SAMSON SED completed extensive R&D and testing activities so that new EPDM diaphragm types can be offered. One is the new Code 20 EPDM diaphragm, which has much better features.
Normally, the diaphragms' fabric insert is vulcanized between two elastomer layers with identical thickness. This gives the diaphragm extra strength. Experience gathered in the field and feedback from our customers led us to develop and test the changed design of the Code 20 diaphragm based on the new, higher-grade EPDM elastomer compound.
The new manufacturing procedure developed for the Code 20 diaphragm makes it possible to vulcanize the fabric reinforcement directly onto the back of the diaphragm. This has several benefits, such as a longer service life if the diaphragm is cleaned by SIP (Sterilization-in-Place cycles using steam). The fabric is located as far away from the medium contact surface as possible. The level of wear could be reduced thanks to minimized friction between the back of the diaphragm and the compressor. Loads are better distributed because the elastomer layer has been maximized. Processes become safer as only a single fabric layer with an exactly defined geometry on the back of the diaphragm is used. Quality control has become easier as well because the fabric is on the back of the diaphragm and a visual inspection reveals possible weak spots in the bond between fabric and elastomer. In the diaphragms commonly available on the market, manufacturers attempt to detect weak spots by destructive testing on random samples.
The new Code 20 EPDM diaphragm has the same geometry as the other diaphragm versions available from SAMSON SED. As a result, it can easily be used to replace other diaphragms in all SED diaphragm valves. All conformity and certification requirements are fulfilled.