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An apparatus and method for a diaphragm valve includes a valve body having a chamber in fluid communication with a first channel and a second channel. A diaphragm is disposed in the chamber, and a tapered seat member is at least partially disposed in the first channel. A sleeve is compressively disp

An apparatus and method for a diaphragm valve includes a valve body having a chamber in fluid communication with a first channel and a second channel. A diaphragm is disposed in the chamber, and a tapered seat member is at least partially disposed in the first channel. A sleeve is compressively disposed in the seat member between the seat member and the first channel to maintain a fluid tight seal between the seat member and the first channel. A valve member is movable to controllably urge the diaphragm into and out of engagement with the seat member to control flow of fluid between the first the first and second channel.

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The invention claimed is: 1. A diaphragm valve comprising: a valve body including a chamber in fluid communication with a first channel and a second channel; a bore formed in the first channel, the bore comprising a ridge; a diaphragm disposed in the chamber; a seat member at least partially dispos

The invention claimed is: 1. A diaphragm valve comprising: a valve body including a chamber in fluid communication with a first channel and a second channel; a bore formed in the first channel, the bore comprising a ridge; a diaphragm disposed in the chamber; a seat member at least partially disposed in the first channel, the seat member having an outer tapered portion, the outer tapered portion being disposable inside the valve body, the outer tapered portion of the seat member being plastically deformed by the ridge when the seat member is assembled in the bore; a sleeve compressively disposed in the seat member between the seat member and the first channel to maintain a fluid tight seal between the seat member and the first channel; and a valve member movable to controllably urge the diaphragm into and out of engagement with the seat member to control flow of fluid between the first and second channel. 2. The valve of claim 1 wherein the first channel includes at least one counterbore for receiving the seat member. 3. The valve of claim 2 wherein the at least one counterbore is concentric. 4. The valve of claim 3 wherein the at least one counterbore having at least two differently sized bore portions, with junctions between adjacent bore portions defining at least two ridges. 5. The valve of claim 1 wherein the seat member is a polymeric. 6. The valve of claim 1 wherein the seat member is plastically deformed and compressed between the first channel and the sleeve during installation of the seat member into the first channel. 7. The valve of claim 1 wherein the sleeve includes a flared end. 8. The valve of claim 1 wherein an end of the sleeve abuts a base formed in the first channel. 9. The valve of claim 7 wherein the flared end abuts a base formed in the first channel. 10. The valve of claim 1 wherein the sleeve is composed of a material that is different from the seat member. 11. The valve of claim 10 wherein a coefficient of expansion/contraction of the sleeve is less than a coefficient of expansion/contraction of the seat member. 12. A method for constructing a diaphragm valve, the method comprising: providing a valve body including a chamber in fluid communication with a first channel and a second channel; a bore formed in the first channel, the bore comprising a ridge; inserting a valve member in the valve body; inserting a diaphragm in the chamber between the valve member and the first channel and the second channel; inserting a sleeve inside a seat member having an outer tapered portion; inserting the seat member at least partially in the first channel, the seat member being compressively disposed between the sleeve and the first channel to provide a fluid tight seal between the seat member and the first channel, the outer tapered portion of the seat member being plastically deformed by the ridge when the seat member is assembled in the bore; wherein the valve member being movable to controllably urge the diaphragm into and out of engagement with the seat member to control flow of fluid between the first and second channel; and wherein the outer tapered portion is disposable inside the valve body. 13. The method of claim 12 wherein the step of inserting a sleeve inside the seat member occurs prior to the step of inserting the seat member at least partially in the first channel. 14. The method of claim 12 further includes the step of removing the sleeve and seat member without damaging the first channel. 15. The method of claim 12 wherein the step of inserting the seat member at least partially in the first channel plastically deforms and compresses the seat member between the first channel and the sleeve. 16. The method of claim 12 wherein the sleeve includes a flared end. 17. The method of claim 12 wherein an end of the sleeve abuts a base formed in the first channel. 18. The method of claim 16 wherein the flared end abuts a base formed in the first channel. 19. The method of claim 12 wherein the sleeve is composed of a material that is different from the seat member. 20. The method of claim 19 wherein a coefficient of expansion/contraction of the sleeve is less than a coefficient of expansion/contraction of the seat member.