Relief Valve Discharge - SPRINKLER TALK FORUM
Model 375, 375A, 475 & 975 Reduced Pressure Principle & Reduced Pressure Detector Backflow Preventers
®
a
®
company
SPECIFICATION SUBMITTAL SHEET
ZONE PRESSURE (U.S. PSIG)
Relief Valve Discharge Rates
200
(Worst case condition- If 1st check or relief valve is lodged wide open) Model 375, 475 & 975 RP & RPDA Backflow Preventers 1/4-1/2"
2 1/2-6"
1 1/4-2"
8-10"
3/4-1"
150 100 50 0
0
200
400
FLOW RATE (U.S. GPM)
GENERAL INFORMATION Reduced Pressure Principle Backflow Preventers can and will discharge water. For indoor installations, pit or vault installations or protective enclosures, a drain needs to be provided that can handle the amount of water discharged. This chart shows the maximum amount of water that can be discharged from the device based on the line pressure where it is installed. Rarely will a device discharge this amount of water, but if it does happen, it can cause flooding, building damage or a cross-connection that can contaminate the water supply. Therefore a drain MUST be sized properly. WILKINS shall not be responsible for damage caused by the lack of a drain or an undersized drain.
600
800
TYPICAL INSTALLATION
Electric Solenoid Timer
12" MIN. 30" MAX.
To reduce the risk of water damage due to relief valve discharge, specify the WILKINS Model 375MS. For additional information, send for BF-375MS, BF-375AMS BF-475MS&VMS, BF-475&VMS212&3 and BF-EST.
375MS with ZW106 Solenoid Control Valve and EST Electronic Solenoid Timer DOCUMENT #: BF-RV DISCHARGE
REVISION: 4/12
WILKINS a Zurn company, 1747 Commerce Way, Paso Robles, CA 93446 Phone:805-238-7100 Fax:805-238-5766 In Canada: ZURN INDUSTRIES LIMITED, 3544 Nashua Dr., Mississauga, Ontario L4V 1L2 Phone:905-405-8272 Fax:905-405-1292 Product Support Help Line: 877-BACKFLOW (877-222-5356) • Website: http://www.zurn.com
®
a
®
company
SPECIFICATION SUBMITTAL SHEET
ZONE PRESSURE (U.S. PSIG)
Relief Valve Discharge Rates
200
(Worst case condition- If 1st check or relief valve is lodged wide open) Model 375, 475 & 975 RP & RPDA Backflow Preventers 1/4-1/2"
2 1/2-6"
1 1/4-2"
8-10"
3/4-1"
150 100 50 0
0
200
400
FLOW RATE (U.S. GPM)
GENERAL INFORMATION Reduced Pressure Principle Backflow Preventers can and will discharge water. For indoor installations, pit or vault installations or protective enclosures, a drain needs to be provided that can handle the amount of water discharged. This chart shows the maximum amount of water that can be discharged from the device based on the line pressure where it is installed. Rarely will a device discharge this amount of water, but if it does happen, it can cause flooding, building damage or a cross-connection that can contaminate the water supply. Therefore a drain MUST be sized properly. WILKINS shall not be responsible for damage caused by the lack of a drain or an undersized drain.
600
800
TYPICAL INSTALLATION
Electric Solenoid Timer
12" MIN. 30" MAX.
To reduce the risk of water damage due to relief valve discharge, specify the WILKINS Model 375MS. For additional information, send for BF-375MS, BF-375AMS BF-475MS&VMS, BF-475&VMS212&3 and BF-EST.
375MS with ZW106 Solenoid Control Valve and EST Electronic Solenoid Timer DOCUMENT #: BF-RV DISCHARGE
REVISION: 4/12
WILKINS a Zurn company, 1747 Commerce Way, Paso Robles, CA 93446 Phone:805-238-7100 Fax:805-238-5766 In Canada: ZURN INDUSTRIES LIMITED, 3544 Nashua Dr., Mississauga, Ontario L4V 1L2 Phone:905-405-8272 Fax:905-405-1292 Product Support Help Line: 877-BACKFLOW (877-222-5356) • Website: http://www.zurn.com
