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The WaterSaver Faucet Co.'s L4870F-225WSA fine control needle valve assembly is a panel-mounted system designed for precise flow regulation of laboratory gases such as nitrogen, oxygen, helium and hydrogen. The valve is specially cleaned, lubricated and packaged for use with high purity gases at no extra charge. Needle valves are for use with gases only. This valve is designed for installation when the installer has access behind the panel or drywall. For a version with a 3/8" NPT female inlet designed for installation when there is no access behind the wall see item # L4870FT-325.
The valve body is forged brass with a polished chrome plated finish. The valve unit features a floating tapered stainless steel needle and replaceable stainless steel seat. The valve goes from closed to open in 8 revolutions of the handle, providing precise flow regulation. The forged brass four-arm handle features a color-coded index disc (specify gas being used when ordering). The inlet and outlet are both 3/8" NPT female and the outlet has a removable ten-serration hose end that varies in diameter from ~1/2" down to 5/16". Each unit is fully assembled and factory tested to 325 psi (maximum working pressure is 250 psi) prior to shipment.
The valve includes a plastic index disc indicating the type of service the valve is used for. Standard options include air, carbon dioxide, gas, hydrogen, nitrogen, oxygen, and vacuum (replacement buttons are available as item # Lbutton). Additional indexing options are also available.
For deck-mounted versions see the L2870-131 series, and for double wall/panel/overhead fixtures see the L2870-141 series valves. An unmounted valve, the L2870, is also available. An on/off ball valve version of this item is available as item # L4200-158WSA.