One-way valve for fluid sampler device

A fluid sampler device with one-way valve comprising;

• first means for sampling fluid, second means for controlling the frequency of sampling in a repetitive manner, and third means for effecting a one-way flow of the fluid being sampled, said first means including a sample chamber, and the third means including a valve chamber for the fluid sample, an inlet thereto, and a sample outlet therefrom, and the third means further including a flexible valve member which normally takes on a concave shape when the valve is passing fluid, and assumes a flat plane shape when the fluid flow is stopped and the valve is closed, and fourth means associated with the flexible valve to effect the cleaning action of a valve seat within the valve chamber, the fourth means consisting of the edge of the flexible valve member which scraps the inner valve seat portion of the valve chamber when the flexible valve member goes from the convex shape to the flat plane shape with each operation of the over-all device, the valve sample chamber having associated therewith a pulse relay means for effecting the repetitive sample operation, the pulse relay means including a pneumatic operator diaphragm and check valve structure connected to a pneumatic source in order to effect said repetitive function of the second means, the pulse relay means further including a spring bias for the diaphragm and an adjustable bleed needle valve to permit a slow flow of air out of the pulse relay means in order to adjust the repetitive rate of the structure, and the device including two substantially parallel elongated tubes connected at the bottom thereof to the valve sample chamber, one of said tubes being connected to the pulse relay means at the top thereof, and the other elongated tube being connected to a sample outlet at the top thereof.