Debubbling and priming system for chromotography

• US 5,607,581 A
• Filed: 10/31/1995
• Issued: 03/04/1997
• Est. Priority Date: 10/31/1995
• Status: Expired due to Fees

• Current Assignee: Systec Incorporated
• Original Assignee: Systec Incorporated
• Inventors: Gerner, Yuri, Sims, Carl W.
• Primary Examiner(s): Therkorn, Ernest G.
• Application Number:
  US08/551,104
• Time in Patent Office: 490 Days
• Field of Search: 210/656, 210/659, 210/101, 210/188, 210/198.2, 95/83, 96/101, 73/61.56
• US Class Current: 210/198.2
• CPC Class Codes: G01N 30/36 in high pressure liquid systems

Abstract

A solvent debubbling/priming device for use in high pressure liquid chromatographic applications includes a valve adapted for releasable and sealed attachment to a bubble collecting/solvent reservoir. The valving portion of the device comprises a valve body with bores formed therein for controlled access and communication between the bubble collecting/solvent reservoir and the exterior of the valve, or atmosphere. The solvent debubbling/priming means includes a length of flexible tubing which has a flattened portion at its distal end and with the tubing being in communication with the bubble collecting/solvent reservoir. The flexible tubing along with its flattened portion provides a flow control and check valve which is chemically inert and free of potentially contaminating lubricants for effective utilization.

Claims

1. Solvent debubbling/priming means for use in high pressure liquid chromatographic applications and including valving means adapted for releasable and sealed attachment to a bubble collecting HPLC solvent reservoir, the valving means comprising a valve body with bores formed therein for controlled access and communication between said bubble collecting/solvent reservoir and the exterior of said valve, said debubbling priming means being characterized in that:

(a) said valve body consists essentially of an inner core and an outer sleeve arranged concentrically with said core;

(b) said inner core and outer sleeve combination having a plurality of bores formed therein providing communication between said bubble collecting/solvent reservoir and the exterior of said valve and including a plurality of means disposed in cooperative relationship with said bores for controlling flow of fluids to and from said reservoir;

(c) first of said fluid flow control means including a length of flexible tubing disposed within a first of said plurality of bores and with said tubing being in communication with said reservoir and with the outer diameter of said length of tubing being less than the inner diameter of said first bore, said tubing being further characterized in that;

(1) said tubing consists of polytetrafluoroethylene having a diameter of between about 0.062 inches and 0.125 inches and with a wall thickness of between about 1 mils and 3 mils, and having the distal end thereof formed flat by pressure and/or heat to provide a check valve permitting fluid flow in one direction therethrough to a zone of substantially equal or lower pressures.

2. The solvent debubbling/priming means as defined in claim 1 being particularly characterized in that said core member is inserted into said sleeve member under force-fit for forming a seal in the annular contact zone therebetween.

3. The solvent debubbling/priming means as defined in claim 2 wherein the outer diameter of said core member exceeds the inner diameter of said sleeve member by an amount equal to approximately 4% of the diameter of said core member.

4. The solvent debubbling/priming means as defined in claim 3 being particularly characterized in that said core member is fabricated from a material having a hardness less than that of said sleeve member.

5. The solvent debubbling/priming means as defined in claim 4 being particularly characterized in that said core member is fabricated of virgin polytetrafluoroethylene.

6. The solvent debubbling/priming means as defined in claim 5 being particularly characterized in that said sleeve member is fabricated of polypropylene.

7. The solvent debubbling/priming means as defined in claim 6 wherein the outer diameter of said core member is between about 1 inch and 3 inches, and the outer diameter of said core exceeds the inner diameter of said sleeve member by about 4% of the inner diameter of the sleeve.

8. The solvent debubbling/priming means as defined in claim 1 being particularly characterized in that said valving means includes a cylindrical valve core member being mounted and received within a bore formed in said core member and adapted for axial rotation therewithin.

9. The solvent debubbling/priming means as in claim 8 being particularly characterized in that said cylindrical valve core member is fabricated from polymeric chlorotrifluoroethylene.