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(2) Introducing air pressure into air chamber flexes pilot diaphragm [23] to open the pilot valve.
The fluid passing through pilot valve [17] and pilot valve seat [18] enters the main diaphragm
chamber [12-1] via pipes [34] and [36]. This fluid also flows to the reduced side of the body
[1] through the orifice of tee [33] and pipe [35] that connects to the body. (Fig. 2)
(3) When the flow rate at the pilot valve exceeds the flow rate at the orifice, operating pressure
in the main diaphragm chamber raised and overrides the pressure on the upside of the main
valve and the load of main valve spring [13] to open the main valve. The fluid then begins
to flow from the inlet side. (Fig. 3)
Fig.2
Fig.3
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■EPDT-098a■
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