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(4) Reduced pressure is led to the pilot diaphragm chamber [56-1] via the sensing pipe and
reduced pressure sensing port [23-1]. The pilot diaphragm receives the reduced pressure to
be balanced with the air pressure. The pilot valve travel is controlled by the air pressure and
pressure applied to the pilot diaphragm due to variations in reduced pressure. This changes
the flow rate of fluid to the main diaphragm chamber, which controls the main valve travel to
obtain appropriate reduced pressure. (Fig. 4)
Fig.4
■EPDT-098a■
-6-
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