Yoshitake GD-28S-NE Product Manual Download

Page: 1 / 16

EPDT-351

MODEL GD-28S-NE, GD-29S-NE

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. Specifications

1.1 Specifications ······················································ 1

1.2 Nominal size selection ······································ 2 - 3

1.3 Flow rate characteristics chart ································ 3

1.4 Pressure characteristics chart ································· 4

1.5 Noise characteristics chart ····································· 4

2. Dimensions and weights

··········································

5 - 6

3. Operation

·································································

4. Installation

4.1 Piping example ···················································· 7

4.2 Precaution for installation ··································· 8 - 9

5. Operation procedure

5.1 Precaution for

operation ········································ 9

5.2 Adjusting procedure ········································ 9 - 10

6. Maintenance

6.1 Troubleshooting ·················································· 10

6.2 Precaution for maintenance and inspection ·············· 11

6.3 Disassembly ················································ 11 - 12

6.4 Precaution for reassembly ···································· 12

6.5 Strainer cleaning procedure ·································· 13

7. Exploded view

···················································

14 – 15

After Sales Service

Summary of Contents for GD-28S-NE

Page 1: ...n that if not avoided may result in minor or moderate injury or may result in only property damage Table of Contents 1 Specifications 1 1 Specifications 1 1 2 Nominal size selection 2 3 1 3 Flow rate characteristics chart 3 1 4 Pressure characteristics chart 4 1 5 Noise characteristics chart 4 2 Dimensions and weights 5 6 3 Operation 7 4 Installation 4 1 Piping example 7 4 2 Precaution for install...

Page 2: ... connection port is JIS R1 4 Products complying with the Water Supply Act 1 It can be used under the condition that the maximum pressure reduction ratio is 7 1 within the controllable range shown in the chart below 2 The flange is thicker than the standard value If it is out of controllable range employ two stage pressure reduction or select another model When inlet pressure is 2 0MPa make sure th...

Page 3: ... the product is 0 15 MPa or more Nominal size 15A 20A 25A 32A 40A 50A 65A 80A 100A Rated flow L min 30 40 60 100 150 240 300 450 700 2 If the differential pressure before and after the valve is less than 0 15 MPa select the nominal size from the nominal size selection chart for 20A 50A 65A 100A below Nominal size selection chart Nominal size 20A 50A Reduced pressure MPa Flow rate L min Inlet press...

Page 4: ...00A 1 3 Flow rate characteristics chart Offset Differential pressure after valve seat is 0 15MPa or more Nominal size Pressure range Reduced pressure range Offset 20A 100A A 0 20 0 35MPa 0 10MPa or less B 0 30 0 70MPa 0 15 MPa or less Reduced pressure MPa Flow rate L min Reduced pressure 0 1 MPa Reduced pressure 0 05 MPa Inlet pressure Nominal size ...

Page 5: ...nlet pressure MPa Nominal size 20A 25A Inlet pressure 0 6 MPa Flow rate L min 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 2 0 MPa Reduced pressure 0 3 MPa Inlet pressure 2 0MPa Reduced p...

Page 6: ...51 2 Dimensions and Weights Model GD 28S NE mm Nominal size d L H1 H Weight kg 20A Rc 3 4 135 41 170 2 3 25A Rc 1 135 41 170 2 3 32A Rc 1 1 4 180 57 224 4 9 40A Rc 1 1 2 180 57 224 4 7 50A Rc 2 200 61 239 5 6 7 ...

Page 7: ... g D C n φh 20A 164 41 170 20 56 100 75 4 15 4 4 25A 164 41 170 25 67 125 90 4 19 5 4 32A 204 57 224 32 76 135 100 4 19 8 7 40A 204 57 224 32 81 140 105 4 19 9 0 50A 225 61 239 5 50 96 155 120 8 19 11 8 65A 225 77 329 65 116 175 140 8 19 21 0 80A 237 82 345 80 132 200 160 8 23 25 5 100A 290 94 412 100 160 225 185 8 23 40 5 ...

Page 8: ...iaphragm and the upper and lower force keeps a balance and regulates the valve opening As a result the diaphragm keeps the reduced pressure constant 4 Installation 4 1 Piping example Install a strainer on the inlet side of the pressure reducing valve of nominal size 65A to 100A Make sure that pipes 3m before and after the product both the inlet side and outlet side are of the same diameter Outlet ...

Page 9: ...roduct leads to malfunction of the product It is recommended to use a strainer of 60 mesh or more 5 Install a safety relief valve for equipment protection on the outlet side of the product Failure to follow this notice may result in damage of the equipment 6 Be sure to install pressure gauges on both inlet and outlet sides of the product Failure to follow this notice hampers correct pressure adjus...

Page 10: ...iod completely discharge fluid from the product and pipes and close the stop valves on the inlet and outlet sides of the product Failure to follow this notice causes malfunction of the product due to rusting inside the product and the pipes 5 The set pressure may be affected by ambient temperature external temperature and fluid temperature Install pipes so that the product may not be exposed to di...

Page 11: ...l size selection 3 Pressure adjustment is improper 3 Readjust the pressure in accordance with the given procedure See 5 2 Adjusting procedure 4 Strainer 10 built in the product is clogged 4 Disassemble and clean it See 6 5 Strainer cleaning procedure 5 The strainer installed on the inlet side of the product is clogged 5 Clean the strainer Outside leakage 1 Bolt 18 or 39 got loose 1 Tighten the bol...

Page 12: ...er is a consumable part The replacement interval of the synthetic rubber part greatly varies depending on the use conditions The general guide for the replacement interval is shown below Service life Part name Part No Three years Diaphragm 9 O ring 6 Disc 8 Five years O ring 20 24 26 28 30 45 seal washer 42 6 3 Disassembly 1 Remove the domed cap nut 17 turn the adjusting screw 14 counterclockwise ...

Page 13: ...amaged part 3 Apply silicone grease harmless to humans to the O ring Failure to follow this notice may damage the O ring Assemble the parts in reverse order of disassembly Tighten the bolts 18 of the spring chamber 2 evenly in the diagonal order Bolt 18 of Spring chamber 2 Tightening torque Size Torque 20 50A 10N m 65 100A 30N m Nut 22 of Diaphragm 9 Tightening torque Size Torque 20 25A 8N ｍ 32 50...

Page 14: ...he Figure below 1 Close the stop valve on the inlet side and open the stop valve at the end and discharge the internal pressure from the product completely 2 Turn the strainer cap counterclockwise and remove it 3 Remove the strainer from the strainer cap and wash it in water and remove deposited scale 4 After cleaning assemble the strainer and strainer cap to the body 5 Open the stop valve on the ...

Page 15: ...14 EPDT 351 7 Exploded view GD 28S NE GD 29S NE Nominal size 20A 50A Note The parts shown in the rectangle boxes are available as consumable supply Washer of disc ...

Page 16: ...15 EPDT 351 GD 29S NE Nominal size 65A 100A Note The parts shown in the rectangle boxes are available as consumable supply ...

Search results

Summary of Contents for GD-28S-NE

Reviews:

Related manuals for GD-28S-NE

Brands by name

Popular brands

Yoshitake GD-28S-NE, Product Manual

Search results

Summary of Contents for GD-28S-NE

Reviews:

Related manuals for GD-28S-NE

Brands by name

Popular brands