Specifications

SD74
20
• Plungers – The plungers differ in shape, as shown in this figure.
• Diaphragm Rings – The Model 74S diaphragm ring has a nozzle. The Model 74 ring does not.
• Diaphragm Assemblies – The Model 74S has a diaphragm spacer with a small hole drilled in it, as
shown by the cutaway view in this figure. The Model 74 spacer does not have this hole.
• Housings – The housing for the Model 74 has a positioner nozzle. The Model 74S housing does not.
FIGURE 5-1 Parts Comparison Models 74 and 74S