Laboratory & Analytical Instrument Gas
Laboratory gas systems are small but demanding. Carrier gases, calibration blends and sample loops need stable flow, clean wetted surfaces and valves that do not add dead volume to a low-flow line.
Valonix metering valves, needle valves, check valves and compact UHP diaphragm valves are used on GC carrier lines, ICP and MS gas feeds, glove box supplies and calibration manifolds.
Low flow control
A metering valve with Cv 0.019 or a needle valve gives fine adjustment at the low flows typical of analytical instruments. Pair it with a two stage regulator so delivery pressure stays constant as the cylinder empties.
- Cv 0.019 metering stems
- Two stage regulators for stable delivery
- Needle valves for coarse trim
Calibration blends and cross-contamination
Calibration gases are expensive and easily contaminated. Check valves prevent a blend from backing into a shared header, while low dead volume diaphragm valves keep purge times short between different standards.
- Check valves on calibration legs
- Low dead volume shut-off valves
- Face seal ends for re-makeable connections
Bench and panel installation
Compression and VCR ends both appear in labs. Use VCR face seals on the UHP side and compression fittings only on utility lines; keeping threaded cavities out of the sample path reduces drift and moisture pickup.
- VCR on high purity legs
- Compression on utility lines only
- Compact panel and bench mounting
Recommended valve families
Metering & Needle Valves
High purity metering and needle valves for precise specialty gas flow control
High Purity Check Valves
High purity check valves and non-return valves for specialty gas systems
Specialty Gas Regulators
High purity and high pressure specialty gas regulators, single and two stage, 600-6000 PSI inlet
Frequently Asked Questions
Which valve gives the finest flow control for a GC carrier line?
A high purity metering valve with a fine stem, Cv around 0.019.
Do I need a check valve on a calibration line?
Yes, to prevent reverse migration of a calibration blend into shared headers.