Sealing diaphragm

EPDMchemical-resistant

In practice, this means that we are able to cover a comprehensive spectrum of applications with just a few diaphragm types. A change between the diaphragm types in the same diaphragm size can be carried out easily without having to replace other components. The design of the diaphragms is specially adapted to the unique SISTO sealing system. This means that the diaphragms are chambered into the valve bodies and are fully supported from the rear by a spiral spring made of stainless steel. The SISTOAseptiXX diaphragms come from our own production and are manufactured using high-quality materials. The diaphragms as a very important component of the diaphragm valves are subject to constantly being further developed by SISTO. With the SISTOAseptiXX 2-piece TFM/EPDM diaphragms, diaphragms with a thicker TFM layer are available. In order to fully utilise the actuation force without affecting the plastic diaphragm’s long service life, the TFM diaphragm is backed by a second diaphragm made of EPDM. A metal pin embedded in the TFM diaphragm is used to lift the diaphragm and thus to open the valve. In order to prevent damage to the diaphragm during valve closure, the metal pin is fitted to the bonnet assembly by means of a floating nut. The materials comply with the specifications of FDA, EU1935 and USP. These diaphragms are perfectly suited for applications involving high chemical and thermal stress.