Yoshitake GP-2000 Bedienungsanleitung

■EPDT-014f■

Model GP-2000

PRESSURE REDUCING VALVE

Installation & Operation Manual

Please read this bulletin thoroughly before using the pressure reducing valve, so that you may

do so correctly and safely. Please carefully store this bulletin in a handy place.

―――――――――The following safety symbols are used in this manual. ――――――――

Warning

Caution

Contents

1. Features ····································································· 1

2. Specifications······························································· 1

3. Dimensions and Weights················································ 2

4. Operation···································································· 3

5. Nominal Size Selection Method

5.1 Specifications selection chart ······································ 7

5.2 Safety valve setting pressure chart······························· 7

5.3 Characteristics chart ················································· 7

5.4 Nominal size selection chart ······································· 8

5.5 Nominal size selection calculation formula····················· 9

6. Installation

6.1 Example of piping····················································· 9

6.2 Precautions during installation···································· 10

6.3 Installing accessories ··············································· 11

6.4 Sensing pipe connection method ································ 11

7. Operating Procedure

7.1 Precautions during operation ····································· 11

7.2Adjustment procedures············································· 12

8. Maintenance Procedure

8.1 Troubleshooting ······················································ 12

8.2 Precautions during maintenance and inspection ·············13

8.3 Disassembly··························································· 14

8.4 Precautions during reassembly··································· 14

8.5 Exploded drawing···················································· 15，16

After Sale Service

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-014f■

1. Features

GP-2000 pressure reducing valves for steam are pilot-operated valves which can be used with

confidence for small to large flow rate, in a host of applications ranging from building utilities systems,

air-conditioning systems, and factory systems, etc.

2. Specifications

2.1 Models

Model Nominal pressure Connection

Nominal size

Pilot type

GP-2000 2.0 MPa Screwed 15-50A Integral mount

(or Remote mount)

Flanged 15-200A

1.0 MPa

GPP-2000

Pilot valve (common for screwed and flanged valves of all nominal sizes)

GPM-2000

Main valve (Screwed and flanged)

2.2 Specifications

Model GP-2000

Reduced pressure sensing

method (*1) External sensing

Connection JIS Rc Screw Flanged (JIS 20K RF) Flanged (JIS 10K FF)

Nominal size 15～50A 15～200A

Fluid Steam

Inlet pressure 0.1～2.0 MPa 0.1～1.0 MPa

Reduced pressure (*2) 0.02～0.15 MPa (Yellow)

0.1 ～1.4 MPa (Green) 0.02～0.15 MPa (Yellow)

0.1 ～0.85 MPa (Green)

85% or less of inlet pressure (gauge pressure)

Min. differential pressure 0.05 MPa

Max. pressure reducing ratio

20：1

Max. temperature 220℃

Valve seat leakage 0.01% or less of rated flow

Material

Body Ductile Cast iron

Valve Stainless steel

Valve seat Stainless steel

Diaphragm Stainless steel

Gasket Non asbestos

Body hydraulic test 4.0 MPa 2.0 MPa

* Optional valves (Cv value varies.) [15-100A]

(1) For reduced pressure sensing method, internal sensing method valves will be available

upon request.

(2) Valves with outlet pressure of 0.01~0.02 MPa will be available upon request.

(Inlet pressure: 0.06～0.5 MPa, Max. pressure reducing ratio: 50:1)

Caution

(1) Please collate with attached nameplate and specification of ordered model.

※Please consult factory in case they do not match each other.

■EPDT-014f■

3. Dimensions and Weights

3-1. GP-2000 (Integral mount type)

•The structure differs for nominal sizes 50A to 100A.

(㎜)

Size Screw （JIS Ｒｃ） Flanged （JIS 20KRF）

d ＬＨＨ

１

ＡWeight

（kg）ＬＨＨ

１

ＡWeight

（kg）

15A Rc 1/2 150

398

170

200

14.0 146 398

170

200

15.5

20A Rc 3/4 155

398

170

200

14.0 146 398

170

200

16.0

25A Rc 1 160

404

175

226

18.5 156 404

175

226

21.0

32A Rc 1-1/4

190

434

192

226

21.5 176 434

192

226

24.0

40A Rc 1-1/2

190

434

192

226

21.5 196 434

192

226

24.5

50A Rc 2 220

498

216

276

33.0 222 498

216

276

36.0

65A ――― －

－

―

―――

282 552

251

352

64.5

80A ――― －

－

―

―――

302 572

264

352

71.5

100A ――― －

－

―

―――

342 658

321

401

111

125A ――― －

－

―

―――

400 658

321

401

115

150A ――― －

－

―

―――

465 814

414

502

234

200A ――― －

－

―

―――

469 814

414

502

242

* Different Length (L) and Weight values apply for JIS 10K FF.

3-2. GP-2000 (Remote mount type)

(Screw)

(Flanged)

(Screw)

(Flanged)

■EPDT-014f■

• The structure differs for nominal sizes 50 to 100 .

Screw （JIS Ｒｃ） (㎜)

Size d ＬＨＨ

１

ＡE F Weight

（kg）

15A Rc 1/2 150 398

170

200

175 15.5

20A Rc 3/4 155 398

170

200

175 15.5

25A Rc 1 160 404

175

226

180 20.0

32A Rc 1-1/4 190 434

192

226

188 23.0

40A Rc 1-1/2 190 434

192

226

188 23.0

50A Rc 2 220 498

216

276

195 34.0

Flanged （JIS 20KRF）(㎜)

Size ＬＨＨ

１

ＡE F Weight

（kg）

15A 146 398

170

200

175 15.5

20A 146 398

170

200

175 15.5

25A 156 404

175

226

180 20.0

32A 176 434

192

226

188 23.0

40A 196 434

192

226

188 23.0

50A 222 498

216

276

195 34.0

65A 282 552

251

352

212 64.8

80A 302 572

264

352

223 71.3

100A 342 658

321

401

105

240 111

125A 400 658

321

401

130

240 115

150A 465 814

414

502

150

289 234

200A 469 814

414

502

150

289 242

* Different Length (L) and Weight values apply for JIS 10K FF.

3-3. GPP-2000 Remote mount type (Pilot valve)

3-3. GPM-2000 Remote mount type (Main valve)

(Screw) (Flanged)

■EPDT-014f■

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.

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

24 Spring

27 djusting Screw

34,35,36

Pipe ,B,C

12-1 Main diaphragm chamber

23-1 Pilot diaphragm chamber

56 Reduced press. sensing port

(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)

Fig. 1

■EPDT-014f■

(2) Turing adjusting screw [27] clockwise compresses the spring, which 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 via pipes A [34] and C [36]. This fluid also flows

to the reduced side of the body [1] through pipe B [35] and the orifice of joint B [31] that

connects to the body. (Fig. 2)

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. 3

■EPDT-014f■

(4) Reduced pressure is led to the pilot diaphragm chamber [23]-1 via the sensing pipe and

reduced pressure sensing port [56]. The pilot diaphragm receives the reduced pressure to be

balanced with the spring load. The pilot valve travel is controlled by the spring load 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

(5) When the load on the reduced side is released, pressure in the pilot diaphragm chamber raises

to close the pilot valve. Operating pressure in the main diaphragm chamber is released to the

body via the orifice, and the main valve spring presses the main valve to close. (Fig. 5)

Fig. 5

■EPDT-014f■

5. Nominal Size Selection Method

5.1 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).

5.2 Safety valve setting pressure chart

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).

5.3 Characteristics chart

(1) Flow rate characteristics chart

•Shut-off pressure raise : 0.02 MPa or less

•Offset : 10% or less of setting pressure

(Minimum value: 0.02MPa)

(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 from 0.2 to 2.0 MPa.

■EPDT-014f■

5.4 Nominal size selection chart

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)

■EPDT-014f■

5.5 Nominal size selection calculation formula

The appropriate nominal size can be calculated by obtaining the Cv value for the operating

conditions in question, as shown below.

•Cv value calculation formula

•Rated Cv value table

Nominal size 15A

20A

25A

32A

40A

50A

65A

80A

100A

125A

150A

200A

Rated Cv value

5 7.2

10.9

14.3

18.8

108 112 225 234

0.01 MPa set 2.5

3.6

5.4 7.1

9.4

54 -----

-----

*Please consults factory for internal sensing method valves.

[Flow rate calculation example of GP-2000 pressure reducing valve]

The flow rate of the pressure reducing valve is calculated under the following conditions:

Nominal size 15A, saturated steam, Inlet pressure of 0.6 MPa, Reduced pressure of 0.4

MPa.

1=0.7 [MPa A],

2=0.5 [MPa A], you can find that Cv value of 15A is 5 from the chart.

The following formula is established.

)7.0(

)5.0(

>= P

PPPCv

W)(138

+∆

WCv P P P

=+135

1 2

. ( )∆

)5.07.0(2.05138 +×××

hkg /338

■Secure a safety rate of 80 to 90%

6. Installation

6.1 Example of piping

W: Max. steam flow rate [kg/h]

P1: Inlet pressure [MPa･A]

P2: Reduced pressure [MPa･A]

ΔP: P1－P2 [MPa]

k: 1+0.0013 ×{super-heated steam

temp.[℃]－saturated steam

temp.[℃]}

)PP(P138

+∆

120P

Cv =

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