We have upgraded several dry valves to the DPV-1 valve. They trip faster, & use less air pressure. Normally, we do not use the inspectors by-pass valve, doing a full or partial trip instead. Does there seem to be a problem when doing a full or a partial trip?
When you clean the orifice, do you use a screwdriver or a brush to remove the water deposits? From: Scott Futrell Sent: Saturday, April 15, 2017 7:36 AM To: [email protected] Subject: Tyco DPV-1 Dry valves To any of you that do IT&M on these dry valves that were manufactured sometime between 2003 and current (I don’t know the exact timeframe yet), we took the second one apart that has had the two small orifices in the back, in the ¾’ alarm port, plugged. When these are plugged water doesn’t flow to the pressure switch and no waterflow alarm signal is sent. If you are doing annual IT&M on Tyco dry valves I would recommend you take the ¾” trim apart in the back and thoroughly clean these two small orifices and the small slot intermediate chamber leading to them. I understand this is not easy or quick, but using the alarm bypass test generates the waterflow signal from the pressure switch and waterflow through the alarm port, during dry pipe valve operation, will not generate the signal if the orifices are plugged. It is my understanding that Tyco has not issued any technical advice on this, but that may be wrong. I’ve been told they haven’t by others. I can provide more information offline if interested. Scott Office: (763) 425-1001 x 2 Cell: (612) 759-5556 -------------------------------------------------------------------------------- _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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