10 mpos Dead-end Flow Path Selector, Air Actuator, 4'' Standoff, 1/16'' Fitting, 0.4 mm Port, 75°C / 5000psi, for Liquid, N60/E

Selectors (multiposition valves) step incrementally through continuous revolutions, instead of switching back and forth like two position valves. (Selectors step bi-directionally with electric and universal actuators.) The preload design allows the rotor to be inspected or replaced without taking the valve off the actuator. Valves ordered with a electric actuator are permanently aligned.Valco selectors are available in five lower pressure flowpaths typically used in gas chromatography applications (most also available with the built-in purge feature), and two high pressure flowpaths suitable for high performance liquid chromatography.

SD valves select one of 4 to 16 dead-ended streams, directing it through the valve outlet to a sample valve, pressure sensor, detector, column, etc. The same configuration can also direct one stream to a number of outlets for fraction collection.

Air actuators are useful in situations where any spark could be disastrous, where heat could compromise an electric actuator, or where electricity just isn't available.