Yoshitake GPK-2001 Bedienungsanleitung
■EPDT-098a■
Model GPK-2001, GPK-2003
PRESSURE REDUCING VALVE
Installation & Operation Manual
Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use
of the product, please read this manual before use. This manual shall be kept with care for
future references.
―――――――The following safety symbols are used in this manual. ――――――――
Warning
Caution
Contents
1. Specifications ····························································1~2
2. Dimensions and Weights ·············································2~3
3. Operation ·································································4~6
4. Nominal Size Selection Method
4.1 Specifications selection chart ····································· 7
4.2 Safety valve setting pressure chart ······························ 7
4.3 Characteristics chart················································· 8
4.4 Nominal size selection chart······································· 9
4.5 Nominal size selection calculation formula····················10
5. Installation
5.1 Precautions for installation ········································11
5.2 Installing accessories···············································11
5.3 Piping before and after the pressure reducing valve········12
5.4 Example of piping ···················································13
6. Operating Procedure
7.1 Precautions for operation··········································14
7.2 Adjustment procedures ············································14
7. Maintenance Procedure
8.1 Troubleshooting··················································· 15~16
8.2 Precautions for maintenance and inspection ·················16
8.3 Disassembly······················································· 16~17
8.4 Precautions during reassembly ··································17
8.5 Exploded drawing ················································ 18~19
Warranty Information
This symbol indicates a potentially hazardous situation that, if not
avoided, could result in death or serious injury.
This symbol indicates a hazardous situation that, if not avoided, may
result in minor or moderate injury. (“Caution” may also be used to
indicate other unsafe practices or risks of property damage.)
■EPDT-098a■
-1-
1. Specifications
[Models]
Model
Nominal pressure
Connection
Nominal size
The ratio of control pressure
to setting pressure
GPK-2001
2.0 MPa
Screwed
15 ~ 50A
1: 1
Flanged
15 ~ 100A
1.0 MPa
GPK-2003
2.0 MPa
Screwed
15 ~ 50A
1: 3.5
Flanged
15 ~ 100A
1.0 MPa
[Specifications]
Model
GPK-2001
GPK-2003
Reduced pressure
sensing method (*1)
External sensing
Connection
JIS Rc screwed, JIS 20K RF flanged, JIS 10K FF flanged
Nominal size
15 ~ 50A (Screwed), 15 ~ 100A (Flanged)
Fluid
Steam
Inlet pressure
0.1 ~ 2.0 MPa (JIS Rc, JIS 20K)
0.1 ~ 1.0 MPa (JIS 10K)
0.25 ~ 2.0 MPa (JIS Rc, JIS 20K)
0.25 ~ 1.0 MPa (JIS 10K)
Reduced pressure
0.05 ~ 0.9 MPa (JIS Rc, JIS 20K)
0.05 ~ 0.85 MPa (JIS 10K)
0.2 ~ 1.4 MPa (JIS Rc, JIS 20K)
0.2 ~ 0.85 MPa (JIS 10K)
85% or less of inlet pressure (gauge pressure)
System air pressure
Refer to Standard “Loading pressure - Set pressure” chart line.
Min. differential
pressure
0.05 MPa
Max. pressure reducing
ratio
20: 1
10: 1
Max. temperature
220 °C
Valve seat leakage
0.01% or less of rated flow
Material
Body
Ductile Cast iron
Main valve
Stainless steel
Main valve seat
Stainless steel
Pilot valve
Stainless steel
Pilot valve seat
Stainless steel
Diaphragm
Stainless steel
(*1) For reduced pressure sensing method, internal sensing method valves will be
available upon request.
Caution
(1) Please collate with attached nameplate and specification of ordered model.
* Please consult factory in case they do not match each other.
■EPDT-098a■
-2-
[Standard “Loading Pressure - Set Pressure” chart Line]
Basically, the set pressure to the loading air
pressure is as shown in the chart above. The
set pressure is slightly different depending on
the working conditions. For the actual use,
adjust loading air pressure suitable for the
necessary set pressure.
2. Dimensions and Weights
[GPK-2001]
•The structure differs for nominal sizes 50A to 100A.
(mm)
Nominal
Size
Screw (JIS Rc)
Flanged (JIS 20K RF)
d
L
H
H1
A
Weight
（kg）
L
H
H1
A
Weight
（kg）
15A
Rc 1/2
150
335
170
200
14.0
146
335
170
200
15.5
20A
Rc 3/4
150
335
170
200
14.0
146
335
170
200
16.0
25A
Rc 1
160
341
175
226
18.5
156
341
175
226
21.0
32A
Rc 1-1/4
180
371
192
226
21.5
176
371
192
226
24.0
40A
Rc 1-1/2
180
371
192
226
21.5
196
371
192
226
24.5
50A
Rc 2
230
435
216
276
33.0
222
435
216
276
36.0
65A
―――
－
－
－
―
―――
282
489
251
352
64.5
80A
―――
－
－
－
―
―――
302
512
264
352
71.5
100A
―――
－
－
－
―
―――
342
595
321
401
111.0
* Different Length (L) and Weight values apply for JIS 10K FF.
* Other standard connections are available upon request.
(Screwed)
(Flanged)
■EPDT-098a■
-3-
[GPK-2003]
•The structure differs for nominal sizes 50A to 100A.
(mm)
Nominal
Size
Screw (JIS Rc)
Flanged (JIS 20K RF)
d
L
H
H1
A
Weight
（kg）
L
H
H1
A
Weight
（kg）
15A
Rc 1/2
150
353
170
200
17.5
146
353
170
200
19.0
20A
Rc 3/4
150
353
170
200
17.5
146
353
170
200
19.5
25A
Rc 1
160
359
175
226
22.0
156
359
175
226
24.5
32A
Rc 1-1/4
180
389
192
226
25.0
176
389
192
226
27.5
40A
Rc 1-1/2
180
389
192
226
25.0
196
389
192
226
28.0
50A
Rc 2
230
453
216
276
36.5
222
453
216
276
39.5
65A
―――
－
－
－
―
―――
282
507
251
352
68.0
80A
―――
－
－
－
―
―――
302
530
264
352
75.0
100A
―――
－
－
－
―
―――
342
613
321
401
114.5
* Different Length (L) and Weight values apply for JIS 10K FF.
* Other standard connections are available upon request.
(Screwed)
(Flanged)
■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)
■EPDT-098a■
-5-
Fig.2
Fig.3
(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)
■EPDT-098a■
-6-
Fig.4
(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)
■EPDT-098a■
-7-
4. Nominal Size Selection Method
4.1 Pressure reducing valve specification selection chart
Refer to the above selection chart to select the most appropriate pressure reducing valve.
Find the point of intersection of inlet pressure(P1) and reduced pressure(P2). When the point
of intersection is within range(A), reduce pressure in two stages. When within range (C),
maximum performance cannot be obtained. When reducing pressure in two stages,
maximize the distance between the valves (at least 3 m).
4.2 Safety valve setting pressure chart
This chart is for setting the safety valve (for alarms) used for steam pressure reducing
valves.
Determine the reduced pressure of pressure reducing valve. Find the intersection point (A)
with the chart curve. Next, find point (B) by proceeds horizontally from point (A) to the left
until the ‘Setting pressure of safety valve’ axis. The setting pressure of the safety valve
should be higher than the pressure of the point (B).
■EPDT-098a■
-8-
4.3 Characteristic chart
(1) Flow rate characteristics chart
● Shut-off pressure rise: 0.02 MPa or less
● Offset: 10% or less of set pressure at outlet side (Minimum value: 0.0MPa)
Using the nominal size selection chart, select the nominal size of 80 ~ 90% of the flow rate,
considering pressure loss and heat loss of the gate valve and the strainer before and after
the pressure reducing valve. To fully utilize the flow characteristics of the valve, do not select
a small pipe size, considering the effects due to pipe resistance.
(2) Pressure characteristics chart
Reduced pressure is set to 0.14 MPa when inlet pressure is 1.75 MPa. The chart indicates
a variation in reduced pressure when the inlet pressure is changed within the range of 0.2
to 2.0 MPa.
■EPDT-098a■
-9-
4.4 Nominal size selection chart (External sensing)
* Please contact us on internal sensing method.
For example, take a pressure reducing valve whose inlet pressure (P1) is 0.6 MPa, reduced
pressure (P2) 0.4 MPa, flow rate 600 kg/h. When determining the nominal size, find the
point of intersection (A) of inlet pressure 0.6 MPa and reduced pressure 0.4 MPa. Vertically
proceed from point (A) to come across the flow rate 600 kg/h, and regard this point as (B).
Point (B) is between nominal sizes 20A and 25A. Select the larger nominal size (in this
example, nominal size 25A)
Dieses Handbuch passt für folgende Modelle
1
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