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0900501 Rev B 08/00) Page 2 of 6 <br />&+226,1*7+()/2:5$7( <br />STANDARD VENTURI AND FLEX-GAP <br />For standard venturi and Flex-Gap systems, the flow rate is controlled by a venturi <br />tube located within the venturi body. Venturi tubes have their GPM rating molded on <br />the side, or can be identified by color; WHITE = 1 GPM/ BLACK = 4 GPM. <br />To change the venturi tube: <br />(1) Disconnect tubing from venturi body. <br />(2) Remove venturi body. <br />(3) Push out existing venturi tube by inserting a pen up through the bottom of the <br />venturi body — see Figure 3. <br />(4) Insert the new venturi tube (for the desired flow rate) into the venturi body, <br />ensuring that it seats firmly. <br />(5) Thread venturi body back in place and hand-tighten. <br />AIRE-GAP VENTURI <br />For Aire-Gap venturi systems, the flow rate is controlled by a nozzle, deflector plate, <br />and venturi tube. These internal parts are color coded to identify their GPM rating; <br />BLUE = 1 GPM/BLACK = 3 GPM. <br />To change these parts: <br />(1) Disconnect tubing from venturi body. <br />(2) Remove Aire-Gap assembly from water valve. <br />(3) Remove existing nozzle, deflector plate, and venturi tube by disassembling the <br />Aire-Gap — see Figure 4. <br />(4) Reassemble the Aire-Gap using new nozzle, deflector plate, and venturi tube (for <br />the desired flow rate). To avoid leakage, install the rubber washer with the 3 <br />“ears” facing upwards. Hand-tighten the venturi body to the Aire-Gap body. <br />(5) Thread Aire-Gap assembly back in place and hand-tighten. <br />&+226,1*’,/87,215$7(6 <br />IMPORTANT: The dilution chart for the standard venturi and Flex-Gap is different <br />than the chart for the Aire-Gap venturi. Be sure to use the correct dilution chart for <br />metering tip selection. <br />METERING TIP SELECTION <br />For each valve in the system, install appropriate metering tip from the charts on page <br />3. Be sure the metering tip is threaded in hand-tight only. <br />CALIBRATING ACTUAL PRODUCT RATIOS <br />To easily calculate the ounces per gallon for a specific product: <br />(1) Fill a graduated cylinder or spray bottle (that has ounce markings) with product. <br />(2) Install metering tip closest to desired ounces per gallon — see dilution charts. <br />(3) Drop chemical pick-up tube into the container holding the product. <br />(4) Activate valve until chemical line is primed up to the metering tip. <br />(5) Note how many ounces (of product) are in the container. <br />(6) Activate valve again, and fill a one gallon container with water/product mix. <br />(7) Note how many ounces (of product) were used. <br />(8) You now have determined actual ounces per gallon for this product. Repeat this <br />procedure as desired for other valves and products. <br />SCREEN WASHER <br />2300812 <br />NOZZLE SCREENS (2) <br />7407211 <br />NOZZLE <br />1 GPM = 7407201 <br />3 GPM = 7407202 <br />AIRE-GAP BODY <br />7407200 <br />DEFLECTOR PLATE <br />1 GPM = 7407220 <br />3 GPM = 7407221 <br />RUBBER WASHER <br />2300781 <br />AIRE-GAP <br />VENTURI TUBE <br />1 GPM = 7407204 <br />3 GPM = 7407205 <br />O-RING <br />1500477 <br />AIRE-GAP <br />VENTURI BODY <br />7407203 <br />DE-FOAM TUBE <br />7025903 <br />Figure 4 <br />Figure 3 <br />VENTURI BODY <br />VENTURI <br />TUBE <br />PEN