Sample injection or extraction head for gaseous or liquid fluids
US4854181A · kind A · utility
Inventor
Key dates
| Filing date | Feb 22, 1988 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Feb 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sample injection or extraction head for gaseous or liquid fluids, especially for use in gas chromatography. An inner bore of the head is in alignment with a passage of an introduction opening for receiving a syringe needle. The introduction opening is connected with the inner bore via a seal so that a syringe needle which has been inserted through the introduction opening into the inner bore is sealed against the exterior via the seal. An inlet valve is provided having a valve body which is sealingly spring biased against the inner bore and is displaceable by the introduction of a syringe needle for opening the valve against the spring bias, such displacement taking place at an angle between the axis of the inner bore and the axis of the valve within the range of more than 90.degree. up to less than 180.degree.. A cylindrical guide for the valve body ends in a recess of the head. The recess extends across the inner bore and provides an annular sealing surface. A substantially cylindrical protrusion member supports a sealing ring which, in the closed position of the valve, is in sealing engagement with the sealing surface. Thus, the protrusion member extends into the recess so tha…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.