Selectors (multiposition valves) step incrementally through continuous revolutions, instead of switching back and forth like two position valves. (Selectors step bi-directionally with microelectric 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 microelectric 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.
Low pressure selectors
Click "select" for product numbers and information.
| Flowpath | Fittings | Bore | Positions available |
Pressure (psi gas) |
Temp | |
|---|---|---|---|---|---|---|
| Dead-end, SD |
1/16" | 0.75 mm | 4 – 16 | 400 | 200°C | Select |
| 1/8" | 1.0 mm | 4 – 8 | 400 | 200°C | Select | |
| 10 – 16 | 200 | 200°C | Select | |||
| 1/4" | 4.0 mm | 4 – 10 | 100 | 75°C | Select | |
| Common outlet, SC |
1/16" | 1.0 mm | 4 – 16 | 200 | 200°C | Select |
| 1/8" | 1.0 mm | 4 – 16 | 200 | 200°C | Select | |
| 1/4" | 4.0 mm | 4 – 8 | 100 | 75°C | Select | |
| Flow- through, SF |
1/16" | 1.0 mm | 4 – 16 | 200 | 200°C | Select |
| 1/8" | 1.0 mm | 4 – 16 | 200 | 200°C | Select | |
| 1/4" | 4.0 mm | 4 – 8 | 100 | 75°C | Select | |
| Trapping, ST |
1/16" | 0.75mm | 4 – 16 | 200 | 200°C | Select |
| 1/8" | 1.0 mm | 4 – 16 | 200 | 200°C | Select | |
| Trapping/ flow- through, STF | 1/16" | 0.75mm | 4 – 16 | 200 | 200°C | Select |
| 1/8" | 1.0 mm | 4 – 16 | 200 | 200°C | Select |
