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1. WO2020160634 - VANNE D'ÉCHANTILLONNAGE À MEMBRANE D'INJECTION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS:

1. A sample injection diaphragm valve for channeling fluid therein, comprising:

a valve head comprising a plurality of process conduits extending therethrough, each of the process conduits ending in a process port;

a valve body facing the valve head, the valve body comprising a body interface provided with a recess, the valve body also comprising plunger passages extending therein, said plunger passages opening on the recess;

a diaphragm positioned between the valve head and the valve body and having a process groove seated in the recess of the valve body, for circulating fluid therein;

a normally closed plunger assembly and a normally open plunger assembly, provided between within the valve body, each assembly comprising plungers slidably fitted in the plunger passages of the valve body, each plunger being movable between a closed position wherein the plunger deforms the diaphragm and blocks fluid circulation between two of the process ports and an open position wherein the plunger is retracted away from the diaphragm, allowing fluid to circulate, the plunger having a head with a top face, the top face being provided with a linear lip protruding thereon and extending across said top face, at least a portion of said linear lip pressing against the diaphragm when the plunger is in the closed position.

2. The sample injection diaphragm valve according to claim 1 , wherein the plunger comprises a plunger body and a plunger head, the plunger head extending from said plunger body, the plunger body and the plunger head being both substantially cylindrical in shape, the plunger head having a narrower diameter than a diameter of the plunger body.

3. The sample injection diaphragm valve according to claims 1 or 2, wherein each plunger comprises a first circular shoulder between the main body and the head of the plunger, and second and third shoulders between the top face of the head of the plunger and opposites sidewalls of the protruding linear lip.

4. The sample injection diaphragm valve according to anyone of claims 1 to 3, wherein the top face of each plunger comprises two semicircular areas and one rectangular area on said protruding linear lip, said rectangular area being raised and spaced away from the two semicircular areas.

5. The sample injection diaphragm valve according to anyone of claims 1 to 4, wherein the process groove is an annular process groove having a groove width, and wherein the protruding linear lip extending on top of the plunger has a length corresponding to the width of the process groove.

6. The sample injection diaphragm valve according to anyone of claims 1 to 5, wherein in the closed position, the protruding linear lip of each plunger presses a contact surface on the bottom surface of the diaphragm, deforming the diaphragm such that areas of the diaphragm on each side of the contact surface extend on both sides of the protruding lip, in line with recessed areas of the top face of the plunger head.

7. The sample injection diaphragm valve according to anyone of claims 1 to 6, wherein the closed position, contact surfaces formed between the plungers and the bottom surface of the diaphragm extend linearly and radially relative to a central axis of the valve.

8. The sample injection diaphragm valve according to anyone of claims 1 to 7, wherein both the normally closed plunger assembly and the normally open plunger assembly comprise disk plates, the plungers of a given one of the assemblies extending from the corresponding disk plate.

9. The sample injection diaphragm valve according to anyone of claims 1 to 9, wherein the disk plates are stacked one on the other in the valve body, one of said normally closed and normally open plunger assemblies having its disk plate provided with plunger holes extending therethrough, for letting plungers of the other assembly pass therethrough.

10. The sample injection diaphragm valve according to anyone of claims 1 to 9, wherein for each assembly, the disk plate and corresponding plungers are integrally formed as a single component.

1 1. The sample injection diaphragm valve according to anyone of claims 1 to 10, wherein the linear lip of each plunger, when in the closed position, forms a single gate between two adjacent process ports, said gate or sidewall radially extending relative to a central axis of the valve.

12. The sample injection diaphragm valve according to anyone of claims 1 to 11 , wherein the linear lip of each plunger, when in the closed position, creates a contact surface with a bottom surface of the diaphragm, said contact surface being narrower than an area corresponding to the head of the plunger.

13. The sample injection diaphragm valve according to anyone of claims 1 to 12, wherein the linear lip has a flat diaphragm-contacting surface.

14. The sample injection diaphragm valve according to anyone of claims 1 to 12, wherein the linear lip has one of concave, convex or double-wall shape.

15. The sample injection diaphragm valve according to anyone of claims 1 to 14, wherein the valve is pneumatically actuated, the valve comprising a valve bottom cap, providing a closed chamber for the actuating gas.

16. A plunger assembly for a sample injection diaphragm valve, the valve having a valve head and a valve body, the valve body being provided with a plurality of passages extending therein and opening on a recess of the valve body, the valve including a diaphragm positioned between the valve head and the valve body and having a process groove seated in the recess of the valve body, for circulating fluid therein, said plunger assembly comprising:

plungers for slidably fitting in the plunger passages of the valve body, wherein in use, each plunger is movable between a closed position wherein the plunger deforms the diaphragm and blocks fluid circulation between two of the process ports and an open position wherein the plunger is retracted away from the diaphragm, allowing fluid to circulate, the plunger having a head with a top face, the top face being provided with a linear lip protruding thereon and extending across said top face, said linear lip pressing against the diaphragm when the plunger is in the closed position.

17. The plunger assembly according to claim 16, wherein the plunger assembly is one of a normally closed plunger assembly and a normally open plunger assembly, said assembly comprising a disk plate, the plungers extending from said disk plate.

18. The plunger assembly according to claim 16 or 17, wherein for each assembly, the disk plate and corresponding plungers are integrally formed as a single component.

19. The plunger assembly according to anyone of claims 16 to 18, wherein each plunger comprises a main body, the head of the plunger extending from said main body, the main body and the head being both substantially cylindrical in shape, the head having a narrower diameter than a diameter of a main body of the plunger.

20. The plunger assembly according to anyone of claims 16 to 19, comprising a first circular shoulder between the main body and the head of the plunger, and second and third shoulders between opposites sides the head portion and the protruding linear lip.

21. The plunger assembly according to anyone of claims 16 to 20, wherein the top face of the plunger comprises two semicircular areas and one rectangular area on said protruding linear lip, said rectangular area being raised and spaced away from the two semi-circular area.

22. A plunger assembly for a sample injection diaphragm valve, the valve having a valve head and a valve body, the valve body being provided with a plurality of passages extending therein and opening on a recess of the valve body, the valve including a diaphragm positioned between the valve head and the valve body and having a process groove seated in the recess of the valve body, for circulating fluid therein, said plunger assembly comprising:

plungers for slidably fitting in the plunger passages of the valve body, wherein in use, each plunger is movable between a closed position wherein the plunger deforms the diaphragm and blocks fluid circulation between two of the process ports and an open position wherein the plunger is retracted away from the diaphragm, allowing fluid to circulate, the plunger having a head with a top face, the top face being provided with a lip protruding thereon and extending across said top face, said lip pressing against the diaphragm when the plunger is in the closed position, said lip having a diaphragm-contacting surface which is smaller than a peripheral area of the plunger head.

23. A method of operating a sample injection diaphragm valve, the method comprising:

a) providing the valve with:

a valve head comprising a plurality of process conduits extending therethrough, each of the process conduits ending in a process port; a valve body facing the valve head, the valve body comprising a body interface provided with a recess, the valve body also comprising plunger passages extending therein, said plunger passages opening on the recess;

a diaphragm positioned between the valve head and the valve body and having a process groove seated in the recess of the valve body, for circulating fluid therein, the process groove having a groove width;

a normally closed plunger assembly and a normally open plunger assembly, each assembly comprising plungers slidably fitted in the plunger passages of the valve body, each plunger being movable between a closed position to block fluid circulation between two of the ports, and an open position to allow fluid to circulate in the process groove between two of the ports;

b) actuating the valve by moving the normally closed plunger assembly toward an open configuration, and simultaneously moving the normally open plunger assembly toward a closed configuration; the plungers of the normally open plunger assembly compressing the diaphragm against the cap valve along respective contact areas which are substantially linear, and which extend across the groove width.

24. The method according to claim 23, comprising a step of circulating fluid from at least one process conduit in the process groove of the diaphragm toward at least another one of the process conduits, and a step of deactivating the valve, the normally closed plunger assembly returning in the closed configuration, and the normally open plunger assembly returning in the open configuration, the plungers of the normally closed plunger compressing the diaphragm against the cap valve along respective contact areas which are substantially linear, and which extend across the groove width.

25. The method according claims 23 or 24, wherein in the closed position, the plungers deforms the diaphragm such that areas of the diaphragm on each side of the contact surface extend downwardly, facing recessed areas of a top face of heads of the plungers.

26. The method according to anyone of claims 23 to 25, wherein in the closed position, contact areas formed between the plungers and a bottom surface of the diaphragm extend linearly and radially relative to a central axis of the valve.