A gas chromatograph includes a manifold having a plurality of gas conduits formed therein. A valve module includes a support, a first valve mounted to the support and having a plurality of ports, and a column coupled to the support and being in communication with a port in the first valve. The valve...http://www.google.com/patents/US5808179?utm_source=gb-gplus-sharePatent US5808179 - Modular gas chromatograph
