G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 1/20 (2006.01) G01N 1/00 (2006.01) G01N 1/16 (2006.01) G01N 35/00 (2006.01)
Patent
CA 2103645
ABSTRACT OF THE DISCLOSURE A stream selector for a process analyzer. In one aspect the invention provides a valve module for a process analyzer. The module includes a first block valve having a first opening, a second block valve having a second opening, and a bleed valve having a third opening. The first and second block valves are made so that both are closed or both open at the same time. The block valves and the bleed valve are made so that, in a first mode, the block valves are closed and the bleed valve is open; in a second mode, the block valves are open and the bleed valve is closed; and in a third mode, all of the valves are open, thereby ensuring that the module is completely purged. In a second aspect the invention provides a stream-selection valve manifold. The manifold is made by joining two or more valve modules side by side to form a common outlet passageway and a common vent passageway, thereby ensuring that the manifold is completely purged. In a third aspect the invention provides a single block-and-bleed valve module. The module includes a block valve, a sample-fluid compartment, a vent compartment, an internal pneumatic actuator, an actuator compartment, a sample-inlet first passageway, a sample-outlet second passageway, a third passageway for introducing a compressed gas into the actuator compartment, a fluid-disposal fourth passageway, a spring for closing the block valve, a compressed gas for opening the valve, and a body for containing the modular components. The disposal passageway provides fluid communication between the vent compartment and an external area suitable for the safe disposal of sample fluids and compressed gas contained in the valve module. The pressure within the vent compartment and the disposal passageway is normally kept equal to or lower than that of the sample-inlet passageway, sample-outlet passageway, and actuator compartment, in order to prevent fugitive emission of the sample fluid or the compressed gas from the module into the external environment. The flat-face sealing structure of each valve is very tolerant of scratching and/or irregularities in the sealing structure and of abrasive particulates which may be present in the sample fluid, and even to minor structural damage to the sealing structure.
Sim & Mcburney
Whitey Co.
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