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Micro-Metering & Micro-Splitter Valves • Both Metering and Splitter valves available • Chemically-compatible construction • Multiple versions available in each style of valve • Ship complete with fittings Upchurch Scientific® Micro-Metering and Micro-Splitter Valves have been designed to offer the ability to more finely control fluid flow rates. Micro-Metering Valves For fine control of fluid flow rates, our Micro-Metering Valves – when used with a tee – can reduce outgoing flow to as low as 3.5 µL/min (@ 1 mL/min incoming flow rate with room temperature water). These needle valves are perfect for use with peristaltic pump fluid-transfer applications, mass spectrometry, and fraction collection. Upchurch Scientific Micro-Metering Valves can also be used to regulate gas flow in helium sparging lines and as flow-dependent variable back pressure regulators. For more information please request our Flow Control Valve Applications Guide. Flow path materials are PEEK polymer (valve body, needle) and PTFE (O-rings). The fittings included with the valves are manufactured from PEEK polymer only (10-32 threaded version) and PEEK and Tefzel® (1/4-28 threaded versions). All versions of these valves have .020" thru-holes. NOTE: the maximum internal volumes listed in "Compare Specs" are with the valve fully open (7.7µL for P-445 and P-447; 7.2µL for the P-446). Micro-Splitter Valves We also offer a line of Micro-Splitter Valves to accurately split and control a low-flow stream from a single incoming supply. The biocompatible Medium Pressure Micro-Splitter Valves (P-450, P-451 and P-452) are perfect for LC-MS and other multi-detector systems, fraction collectors and post column reactions. The ideal placement of these valves is on the effluent side of the detector flow cell, at a maximum pressure of 800 psi (55 bar). Choose between 1/4-28 and 10-32 threaded versions. A 10-32 / 6-32 valve (P-452) is also available to accommodate applications involving capillary tubing. The High Pressure Micro-Splitter Valves are designed to operate under pressures up to 4,000 psi (276 bar). These products are well suited for running two analytical devices in parallel. Standard versions will connect 1/16" OD tubing to each of the three available ports. The High Pressure Capillary Micro-Splitter Valve version may also be used to more easily adapt an analytical HPLC system to handle microbore applications by providing a 6-32 threaded port designed for use with our MicroTight™ fittings. Our P-470 has a graduated micrometering stem to allow repeatable settings. For more applications and other information, click here. NOTE: The two High Pressure Micro-Splitter Valves (P-460 and M-405) have either an "S" or a "T" behind their part number. The "S" indicates a stainless steel needle inside the valve, while the "T" signifies a titanium needle. If you need a high pressure, biocompatible valve, we recommend the P-460T or M-405T as titanium is a non-ferrous alternative to stainless steel or choose from one of our standard, lower pressure valves that feature all-polymer flow paths. MICROSPLITTER VALVE INFORMATION:
* The thru-holes have IDs of .020", except for the capillary versions, which have a .010" thru-hole on the split port. ** All tests conducted at a flow rate of 1mL/min using room temperature water. Micro-Splitter Valve Applications & Notes Prime/Purge Valve Air within the pump head can cause noisy pump operation and flow instability. Solve this problem by placing a High Pressure Micro-Splitter Valve or High Pressure Universal Prime/Purge Valve inline between the pump and the injector valve. You can then safely divert pump flow to a waste container at a sufficient rate to dislodge the air. To remove air from the solvent line leading to the pump, try one of our Low Pressure Prime/Purge Valves. Multi-Column and Detector Systems Does your work require analyses using multiple columns and detectors that use the same mobile phase? Install one of our High Pressure Micro-Splitter Valves after your injector. A single injection can then be split to two separate columns and detector systems, at two different flow rates. This economical set-up eliminates the need for an additional pump and injector valve, while allowing data to be obtained simultaneously. Post-Detector Interfacing Use a Low Pressure Micro-Splitter Valve to route flow exiting an initial detector to other devices, such as a mass spectrometer and a fraction collector. The valve will split and reduce the flow rate to that required for MS interfacing, while diverting the remainder of the flow to the collector (a Back Pressure Regulator may also be required for this set-up. Biocompatible Applications Please contact one of our local Distributors or Upchurch Scientific directly for more information about these products. The Impact of Back Pressure on Valve Performance Our Micro-Splitter Valves are designed to work when both effluent flow path pressures are nearly identical. To achieve this balance, calculate the anticipated back pressure along the split-flow path at the target flow rate. Then, adjust the length and inner diameter of the flow path tubing connected to the “Waste” port such that the back pressure along that flow path is equal to the back pressure created by the split flow pathway. The second alternative is to switch the two effluent pathways such that the split flow pathway is attached to the “Waste” port on the valve and the waste flow pathway is attached to the “Split” port on the valve. This second method may, however, result in a loss of adjustment sensitivity. Copyright © IDEX Corporation 2010. IDEX Health & Science is a Unit of IDEX® Corporation. | Privacy Policy |
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