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Piston diaphragm with integral seal

Imported: 24 Feb '17 | Published: 06 Jan '04

David Kerg, Michael R. Whaley

USPTO - Utility Patents

Abstract

A radial diaphragm valve includes a diaphragm having an elongated stem that is threadably or otherwise installed on an actuator piston. The elongated stem is slideably received in a bore formed in the actuator housing, and includes a circumferential recess that receives a seal. The seal provides a backup seal function separating the process fluid from the interior region of the actuator.

Description

These and other aspects and advantages of the present invention will be apparent to those skilled in the art from the following description of the preferred embodiments in view of the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING

The drawing is a radial diaphragm valve illustrated in longitudinal cross-section in accordance with the invention.

Claims

1. In a radial diaphragm valve of the type having a valve body having a valve cavity therein, a diaphragm having a perimeter that seals the valve cavity, a first fluid passage in the valve body that opens to the valve cavity and a second fluid passage in the valve body that opens to the valve cavity; the diaphragm having a central diaphragm stem that opens and closes the valve such that the diaphragm stem is movable between a valve open and valve closed position along an axis; and an actuator for moving the diaphragm stem to open and close the valve, the improvement comprising:

2. The valve of claim 1 wherein said seal comprises an o-ring.

3. The valve of claim 1 comprising an actuator stem coupled with said diaphragm stem.

4. The valve of claim 1 wherein said seal prevents fluid from the valve cavity from passing into the actuator when the diaphragm seal is compromised.

5. The valve of claim 1 comprising an actuator housing having a bore therein that slideably receives a portion of said diaphragm stem, said seal being positioned within said bore for the entire stroke of the diaphragm stem.

6. The valve of claim 5 wherein said seal journals and guides said diaphragm stem in said bore, thereby facilitating alignment of diaphragm.

7. The valve of claim 1 wherein the diaphragm comprises a lubricious polymeric material.

8. The valve of claim 6 wherein the diaphragm comprises PTFE.

9. The valve of claim 1 wherein the actuator comprises an air actuator.

10. In a radial diaphragm valve of the type having a valve body having a valve cavity therein, a diaphragm having a perimeter that seals the valve cavity; a first fluid passage in the valve body that opens to the valve cavity and a second fluid passage in the valve body that opens to the valve cavity; the diaphragm having a central diaphragm stem that opens and closes the valve such that the diaphragm stem is movable between a valve open and valve closed position along an axis; and an actuator for moving the diaphragm stem to open and close the valve, the improvement comprising:

11. The valve of claim 10, wherein said backup seal is an o-ring received in a groove on the diaphragm stem.

12. In a radial diaphragm valve of the type having a valve body having a valve cavity therein, a diaphragm having a perimeter that seals the valve cavity; a first fluid passage in the valve body that opens to the valve cavity and a second fluid passage in the valve body that opens to the valve cavity; the diaphragm having a central diaphragm stem that opens and closes the valve such that the diaphragm stem is movable between a valve open and valve closed position along an axis; and an actuator for moving the diaphragm stem to open and close the valve, the improvement comprising:

13. In a radial diaphragm valve of the type having a valve body having a valve cavity therein, a diaphragm having a perimeter that seals the valve cavity; a first fluid passage in the valve body that opens to the valve cavity and a second fluid passage in the valve body that opens to the valve cavity; the diaphragm having a central diaphragm stem that opens and closes the valve such that the diaphragm stem is movable between a valve open and valve closed position along an axis; and an actuator for moving the diaphragm stem to open and close the valve, the improvement comprising:

14. In a radial diaphragm valve of the type having a valve body having a valve cavity therein, a diaphragm having a perimeter that seals the valve cavity; a first fluid passage in the valve body that opens to the valve cavity and a second fluid passage in the valve body that opens to the valve cavity; the diaphragm having a central diaphragm stem that opens and closes the valve such that the diaphragm stem is movable between a valve open and valve closed position along an axis; and an actuator for moving the diaphragm stem to open and close the valve, the improvement comprising:

15. The valve of claim 14, where said inert matter is PTFE.