Sealing diaphragm and methods of manufacturing said diaphragm

Abstract

Described is a method for manufacturing a diaphragm assembly through the use of injection molding. The method can avoid the use of PTFE as a chemically resistant coating. Further, the method can increase overall adherence of a polymer diaphragm to an insert through the use of an interference surface on at least the surface of a head of the insert.

1 - 33 . (canceled) 
     
     
         34 . A two part diaphragm assembly comprising:
 an insert having a head and a body, wherein the head is located at one end of the body;   at least one interference surface formed on the insert; and   an injection-molded polymer diaphragm configured to at least partially surround the head of the insert and interfere with the at least one interference surface, the polymer forming a first ring located on a surface of the diaphragm facing way from the body of the insert and a second ring located on a surface of the diaphragm opposite the first ring.   
     
     
         35 . The two part diaphragm assembly of  claim 34 , wherein the first ring is directly opposite the second ring. 
     
     
         36 . The two part diaphragm assembly of  claim 34 , wherein the first ring and the second ring have a radius of 0.005, 0.01, 0.02, 0.03, 0.04, or 0.05 inches. 
     
     
         37 . The two part diaphragm assembly of  claim 34 , wherein the first ring and the second ring are the same size. 
     
     
         38 . The two part diaphragm assembly of  claim 34 , wherein the insert includes a threaded portion at least 0.2 inches in length. 
     
     
         39 . The two part diaphragm assembly of  claim 34 , wherein the diameter of the polymer diaphragm assembly is about 1.5, 1.8, 2.0, 2.1, 2.140, 2.3, or 2.5 inches.