Normally open and normally closed has nothing to do with the valve, but rather defines the position of the contact within the switch relative to common to the output leads.
On Mon, Feb 17, 2014 at 3:49 PM, Charles Thurston <[email protected]>wrote: > Hello Forest, > > Then the valve is opened all but the last 2 turns before you get a signal. > The switch transfers on the open side of the valve. > > Monday, February 17, 2014, 5:17:29 PM, you wrote: > > > Just Change it from NO to NC when you connect the contacts > > > > Forest Wilson > > Fire Sprinkler Contractor > > 937-736-0425 > > > Notice: > > This message is confidential. It may also be privileged or > > otherwise protected by work product immunity or other legal rules. > > If you have received it by mistake, please let us know by e-mail > > reply and delete it from your system; you may not copy this message > > or disclose its contents to anyone. Please send us by fax any > > message containing deadlines as incoming e-mails are not screened > > for response deadlines. The integrity and security of this message > > cannot be guaranteed on the Internet. > > > -------- Original message -------- > > From: John Denhardt <[email protected]> > > Date:02/17/2014 4:56 PM (GMT-05:00) > > To: [email protected] > > Subject: RE: Butterfly valve, monitered or not? > > > Wait a second. > > > It looks like the NFPA 20 committee cleaned this section up in 2013 > > and now allows (thanks Chris for the post) > > > (3) Locking valves open > > (4) Sealing of valves and approved weekly recorded inspection where > > valves are located within fenced enclosures under the control of the > owner. > > > That makes more sense. We were locking them open for years. > > > The point is that these control valves do not affect the system > > operation. The worse that could happen is the piping or test header > valves would freeze and break. > > > About three years ago, the industry (NIBCO and Victaulic that I > > remember off the top of my head) have started providing normal > > closed butterfly valves that are correctly supervised to operate > > within 2 turns from closed. While these valves are available, they > > cost more than a normal butterfly valve. > > > John > > > > John August Denhardt, P.E., FSFPE > > Strickland Fire Protection Incorporated > > 5113 Berwyn Road > > College Park, Maryland 20740 > > Office Telephone Number: 301-474-1136 > > Mobile Telephone Number: 301-343-1457 > > FIRE SPRINKLERS SAVE LIVES - Can you live without them? > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of > [email protected] > > Sent: Monday, February 17, 2014 4:44 PM > > To: [email protected] > > Subject: RE: Butterfly valve, monitered or not? > > > Agreed. Most normally closed valves cause something else to happen > > when opened (start a pump or dump a deluge system) and that > > something else is usually alarmed.. > > > Ron F > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of > John Denhardt > > Sent: Monday, February 17, 2014 2:21 PM > > To: [email protected] > > Subject: RE: Butterfly valve, monitered or not? > > > Agree. However, this is similar to a fire pump test header control > > valve. The NFPA 20 committee thought it was important enough to > > supervise the fire pump test header valve. To me, this is a > > wasteful requirement but it is a requirement. We need this requirement > changed. > > > John > > > John August Denhardt, P.E., FSFPE > > Strickland Fire Protection Incorporated > > 5113 Berwyn Road > > College Park, Maryland 20740 > > Office Telephone Number: 301-474-1136 > > Mobile Telephone Number: 301-343-1457 > > FIRE SPRINKLERS SAVE LIVES - Can you live without them? > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of > Brad Casterline > > Sent: Monday, February 17, 2014 4:07 PM > > To: [email protected] > > Subject: RE: Butterfly valve, monitered or not? > > > Douglas, > > > Search the archives for 'full forward flow test control valves'. > > lots of good stuff and fairly recent. > > brad > > > -----Original Message----- > > From: Douglas Hicks [mailto:[email protected]] > > Sent: Monday, February 17, 2014 2:58 PM > > To: [email protected] > > Subject: Butterfly valve, monitered or not? > > > I am going to install a 4" butterfly valve on a sprinkler manifold. > > This will give us an outlet to perform a Forward Flow. Does the > > valve need to be monitored or will it be OK to use a chain to lock the > valve in the closed > > position? > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > > -- > Best regards, > Charles Thurston mailto:[email protected] > Systems Design Manager > NICET Certified > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) A problem well stated is a problem half solved. -Charles F. Kettering, inventor and engineer (1876-1958) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
