Micro-Metering Valves > 크로마토그래피

Micro-Metering Valves
 

For fine control of fluid flow rates, Micro-Metering Valves can reduce outgoing flow to as low as 3.5 µL/min*. These needle valves are perfect for use with peristaltic pump fluidtransfer applications, mass spectrometry, and fraction collection. Our Micro-Metering Valves can also be used to regulate gas flow in helium sparging lines and as a flow-dependent variable back pressure regulator. For flow independent regulation of back pressure, please see page 149. Flow path materials are PEEK polymer and PTFE. All versions of this valve have 0.020” (0.50 mm) thru-holes. 

- Flow rates as low as 3.5 µL/min*

- 1/4-28 flat-bottom and 10-32 coned designs available

- Materials of construction: PEEK, PTFE 

* At 1.0 mL/min incoming flow rate with room temperature water

Back Pressure Considerations 

The Micro-Splitter Valves are designed to work when both effluent flow path pressures are nearly identical. However, the split flow path will often have higher back pressure than the waste flow path, making it hard to achieve any split flow at all. There are two possible solutions. Place a back pressure regulator (page 145) on the waste flow path that is equal to or slightly greater than the pressure on the split flow path. Or, 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. (Please Note: This second method may result in a loss of adjustment sensitivity.)

Multi-Column and Detector Systems 

Does your work require analyses with multiple columns and detectors that use the same mobile phase? If so, 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.