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Yoshitake GD-28S-NE Product Manual

Pressure reducing valve
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MODEL GD-28S-NE, GD-29S-NE
Pressure Reducing Valve
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
Caution
2. Operation ································································· 5
6. Disposal ·································································· 11
7. Exploded view ··················································· 12 - 13
After Sales Service
PRODUCT MANUAL
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 or may result in only property damage.
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
3.1 Piping example ···················································· 5
3.2 Precaution for installation ··································· 6 - 7
4.1 Precaution for operation ········································ 7
4.2 Adjusting procedure ·········································· 7 - 8
5.1 Troubleshooting ··················································· 8
5.2 Precaution for maintenance and inspection ··············· 9
5.3 Disassembly ················································· 9 - 10
5.4 Precaution for reassembly ···································· 10
5.5 Strainer cleaning procedure ·································· 11

Table of Contents

EPDT-351a

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Summary of Contents for Yoshitake GD-28S-NE

  • Page 1: Table Of Contents

    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.

  • Page 2: Specifications

    1. Specifications 1.1 Specifications Model GD-28S-NE GD-29S-NE Nominal size 20A - 50A 20A - 100A Application Cold and hot water Inlet pressure 2.0 MPa or less 0.20 - 0.35 MPa Reduced pressure 0.30 - 0.70 MPa Min. differential pressure 0.05 MPa...

  • Page 3: Nominal Size Selection

    1.2 Nominal size selection Procedure of nominal size selection 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 100A Rated flow (L/min)

  • Page 4: Flow Rate Characteristics Chart

    Nominal size 65A -100A Flow rate L/min Reduced pressure + 0.1 MPa Reduced pressure + 0.05 MPa 1.3 Flow rate characteristics chart Shut-off pressure rise (0.02 MPa) Set pressure Offset Flow rate Offset (Differential pressure after valve seat 0.15MPa or more) Nominal size Pressure range Reduced pressure range...

  • Page 5: Pressure Characteristics Chart

    1.4 Pressure characteristics chart Inlet pressure MPa This chart shows variation in the reduced pressure when the inlet pressure of 1.0 MPa is changed between 0.35 MPa and 2.0 MPa after the reduced pressure is set at 0.30 MPa. 1.5 Noise characteristics chart (Fluid: Water) Nominal size 15A - 25 A Nominal size 32A - 50 A Inlet pressure:...

  • Page 6: Operation

    By-pass Pressure gauge Pressure gauge Safety relief valve Stop Stop GD-28S-NE Inlet side Outlet side valve valve Pressure reducing valve * Install a strainer on the inlet side of the pressure reducing valve of the nominal size 65A to 100A.

  • Page 7: Precaution For Installation

    3.2 Precaution for installation Warning See the product weight specified in “3. Dimensions and Weights.” * Failure to follow this notice may cause a falling accident of the product, resulting in an injury. When installing a safety relief valve for equipment protection at the outlet side of the product, connect a blow-off pipe to the outlet side of the safety relief valve, and lead it to a place where there is no risk of physical damage even if fluid blows out.

  • Page 8: Operation Procedure

    Model GD-28S-NE, GD-29S-NE (mm) Nominal size 100A 4. Operation procedure 4.1 Precaution for operation When the product is used for hot fluid, do not touch the product with bare hands. Warning * The product having hot fluid may scald your skin.

  • Page 9: Adjusting Procedure

    Remove the domed cap nut [17] and turn the adjusting screw [14] while watching the pressure gauge at the outlet side. • Turn the adjusting screw to the right (clockwise) to increase the reduced pressure. • Turn the adjusting screw to the left (counterclockwise) to decrease the reduced pressure. *If the pressure is not set under the condition that the stop valve on the outlet side is slightly opened, closing the stop valve on the outlet side while operation may lead to shut-off...

  • Page 10: Precaution For Maintenance And Inspection

    5.2 Precaution for maintenance and inspection Warning Completely discharge the pressure inside of the product, piping and equipment before disassembly and inspection. Disassembly and inspection must be done by experienced professional or valve manufacturer. * Failure to follow this notice may result in scalds, injury or contamination on the surroundings due to the residual pressure.

  • Page 11: Precaution For Reassembly

    Part A Washer of disc O-ring Disc cover Disc U-nut 5.4 Precaution for reassembly Caution Check to see that there is no foreign substances inside the body and on each part. *Foreign substances prevent the product from functioning properly. To avoid the problem, remove foreign substances.

  • Page 12: Strainer Cleaning Procedure

    5.5 Strainer cleaning procedure Warning If fluid is hot, do not touch the product directly with bare hands. * Failure to follow this notice may result in scalds. Caution Clean the strainer regularly at least once or twice a year. * Too much deposit of scales or the like decreases the flow rate, which prevents the product from functioning properly.

  • Page 13: Exploded View

    7. Exploded view Nominal size 20A - 50A Washer of disc Note) The parts shown in the rectangle boxes are available as consumable supply EPDT-351a...
  • Page 14 Nominal size 65A - 100A Note) The parts shown in the rectangle boxes are available as consumable supply. EPDT-351a...

  • Page 15: Warranty Information

    ( e.g. in case of corrosion due to outdoor use). Fire, flood, earthquake, thunder and other natural disasters. Consumable parts such as O-ring, gasket, diaphragm and etc. Yoshitake is not liable for any damage or loss caused by malfunction or defect of the product. PDD-046f...

This manual is also suitable for:

Gd-29s-ne