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Tuesday, August 19th 2003, 12:29pm

Author: SprinklerTalk

inline valves + backflow preventer or anti-siphon

<b><font color="red">Their are several types of backflow devices made:</b></font id="red"> 1. Air-Gap 2. Atmospheric (non-pressure) Type Vacuum Breaker 3. Pressure Vacuum Breaker {PVB} 4. Double Check Valve Assembly {DC} 5. Reduced Pressure Principle Assembly {RP} <b><font color="red">When to use each:</b></font id="red"> 1. Air Gap - Not Used For Sprinkler Systems: It is a physical separation of the supply pipe by at least two pipe diameters (never less than one inch) vertically above the overf...

Tuesday, August 19th 2003, 12:23pm

Author: SprinklerTalk

Pressure Drop Through Backflow Device

Craigwagner6, I recommend the double check valve assembly since your local building code requires it. See Local Code Lingo Topic: http://www.sprinklertalk.com/forum/topic.asp?TOPIC_ID=386 Both the PVB and DCA typically lose about 5 psi through the device. The DCA will lose a litle more than the PVB, but not enough to make your decision based on pressure loss through both devices. []

Tuesday, August 19th 2003, 12:11pm

Author: SprinklerTalk

Local Code Lingo

Craigwagner6, <b><font color="red">Their are several types of backflow devices made:</b></font id="red"> 1. Air-Gap 2. Atmospheric (non-pressure) Type Vacuum Breaker 3. Pressure Vacuum Breaker {PVB} 4. Double Check Valve Assembly {DC} 5. Reduced Pressure Principle Assembly {RP} <b><font color="red">When to use each:</b></font id="red"> 1. Air Gap - Not Used For Sprinkler Systems: It is a physical separation of the supply pipe by at least two pipe diameters (never less than one inch) vertically a...