Fine control needle valves provide precise flow control of all laboratory gases. They are used where precision metering of flow and higher working pressures are involved. Valves are individually tested at 375 PSI nitrogen pressure and are rated for use at working pressures up to 250 PSI. Features of these valves include:
Replaceable stainless steel seat threads into valve body. While the valve seat is easily replaced, there is rarely a need to do so since the valve improves with use.
Floating stainless steel needle self- centers on valve seat. As the valve is used, the needle and seat form a matched fit, making the valve easier to open and close. The valve actually “improves with age.”
Fine stem threads for good metering of flow. Valve goes from closed to fully open in 2 full revolutions of the handle.
Where used for oxygen and other pure gases, valves are specially cleaned, lubricated and packaged to maintain and enhance the purity of the media. Please refer to WaterSaver standard procedure “Cleaning for Pure Gas Systems” for further information.
Molded PTFE stem packing with adjustable packing nut. Packing seals valve stem into body. Adjustable nut permits take-up of wear, virtually eliminating the need to ever replace packing.
Valves are available in both brass and Type 316 all-stainless steel construction.
Fine Control Needle Valve Flow Chart
Note: Flow rate is based upon valve with serrated hose end installed. Flow rate may vary if other type of outlet fitting (e.g. quick connect, compression fitting, etc.) is installed.