Yoshitake GD-26 Series Manual de usuario

PDT-008o

MODEL GD-26, GD-27, GD-28, GD-29 series

Pressure Reducing Valve

PRODUCT

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 reference.

The symbols used in this manual have the following meanings.

Warning

This symbol indicates a potentially hazardous situation that, if not avoided, could

result in death or serious injury.

Caution

This symbol indicates a hazardous situation that, if not avoided, may result in

minor or moderate injury or may result in only property damage.

Table of Contents

1. Usage of the Product·················································· 1

2. Specifications

2.1 Specifications·················································· 1 - 3

2.2 Nominal size selection ······································ 3 - 5

2.3 Flow rate characteristics chart ································ 5

2.4 Pressure characteristics chart································· 6

2.5 Noise characteristics chart ····································· 6

3. Dimensions and weights········································ 7 - 10

4. Operation································································10

5. Installation

5.1 Piping example···················································10

5.2 Precaution for installation································ 11 - 12

6. Operation procedure

6.1 Precaution for operation ······································· 12

6.2 Adjusting procedure······································· 12 - 13

7. Maintenance

7.1 Troubleshooting··················································13

7.2 Precaution for maintenance and inspection ·············· 14

7.3 Disassembly ················································14 - 15

7.4 Precaution for reassembly ···································· 15

7.5 Strainer cleaning procedure ·································· 16

8. Exploded view····················································17 - 18

PDT-008o

Usage of the Product

This product can be used for a wide range of pressure control in a water supply system and others for the

general households, multistoried buildings, industrial plants, and plant facilities.

. Specifications

2.1 Specifications

Model GD-26-NE GD-27-NE GD-27-N GD-27F-N GD-28-NE GD-29-NE

Nominal size 15A - 50A 25A - 100A

125, 150A 15A - 50A 25A - 100A

Application Cold and hot water

Inlet pressure 1.0 MPa or less 1.6 MPa or less

Reduced

pressure

A 0.05 - 0.35 MPa 0.05 - 0.20 MPa 0.05 - 0.35 MPa

B 0.30 - 0.70 MPa 0.20 - 0.50 MPa 0.30 - 0.70 MPa

Min. differential

pressure 0.05 MPa

Max. pressure

reduction ratio 10:1 *

Max.

temperature 90°C 80°C 90°C

Material

Body CAC406

Valve seat CAC406

Valve disc FKM NBR FKM

Diaphragm EPDM NBR FKM EPDM

Pipe end core None

Connection JIS Rc

screwed

JIS 10K FF

flanged

JIS Rc

screwed

JIS 16K FF

flanged

* The maximum differential pressure of the products of 125A and 150A is 0.8 MPa.

The products of the nominal size 15A to 50A incorporate a strainer (40 mesh).

Pressure gauge connection port is JIS R1/8.

All the above models conform to the standard of the Japanese Water Supply Act.

Available with GD-26-NED and GD-27NED with wetted parts made of stainless steel.

PDT-008o

Model GD-26L-NE

Nominal size 15A - 50A

Application Cold and hot water

Inlet pressure 1.0 MPa or less

Reduced

pressure

A 0.05 - 0.35 MPa

B 0.30 - 0.70 MPa

Min. differential

pressure 0.05 MPa

Max. pressure

reduction ratio 10:1

Max.

temperature 40°C

Material

Body CAC406

Valve seat CAC406

Valve disc FKM

Diaphragm EPDM

Pipe end core

Used both for polyvinyl chloride lined steel pipe and powdered polyethylene lined steel pipe

Connection JIS Rc screwed

The products of the nominal size 15A to 50A incorporate a strainer (40 mesh).

Pressure gauge connection port is JIS R1/8.

The GD-26L-NE conforms to the standard of the Japanese Water Supply Act.

Model GD-26S GD-27S GD-26S-NE

GD-27S-NE

GD-28S GD-29S

Nominal size 20A - 50A 20A - 100A

20A - 50A 20A - 100A

Application Cold and hot water

Inlet pressure 1.0 MPa or less 1.6 MPa or less

Reduced

pressure

A 0.05 - 0.35 MPa

B 0.30 - 0.70 MPa

Min. differential

pressure 0.05 MPa

Max. pressure

reduction ratio 10:1

Max.

temperature 90°C

Material

Body SCS13

Valve seat SCS13

Valve disc EPDM FKM EPDM

Diaphragm EPDM

Pipe end core None

Connection JIS Rc

screwed

JIS 10K FF

flanged

JIS Rc

screwed

JIS 10K FF

flanged

JIS Rc

screwed

JIS 16K FF

flanged

The products of the nominal size 15A to 50A incorporate a strainer (40 mesh).

Pressure gauge connection port is JIS R1/4.

Models conforming to Japanese Water Supply Act are GD-26S-NE and GD-27S-NE. These valve discs

are made of FKM.

PDT-008o

2.2 Nominal size selection

Procedure of nominal size selection

1. If the pressure difference before and after the product is 0.15 MPa or more, choose the nominal size

from the rated flow table below.

Rated flow table (The pressure difference before and after the product is 0.15 MPa or more)

Nominal size 15A

20A

25A

32A

40A

50A

65A

80A

100A

125A

150A

Rated flow (L/min) 30 40 60 100

150

250

300

450

700

1600

1800

2. If the pressure difference before and after the product is less than 0.15 MPa, choose the nominal

size from the nominal size selection charts (for 15A - 50A, 65A - 100A, and 125A - 150A) below.

Nominal size selection chart

Nominal size 15A - 50A

Caution

Please confirm that the indications on the product correspond with the specifications

of the ordered product model before use.

* If they are different, please contact us without using the product.

Flow rate

L/min

Inlet pressure

Reduced pressure + 0.2 MPa

Reduced pressure + 0.1 MPa

Reduced pressure + 0.05 MPa

Nominal size

1.0 -

1.6 MP

Reduced pressure MPa

PDT-008o

Nominal size 65A -100A

Flow rate L/min

Inlet pressure

Reduced pressure + 0.2 MPa

Reduced pressure + 0.1 MPa

Reduced pressure + 0.05 MPa

Nominal size

1.0 - 1.6 MPa

Reduced pressure MPa

PDT-008o

Flow

rate

Set pressure

Shut-off pressure rise

(0.02 MPa)

Min. adjustable

flow rate

Rated flow

Offset

Reduced pressure

Nominal size 125A -150A

3.3 Flow rate characteristics chart

Offset

Nominal size

Pressure range

Reduced

pressure range

Offset

15A - 100A

A 0.05 - 0.35 MPa 0.05 MPa or less

B 0.30 - 0.70 MPa 0.10 MPa or less

125A - 150A

A 0.05 - 0.20MPa 0.07 MPa or less

B 0.20 - 0.50MPa 0.12 MPa or less

Nominal size

Inlet pressure

Reduced pressure + 0.2 MPa

Reduced pressure + 0.1 MPa

Reduced pressure + 0.05 MPa

Flow rate L/min

0.5

1.0 MPa

Reduced pressure MPa

PDT-008o

2.4 Pressure characteristics chart

This chart shows variation in the reduced pressure when the inlet pressure of 0.60 MPa is changed

between 0.15 MPa and 1.0 MPa after the reduced pressure is set at 0.10 MPa.

2.5 Noise characteristics chart (Fluid: Water)

Inlet pressure MPa

Nominal size 15A - 25 A

Inlet pressure: 0.6 MPa

Reduced pressure: 0.2 MPa

Flow rate L/min

Nominal size: 15 A

Nominal size: 20 A

Nominal size: 25 A

Nominal size 32A - 50 A

Flow rate L/min

Nominal size: 32 A

Nominal size: 40 A

Nominal size: 50 A

Nominal size 65A - 100 A

Flow rate L/min

Nominal size: 65 A

Nominal size: 80 A

Nominal size: 100 A

Reduced pressure MPa

Inlet pressure: 0.6 MPa

Reduced pressure: 0.2 MPa

Inlet pressure: 0.6 MPa

Reduced pressure: 0.2 MPa

Inlet pressure: 0.6 MPa

Reduced pressure: 0.2 MPa

Noise

PDT-008o

Dimensions and

Weights

Model GD-26-NE, GD-28-NE, GD-26L-NE, GD-26S, GD-26S-NE, GD-28S

Model GD-26-NE, GD-28-NE, GD-26L-NE

Nominal

size d L H1H Weight

(kg)

15A Rc 1/2 115 37.5 159.5 1.6

20A Rc 3/4 120 38.5 159.5 1.7

25A Rc 1 135 41 170 2.1

32A Rc 1 1/4

180 57 224 4.0

40A Rc 1 1/2

180 57 224 4.4

50A Rc 2 200 61 239.5 6.5

Model GD-26S, GD-26S-NE, GD-28S

Nominal

size d L H1H Weight

(kg)

20A Rc 3/4 135 41 170 2.2

25A Rc 1 135 41 170 2.2

32A Rc 1 1/4 180 57 224 4.7

40A Rc 1 1/2 180 57 224 4.5

50A Rc 2 200 61 239.5

6.5

PDT-008o

Model GD-27-NE, GD-29-NE, GD-27S, GD-27S-NE, GD-29S

Nominal size 25A - 50A

Nominal size 65A - 100A

Model GD-27-N, GD-27F-N

Nominal size 125A, 150A

PDT-008o

Model GD-27-NE, GD-27-N, GD-27F-N

(mm)

Nominal size

L H1H JIS 10K FF flanged Weight

(kg)

d D C t n-φh

25A 160 41 170 25 125

90 14

4-19 5.1

32A 200 57 224 32 135

100 16

4-19 7.5

40A 200 57 224 40 140

105 16

4-19 7.7

50A 220 61 239.5

50 155

120 16

4-19 10.9

65A 220 77 329 65 175

140 18

4-19 20.0

80A 230 82 345 80 185

150 18

8-19 22.0

100A 270 94 412 100

210

175 18

8-19 33.0

125A 360 148 771 125

250

210 20

8-23 90.0

150A 380 148 771 150

280

240 22

8-23 97.0

・The nominal size of GD-27-NE is 25A to 100A. The nominal size of GD-27-N and

GD-27F-N is 125A and 150A only.

Model GD-29-NE

(mm)

Nominal size

L H1H JIS 16K FF flanged Weight

(kg)

d D C t n-φh

25A 160 41 170 25 125

90 14

4-19 5.1

32A 200 57 224 32 135

100 16

4-19 7.5

40A 200 57 224 40 140

105 16

4-19 7.7

50A 220 61 239.5

50 155

120 16

8-19 10.9

65A 220 77 329 65 175

140 18

8-19 20.0

80A 234 82 345 80 200

160 20

8-23 24.0

100A 278 94 412 100

225

185 22

8-23 36.5

Model GD-27S, GD-27S-NE

(mm)

Nominal size

L H1H JIS 10K FF flanged Weight

(kg)

d D C t n-φh

20A 160 41 170 20 100

75 14

4-15 3.9

25A 160 41 170 25 125

90 14

4-19 4.8

32A 200 57 224 32 135

100 16

4-19 8.0

40A 200 57 224 32 140

105 16

4-19 8.3

50A 220 61 239.5

50 155

120 16

4-19 10.8

65A 220 77 329 65 175

140 18

4-19 20.6

80A 230 82 345 80 185

150 18

8-19 22.0

100A 270 94 412 100

210

175 18

8-19 34.5

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