The first Tyden dry valves (the oldest I've worked on is of 1906 vintage) were spring loaded to open so the priming water literally held them closed until the air was applied. The faceplate was hinged with six bolts that slid into slots. The water was just heavy enough to hold against the spring but barely. You'd close the clapper and put a rock or brick or other heavy weight on it. You then prime it through the open faceplate, remove the weight very gently, gingerly swing the faceplate into position, slide one bolt into its slot, carefully hand tighten it, and immediately turn on the air. When you got to about five pounds with air blowing every which way out from around the faceplate edges you quickly slide in the rest of the bolts and tighten everything down. The ice trick works nice on these but usually there's a calibrated rock or brick in the valve house. Another interesting feature of these is the intermediate chamber drain port. Instead of a ball drip there was a lever with a stopper. When the clapper was down it pressed against the lever and held the stopper up opening the drain port. When the valve tripped and the clapper moved away from the lever the stopper closed up the drain. On 3/20/08, Bobby Gillett <[EMAIL PROTECTED]> wrote: > > A couple of more tricks learned from old timers; a bag of ice (without the > bag!!) or some corn meal applied like the oatmeal trick. > > Bobby Gillett > Project Manager > [EMAIL PROTECTED] > (731)-424-0130 > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Tom Duross > Sent: Wednesday, March 19, 2008 6:11 PM > To: [email protected] > Subject: RE: Dry Pipe Valve going wet > > If all this is because a DPV won't seat, try plain old oatmeal. > A handful around the clapper, prime it and it works every time. > An old timer taught me this and it's never failed. > The oatmeal will dilute should the valve ever trip and with all that > water, > be negligible. > As far as the water column, you're right but it would be a tall column. > Just 10' @ .434 would give you 4 PSI against the air side, that would hold > back 20 PSI on a 5-1 DPV. > > Tom > > If you're talking about paddle or vane type flow switches these are only > allowed in wet systems. In fact since NFPA actually defines accepted types > of systems and a wet/dry combination (I'm not talking about an auxiliary > dry > off a wet but one that is both things) is not mentioned then I'd say can't > do it at all since this is not a case of if it's not addressed it's OK. Of > course if a temporary course of action is to leave an ordinarily dry > system > wet without an alarm while repair parts were being ordered or shut it off > I'd certainly opt for the former. > > On Wed, Mar 19, 2008 at 3:21 PM, Ed Vining <[EMAIL PROTECTED]> wrote: > > > What about the alarm Pete? The valve to the WMG or pressure switch > > must be turned off after the DPV trips. One could add a waterflow > > indicator and pretend it is a shotgun riser. > > > > Ed > > > > On Wed, Mar 19, 2008 at 1:07 PM, Larrimer, Peter A > > <[EMAIL PROTECTED]> wrote: > > > Forum Members: > > > > > > If a dry pipe valve trips and "goes wet", is there any reason why you > > > couldn't leave the system piping filled with water assuming that the > > > weather is not cold enough to freeze it? I am assuming that the > > > clappers have been reset externally and that the alarm connections > > > remain dry since they don't seem to be having problems at this time. > > > > > > Why would they want to use an alarm valve in place in liew of just > > > leaving the dry pipe valve? > > > > > > Thanks in advance. > > > > > > Peter Larrimer > > > VA > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) >
-- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
