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' Oct 10 06 08: 55a Elit v Contractors Inc 2094616''42 P. 1 <br /> 42�)IOVERFILL PREVENTIONEQUIPMENT <br /> 1 <br /> i Jg, <br /> i OVERFILL. PREVENTION EQUIPMENT �3 <br /> I -31 pia�,�e <br /> ' X <br /> G1SO Overfill Prevention Valves <br /> The OPW 61 SO is a two-stage shut-off valve designed to prevent the overfill of underground <br /> 1 storage tanks by providing a positive shut-off of product delivery.Models of the 61 SO are <br /> I available to meet virtually any UST application,including: two-point,coaxial,poppeted coaxial, <br /> and remote fill.The 61 SO is designed for use on tight-fill gravity drop applications only,and <br /> I can be installed in the fill riser of both new and existing underground storage tanks. <br /> I =rte <br /> i <br /> 61TNG Overfill Prevention Valves <br /> Designed for use on tight-fill gravity drop applications,the OPW 61TNG uses a venturi <br /> mechanism similar toan automatic gasoline nozzle.Product flow through a suction tube <br /> generates a vacuum that is initially supplied through a sensor tube that extends into the <br /> tank.Once the product level reaches the Up of the sensor tube,the vacuum is redirected <br /> behind a diaphragm,which operates a cam that moves the poppet into the flow stream. T <br /> Theproduct flow then closes the valve.The 61TNG is installed in the fill riser of primarily new , <br /> < ' underground storage tanks. . <br /> ' Ball Float Vent Valves and Extractor Fittings <br /> OPW Ball Float Vent Valves protrude into underground storage tanks from the Stage I vapor <br /> return riser pipe.As the tank becomes full during a product drop,the ball seats-restricting <br /> G j <br /> the flow of vapors back to the transport truck or through the tank vent As the vapors are <br /> compressed in the tank,product flow into the tank is severely restricted. <br /> `'1 ! OPW ball Boats are mounted in OPW extractor fittings to maintain access through grade- <br /> r., level manholes. <br /> rF <br /> Drop Tubes and Accessories <br /> OPW drop tubes are installed inside tank fill users to prevent fuel from contacting riser <br /> joints.Drop tubes extend close to the bottom of the tank to minimize turbulence and vapor <br /> t ? production.Tank bottom protectors are installed on the bottom of drop tubes to prevent tank <br /> bi <br /> 'rn ; erosion at the fill point. <br /> � I <br />