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Low Lead Type NL300L and NL310WJ Air Volume Controls

Low Lead Type NL300L and NL310WJ Air Volume Controls
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Low Lead Type NL300L and NL310WJ Air Volume Controls - 1

^USC U.S. Gauge Product Data SPECIAL APPLICATION GAUGES SPECIFICATIONS NL310WJ U.S. Gauge low lead air volume controls adhere to the “Reduction of Lead in Drinking Water Act” enacted by the U.S. Congress January 2011. U.S. Gauge low lead air volume controls are designed for potable domestic water supply systems which deliver a quantity of air to the pressure tank with each cycle of pump operation. Insufficient air in the pressure tank causes frequent operation of the pump. Too much air in the pressure tank will permit large bubbles to be carried into the piping system. This causes a disagreeable noise and sputtering at the faucets. It is the function of U.S. Gauge air volume controls to maintain the correct relationship between the volume of air and the quantity of water in the pressure tank. SPECIFICATIONS NL300L HOUSING: Die cast zinc, with 1-1/4 - 11-1/2 ANPT male connection for tank installation, and 1/4-18 ANPT female connection to accept a U.S. Gauge Model P-500 pressure gauge, 1/4-18 ANPT, LM connection HOUSING: Die cast zinc, with 1-1/4 - 11-1/2 ANPT male connection for tank installation, and 1/4-18 ANPT female connection to accept a U.S. Gauge Model P-500 pressure gauge, 1/4-18 ANPT, LM connection MAIN VALVE: Brass stem with a neoprene seat, float actuated RELIEF VALVE: Brass, spring loaded pressure actuated Manually adjustable between 15 and 40 psi. Stock units preset at 25 psi FLOAT: Plastic bulb, mounted on a solid, low lead brass rod DEEP WELL OPERATION - Type NL310WJ When there is an excess of air and the water level is low, the float opens the main valve of the control, permitting air to be vented to a chamber within the control. This chamber contains an adjustable pressure relief valve which exhausts the excess air to the atmosphere, providing the pressure in the tank is higher than the relief valve setting. 4s the float rises with the increase in water level the main valve closes, trapping the remaining volume of air in the tank. The optimum relationship between the volume of air and water in the tank is thus maintained. AIR INLET VALVE: Schrader or Dill type valve is mounted in the hose connection FLOAT: Plastic bulb, mounted on a solid, low lead brass rod INTERNALS: A flexible, molded neoprene plug of unique design acts as both dividing wall and fulcrum through which float action is transmitted to the air inlet valve SHALLOW WELL OPERATION - Type NL300L When the water level is high, the float, secured to a float rod extending through a flexible dividing wall, opens an air inlet valve in the body of the control. The air inlet valve is connected through 48" long polyethylene tubing to a snifter valve on the pump and has no direct connection into the tank. The snifter valve admits air into the pump but prevents the water in the pump from escaping back through it. Air is drawn into the pump through the air inlet valve, connecting tubing and snifter valve and carried out with the water into the tank. This operation continues until the volume of air increases to the proper amount, at which time the float closes the air inlet valve, shutting off the supply of air to the pump. The optimum relationship between the volume of air and water in the tank is thus maintained. Spec Number Selection Chart Model NL310WJ (shown with 162988NL, Low Lead Model P-500 pressure gauge - sold separately) AMETEK' On-line order fax: +1215-323-9450 or e-mail: usg.sales@ametek.com Sales/Technical Support: +1 215-293-4100 I 205 Keith Valley Road I Horsham PA 19044 U.S.A. © 2013, by AMETEK, Inc. All rights reserved. Printed in the U.S.A. PDF513 (160174) Specifications are subject to change without notice. Visit our Web site for the most up-to-date information.

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