SIGMA S2Ba - Manual (Page 19)

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Page 19 Pr o Minent ®
Product description S2Ba/S2Ca
Fig. 5
3154-4
2.2.4 Functional description, delivery unit
The heart of the delivery unit is the DEVELOPAN ® metering diaphragm (2). It hermetically seals
the delivery chamber of the liquid end (4) and produces a displacement in the liquid end. The end
disc (5) made of chemically resistant plastic together with safety diaphragm (13) separates the
drive housing from the delivery unit and protects the drive from corrosion in the event of the
diaphragm failing. Delivery is based on the interaction between intake valve (1) and head valve (3)
of the same design together with the diaphragm movement. The valve balls can be supported
with springs for metering viscous media.
The connection dimensions of valves and liquid ends of the same size but with different materials
are identical. These parts can be interchanged as required.
Materials and dimensions are specified in Section 3, Technical data.