| Patent application number | Description | Published |
|---|
| 20090014078 | DIAPHRAGM-SEALED VALVE HAVING INTERMEDIATE COMMUNICATION PORTS - A diaphragm-sealed valve having communication mechanisms operatively connecting neighbouring pairs of grooves is provided. Each communication mechanism has a communication port opening in an interface of a valve cap, between the neighbouring grooves. The communication mechanism also has a communication conduit extending within the valve cap and connecting the communication port and one of the neighbouring grooves. It also has a recess within a valve body aligned with the communication port and with the other one of the neighbouring grooves, a flexible sealing surface of the diaphragm being seated within the recess and resiliently biased away from the interface of the valve cap. A plunger assembly is also provided, including plungers movable to push flexible sealing surface towards the communication port. | 01-15-2009 |
| 20090132206 | SYSTEM AND METHOD OF ELIMINATING INTERFERENCE FOR IMPURITIES MEASUREMENT IN NOBLE GASES - The invention provides a system and a method of eliminating interference for impurities measurement in noble gases based on emission spectroscopy which provide very stable, sensitive and interference free results. The method mainly relies on the use of a combination of particularly designed means serially connected for cancelling interferences and proper means for correcting linearity issues. The proposed method is particularly advantageous since it offers long-term stability while providing very accurate and reliable results, even at sub-ppb and up to 10,000 ppm levels, whatever the surrounding conditions and the additional impurities that could be present in the gas under analysis. | 05-21-2009 |
| 20090152481 | DIAPHRAGM-SEALED VALVE WITH PROCESS PURGING GROOVE - A diaphragm-sealed valve provided with a valve cap and a valve body, a diaphragm and a plunger assembly. The diaphragm is compressibly positioned between the valve cap and the valve body. The valve body comprises a process purging channel extending along a main recess of the valve body, under a pre-formed deformation of the diaphragm. A process purging inlet passage and a process purging outlet passage, both opening on the process purging channel, allow for a purging gas to flow in the process purging channel. | 06-18-2009 |
| 20090165642 | Chromatographic Systems And Methods For Eliminating Interference From Interfering Agents - The present invention provides a chromatographic method for eliminating interference from interfering agents, corning from the gas sample itself or from the system material used to perform the impurities measurements, on impurities to be quantified in a gas sample. The method advantageously relies on the use of an additional valve and an additional sample loop particularly arranged in a G. C. system, and also on an additional supporting gas inlet operatively connected to the system through the additional sample loop for providing the system with a supporting gas comprising at least a predetermined portion of a predetermined active gas that will react with the unwanted interfering impurities, if any, or with the column material to cancel out unwanted active sites. Thus, the method of the present invention can advantageously be used in gas chromatographic systems to improve sensitivity thereof by acting on column separation material. | 07-02-2009 |
| 20100059699 | TEMPERATURE COMPENSATED VALVE FOR GAS CHROMATOGRAPHY - Plungers and plunger assemblies for a diaphragm-sealed valve are provided. Each plunger is adpted to be received in a passage of the valve body and includes a base member and an upper member having a longitudinal play in this passage with respect to the base member. A resilient middle element is provided between the upper and base member. The base member is connected to a plunger actuating mechanism within the valve body. Optionally, the upper member may be self-aligning within the passage. The plunger can be used to compensate for temperature variations experienced by the valve in use. | 03-11-2010 |
| 20110233440 | DIAPHRAGM-SEALED VALVE HAVING A LOCKING MECHANISM - A valve includes a valve cap, a valve body, a diaphragm, biasing means and a locking mechanism. The valve cap includes a plurality of process conduits and process ports. The valve body faces the valve cap and includes a plurality of plunger passages extending therein. The diaphragm is positioned between the valve cap and the valve body. The valve body includes a plunger assembly, a first support structure and a second support structure. The plunger assembly includes a plurality of plungers, each slidable between a closed position and an open position. In the closed position, the plunger deforms the diaphragm in order to block communication between two of the process ports. In the open position, the plunger is retracted away from the diaphragm. Each plunger is either a normally closed plunger or a normally open plunger. The normally closed plungers are mounted upon first support structure and the normally open plungers are mounted upon the second support structure. The locking mechanism is for engaging the first support structure and thereby physically restraining the normally closed plungers in the open position. A valve body assembly is also described. | 09-29-2011 |
| 20120025120 | SELF-ALIGNED PLUNGER FOR CHROMATOGRAPHIC VALVE - Plungers and plunger assemblies for a diaphragm-sealed valve are provided. Each plunger is adapted to be received in a passage of the valve body and includes a base member and an upper member having a transversal play in this passage with respect to the base member. A resilient middle element is provided between the upper and base member. The base member is connected to a plunger actuating mechanism within the valve body. The upper member may therefore be self-aligning within the passage. | 02-02-2012 |
| 20120181466 | CONICAL ROTARY VALVE FOR CHROMATOGRAPHIC APPLICATIONS - A conical rotary valve for chromatographic applications is provided, including a valve stator, a valve rotor, a drive adaptor and a pair of stoppers each mounted to the stator. The drive adaptor is rotatable and coupled to the valve rotor for transmitting a rotating force thereto. The drive adaptor has a body and a pair of radial arms projecting from the body radially outward from the axis of rotation on opposite sides thereof. Each of the pair of radial arms is movable along a respective arcuate travelling course with respect to the stator. The stoppers are each positioned to obstruct one of the radial arms at an end of the corresponding travelling course. The stoppers are positioned to simultaneously engage the radial arms, thereby balancing the reaction forces created within the valve when the radial arms reach the ends of their travelling courses. | 07-19-2012 |
