Since you can only use a vane switch in a wet pipe, and since there is no sudden inrush I think the concern was more with being too close to the main drain where there would be a sudden pressure drop that could pull the vane backwards, either damaging the mechanism or pulling the vane off the shaft.
On 2/9/07, George Church <[EMAIL PROTECTED]> wrote:
Sure you weren't thinking of a DPV or deluge? There's not a sudden inrush of water above a Alarm check. glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Minkel Sent: Thursday, February 08, 2007 6:39 PM To: [email protected] Subject: RE: WATERFLOW SWITCHES I have been told that when the flow switch is too close to an alarm valve the sudden flow can damage or tear off the vane. Just what I was told once, notta clue if it's a valid concern _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
-- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
