Yoshitake GPK-2001, Installation & Operation Manual

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■ EPDT-098a ■
-4-
Fig.1
3. Operation
The pressure reducing valve reduces pressure by the throttling the valve. The valve is
composed of the main valve, main valve seat, a pressure adjusting air chamber, and the
main diaphragm, pilot diaphragm, and pilot valve for pressure sensing and activation.
No. Parts name
1 Body
6 Main Valve
7 Main Valve Seat
12 Main Diaphragm
13 Main Valve Spring
15 Screen
17 Pilot Valve
18 Pilot Valve Seat
23 Pilot Diaphragm
23-2 Air pressure sensing port
33 Tee
34,35,36 Pipe A,B,C
12-1 Main diaphragm chamber
23-1 Pilot diaphragm chamber
56-1
Reduced pressure sensing
port
(1) When the pressure reducing valve is mounted correctly, the main valve [6] and pilot valve
[17] should be closed by main valve spring [13] and pilot valve spring [19] when air pressure
is no-pressure. Slowly open the gate valve and allow the high-pressure fluid to flow in. Inlet
pressure is applied to the upside of the main valve. High pressure fluid passes through
screen [15] to also apply inlet pressure to the downside of the pilot valve. (Fig. 1)