b'LT ENGINEERINGCATALOGOS&Y GateVault Cover w/Valves Access HatchwayWater to BuildingUL/FM Backflow PreventerSYSTEM COMPONENTS OPERATIONThe ParkUSA BackFlo Prevention System is the perfectDepending on Backflow Prevention type, the specific solution for ensuring safe water. Designed to prevent wateroperation process varies, this is described below.cross-connection, Park backflow prevention systems are economical, easy to specify, and factory-built, offering long- Single Detector Check Assemblylasting and dependable service.Used in a Class I or II application, Single Check Detector Assemblies are used where minimum hazards exist and Vault or Pad System: All backflow assembly vaults andwhere backflow assemblies are not required. The single pads are constructed of quality precast concrete, Class I,check valve is used with a by-pass detector meter across 5000 PSI @ 28 days. Pre-casting the concrete shell insuresit. See ParkUSA Model DTC. (Note that a flow alarm check that all units achieve structural and physical uniformity.and/or a single detector check are not considered an The units are structurally engineered for H-20 truck loadingapproved backflow protection method). (with H-20 cover specified) and can be buried without need for any other structural protection. The unit is of monolithicOperation: In a non-flow condition, check valves inconstruction at bottom and walls to insure against jointthe by-pass and mainline units are closed. Flows fromleakage. Each vault is equipped with an access hatchway0 to 5 GPM will flow through the bypass.and safety net for fall protection.This operation at low flow rates is accomplished by Pipe Valves & Fittings: All the equipment used within thedesigning the differential pressure drop across thebackflow assemblies are certified by one of the followingby-pass line to be slightly less than the mainlineassociations: American Water Works Associations (AWWA),check valve. Flows in excess of 5 GPM will open the American Society of Sanitary Engineering (ASSE), CSA,mainline check valve for normal flow. Double Check Underwriters Laboratories (UL), Factory Mutual (FM),Backflow Preventer.Uniform Plumbing Code (UPC), and/or the Foundation for the Cross-Connection Control and Hydraulic Research atDouble Check Backflow Preventerthe University of Southern California.Used in a Class I, II, III, or IV (low hazard) application,Double Check Assemblies are used to prevent pollutants 26 INFO@PARKUSA.COM|888-611-7275|WWW.PARKUSA.COM'