Membranventil mit Leckprüfung

摘要

A valve assembly comprises a valve body and at least one valve seat is disposed within the valve body. A groove is disposed therein concentrically around the valve seat. A poppet assembly is disposed within the valve body and comprises an imperforate valve stem and a valve plug at an end of the valve stem. For three-way flow, the valve body includes two valve seats, and a valve plug at each valve stem end. A cap is attached to an end of the valve body top and a first flexible imperforate diaphragm is disposed within the cap. A second flexible imperforate diaphragm is disposed within the valve body bctwccn thc poppet assembly and the first diaphragm, and forms a leak-tight seal with the valve body. A base is attached to an opposite end of the valve body. A third flexible imperforate diaphragm is disposed in the valve body between the poppet assembly and the base, and forms a leak-tight seal with the valve body. A spring means is disposed between the base and the third diaphragm for imposing a biasing force onto the poppet assembly. A containment body is used to encapsulate the spring means and isolate it from any liquid that leaks past the third diaphragm.