Sample extraction system

Claim 1

A sample extraction system, comprising: a. a block fitting, including: i. an inlet; ii. an outlet; iii. an interior passageway, providing communication between said inlet and said outlet thereby allowing fluid to flow through said block fitting; iv. a pressure reducing means, for causing a pressure drop within said interior passageway, positioned within said interior passageway; v. a sample port; vi. a sample passageway, connecting said interior passageway and said sample port between said inlet and said pressure reducing means; vii. a re-entry port; and viii. a re-entry passageway, connecting said re-entry port and said pressure reducing means; b. a loop entry line, connected at a first point a main flow line, and on the other end to said inlet of said block fitting; c. a loop exit line, connected on one end to said main flow line at a second point where pressure is less than that at said first point where said loop entry line is connected to said main flow line such that fluid will flow from said main flow line into said loop entry line, and on the other end to said outlet of said block fitting; d. a sample container, having an inlet and an outlet; e. a sample inlet line, connected on one end to said sample port, and on the other end to said inlet of said sample container; f. at least one sample inlet valve, positioned in said sample inlet line; g. a sample exit line, connected on one end to said outlet of said sample container, and on the other end to said re-entry port; and h. at least one sample exit valve, positioned in said sample exit line, whereby fluid flow is induced through the loop entry line, block fitting, loop exit line, sample inlet line, container, and sample exit line due to the pressure differential between the two points only.