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O' PW 61 TNG OVERFILL PREVENTION VALVES Operating Principle • Integrated Adaptor-The 61TNG-4000 has its own built-in The 61 TNG operates using a venturi adaptor reducing space requirements mechanism similar to an automatic in the spill container and over-all 'cF gasoline nozzle.Product flow through costs while simplifying installation. NG'. a suction tube generates a vacuum that The 61TNG�100 has a threaded top I,.; initially supplied through a sensor to accommodate a separate tight fill tube that extends into the tank.The adaptor. (Tire height of the separate sensor tube is cu[at the desired shut- adaptor may preclude the use of the off level.Once the product level reach- 61TNG-4100 in some shallow bucket es the tip of the sensor tube,the vacuum is redirected behind a spill con[ainers. See clearance i �1diaphragm.Diaphragm movement,in requirements on next page.) turn,operates a cam that moves the •Complete Unit -The TNG is a com- 1 poppet into [he flow stream.The prod- plete package that is prc-assembled. uct flow then closes the valve.The It comes out of the box ready to valve remains closed until the head install. (61TNG-1001/4101 are sup- pressure is relieved. The shut-off plied with lower tubes for new instal- process is repeated each time delivery lations.) into a full tank is attempted. ♦Automatic Operation-The TNG operates automatically without the Features include: need for driver intervention. ♦ Easy Installation-Requires attach- Compared with ball floats,flow is ing and cutting the lower drop tube unrestricted and continues urtimped- OPW 61TNG-4000 and one cut of the sensor tube at the ed until the shut-off point is reached. desired shut-off level.The 61TNG ♦Allows For(Maximum Filling Of threads directly into a thread-on Tank -The shut-off point can be set spill container, at any level up to 99%of tank capac- * Minimal Flow Restriction - icy.The precision repeatability pro- Straight through flow path ensures a vides for maximum tank:fill while neglible effect on flow rates and maintaining a dry tank top as pre- scribed by EPA regulations. drop times. ♦ Minimal Maintenance- Due to the Important mechanism's location (in the spill container) and the minimal number In order to prevent product spillage of moving parts,maintenance,if from the Underground Slot- , Tznk required, is simple.A flanged joint (UST),properly maintained delivery allows the entire unit to be easily equipment and a proper connection at removed for tank testing without the tight fill adaptor are essential. ever breaking the threaded joint in Delivery personnel should be managed the spill container. and trained to inspect delivery elbows and hoses for damaged and missing ♦ Quick Drain Time-After shut-off, partsThey should always make certain the valve is held closed by the head there is a positive connection between pressure of the product.Once the the adaptor and elbow.If delivery truck valve is closed and the head equipment is not properly maintained, pressure is relieved,the valve opens or the elbow is not securely coupled to automatically. Hose walk-down can the adaptor-a serious spill may result begin immediately. when the OPW 61TNG closes-causing Immediate Tank Sticking •The a hazard,and environmental contamina- fast drain feature alloWs a driver to tion. stick the tank immediately after the Note:The OPIV 61TNG Overfill hose is emptied. Prevention Valve is not to be used in pumping applications.The 61TNG is designed only for tight fill.gravity drop applications. P t [5131610 3II9• d0())1u•2525.kL t513 d1a9t •