Operation - Yoshitake GP-2000 Installation & Operation Manual

4. Operation

The pressure reducing valve reduces pressure by the throttling the valve. The valve is composed of
the main valve and main valve seat for throttling, and adjusting spring, diaphragm, pilot valve, and
piston for pressure sensing and activation.
(1) When the pressure reducing valve is mounted correctly, releasing the compression of adjusting
spring [24] allows main valve spring [13] and pilot valve spring [19] to close main valve [6]
and pilot valve [17]. 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)
No.
1
6
7
12
13
15
17
18
23
24
27
34,35,36
12-1
23-1
56
Fig. 1
-4-
Parts name
Body
Main Valve
Main Valve Seat
Main Diaphragm
Main Valve Spring
Screen
Pilot Valve
Pilot Valve Seat
Pilot Diaphragm
Spring
Adjusting Screw
Pipe A,B,C
Main diaphragm chamber
Pilot diaphragm chamber
Reduced press. sensing port
■EPDT-014f■