Really? Well I carried separate's for each valve. I had originally posted about these and the leaks we just could not find, even after flooding with 100 PSI of water. They're old central dpv's and we found leaks in the trim but still had some others. I'm using Victaulic dpv's with their amd trim assemblies and will use a good gauge to set the downstream pressure. So no check between the tank and the amd's, just checks after the air shutoff at each valve, cool. I'm wondering about soft seat checks, not much around here for brass seat checkvalves anymore, most are imported with plastic trimmed seats. Same for renewable seat shutoffs, wondering about ball valves instead. Could I omit the relief if the tank is only at 90 and the system at 13? Tom
a single air maintenance device will serve multiple systems properly isolated from each other with check valves. Thom, Try to think of the whole thing as a system. Compressor pumps into tank through a check valve and the tank itself is extended through some piping to a system (or more) made up of more of the tank in a funny shape that resembles a sprinkler system. Because you want the air in the sprinky part to be different than the air (pressurewise of course-not chemical make-up) you need a check valve to separate the two. If you have multiple sprinky parts you need air maintenance and check for each. You don't need to trap the air between the compressor check and the tank outlet from the supply pipe. _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
