design from the git, not some stupid ass head scratching re-do.

Last edited by Mike Leary; 10-20-2010 at 05:32 PM.
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Old 10-20-2010, 06:36 PM
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Just had a thought, Peter. How many clocks can use a N.O. master valve and shut down should there be a line break?
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Old 10-20-2010, 07:30 PM
SoCalLandscapeMgmt SoCalLandscapeMgmt is offline
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Quote:
Originally Posted by Mike Leary View Post
Just had a thought, Peter. How many clocks can use a N.O. master valve and shut down should there be a line break?
You can do it fairly easy on just about any controller with a Data Industrial Model 330-04 Relay Transmitter and an impeller type flow meter
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Old 10-20-2010, 07:33 PM
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Here's a thought - how many of you warm-weather pikers have ever seen an all-copper-and-brass system that drained back to a valve in the basement?
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