Expansion valve

Abstract

A thermal expansion valve for a refrigeration system comprises a working element with a diaphragm clamped between a cover plate and a cover ring. The diaphragm is a multiple-diaphragm comprising two or more individual diaphragms. This makes the multiple-diaphragm more flexible than a single diaphragms and increases the lifetime of the diaphragm. The individual diaphragms are separated by an anti-friction layer to protect against tear, the anti-friction layer can be grease or oil placed between the individual diaphragms or it can be a layer of coating on the diaphragms.

1 - 7 . (canceled) 
     
     
         8 . A thermal expansion valve for a refrigeration system comprising a working element comprising a diaphragm chamber, a base ring and a cover plate wherein the diaphragm chamber comprises a multiple-diaphragm placed between the base ring and the cover plate, the multiple-diaphragm comprises two or more individual diaphragms and the individual diaphragms are separated by an antifriction layer. 
     
     
         9 . The thermal expansion valve according to  claim 8  wherein the antifriction layer is grease or oil or another suitable fluid. 
     
     
         10 . The thermal expansion valve according to  claim 8  wherein the antifriction layer is rubber or plastic. 
     
     
         11 . The thermal expansion valve according to  claim 8  wherein the individual diaphragms comprises a coating. 
     
     
         12 . The thermal expansion valve according to  claim 11  wherein the coating is made of carbon, rubber, Teflon or a plastic material. 
     
     
         13 . The thermal expansion valve according to  claim 11  wherein the coating is made of cobber, tin, zinc or another suitable metal or alloy.