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MODEL GD-26, GD-27, GD-28, GD-29 series
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
1. Usage of the Product ·················································· 1
3. Dimensions and weights ········································ 7 - 10
4. Operation ································································ 10
8. Exploded view ···················································· 17 - 18
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.
Table of Contents
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
5.1 Piping example ··················································· 10
5.2 Precaution for installation ································ 11 - 12
6.1 Precaution for operation ······································· 12
6.2 Adjusting procedure ······································· 12 - 13
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
PDT-008o
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Table of Contents
Related Manuals for Yoshitake GD-26 Series
Summary of Contents for Yoshitake GD-26 Series
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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: Usage Of The Product
1. 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. 2. Specifications 2.1 Specifications Model GD-26-NE GD-27-NE GD-27-N... - Page 3 Model GD-26L-NE Nominal size 15A - 50A Application Cold and hot water Inlet pressure 1.0 MPa or less 0.05 - 0.35 MPa Reduced pressure 0.30 - 0.70 MPa Min. differential 0.05 MPa pressure Max. pressure 10:1 reduction ratio Max. 40°C temperature Body CAC406...
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Page 4: Nominal Size Selection
Please confirm that the indications on the product correspond with the specifications of the ordered product model before use. Caution * If they are different, please contact us without using the product. 2.2 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. - Page 5 Nominal size 65A -100A Nominal size Flow rate L/min Inlet pressure 1.0 - 1.6 MPa Reduced pressure + 0.2 MPa Reduced pressure + 0.1 MPa Reduced pressure + 0.05 MPa PDT-008o...
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Page 6: Flow Rate Characteristics Chart
Nominal size 125A -150A Nominal size Flow rate L/min 0.5 - 1.0 MPa Inlet pressure Reduced pressure + 0.2 MPa Reduced pressure + 0.1 MPa Reduced pressure + 0.05 MPa 3.3 Flow rate characteristics chart Shut-off pressure rise (0.02 MPa) Set pressure Offset Flow rate... -
Page 7: Pressure Characteristics Chart
2.4 Pressure characteristics chart Inlet pressure MPa 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) Nominal size 32A - 50 A Nominal size 15A - 25 A Inlet pressure:... -
Page 8: Dimensions And Weights
3. 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 Weight size (kg) Rc 1/2 37.5 159.5 Rc 3/4 38.5 159.5 Rc 1 Rc 1 1/4 Rc 1 1/2 Rc 2 239.5 Model GD-26S, GD-26S-NE, GD-28S Nominal Weight size... - Page 9 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...
- Page 10 Model GD-27-NE, GD-27-N, GD-27F-N (mm) JIS 10K FF flanged Weight Nominal size (kg) n-φh 4-19 4-19 4-19 239.5 4-19 10.9 4-19 20.0 8-19 22.0 100A 8-19 33.0 125A 8-23 90.0 150A 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.
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Page 11: Operation
Model GD-29S (mm) JIS 16K FF flanged Weight Nominal size (kg) n-φh 4-15 4-19 4-19 4-19 239.5 8-19 10.8 8-19 20.6 8-23 25.0 100A 8-23 36.5 4. Operation Adjusting The spring is compressed by the adjusting screw, screw the diaphragm is pushed down, and thereby the disc directly connected to it is opened. -
Page 12: Precaution For Installation
5.2 Precaution for installation Warning Since the products of the nominal size 125A and 150A are heavy, securely support them using lifting devices or the like when installing. 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 13: Operation Procedure
Model GD-26S, GD-27S, GD-28S, GD-29S, GD-26S-NE, GD-27S-NE (mm) Nominal size 100A 6. Operation procedure 6.1 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. Caution Before leading fluid into the product, close the stop valves at the inlet and outlet of the product and remove foreign substances and scale from the piping completely by using a bypass line. -
Page 14: Adjusting Procedure
Fully open the stop valve at the inlet side slowly, and open the stop valve at the outlet side so that a little fluid can flow through. Remove the domed cap nut [17] (loosen the nut [41] in the case of nominal size 125A and 150A), and turn the adjusting screw [14] while watching the pressure gauge at the outlet side. -
Page 15: Precaution For Maintenance And Inspection
7.2 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 16: Precaution For Reassembly
Nominal size 65A to 150A: Screw the bolt into the valve seat [3], and pull it up. (5) Secure the part A of the spindle [4] (two faces), loosen the U-nut [29] with a tool, and remove the disc [8], and O-ring [28]. Part A Washer of disc O-ring... -
Page 17: Strainer Cleaning Procedure
7.5 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 18: Exploded View
8. Exploded view Nominal size 15A - 50A Washer of disc Note) The parts shown in the rectangle boxes are available as consumable supply PDT-008o... - Page 19 Nominal size 65A - 150A Note) The parts shown in the rectangle boxes are available as consumable supply. PDT-008o...