US Patent 7273072 Valve body for a valve assembly

A valve body for a valve assembly includes a main passageway in which a primary valve is received which has a weir constructed to define a valve seat and to interact with a valve element in the form of a diaphragm. Integrated in the valve body is a secondary valve having a weir which defines a valve seat and interacts with a second valve element in the form of a diaphragm. The secondary valve is constructed to allow establishment of a fluid communication upstream of the valve seat of the primary valve between the main passageway and a branch line, via which a medium sample can be extracted and/or steam and/or condensate can be, optionally, released.