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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. Dimensions and weights ········································· 4 - 5
3. Operation ································································ 6
5. Exploded view ··················································· 11 - 12
After Sales Service
MODEL GD-26G, GD-27G
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 ································· 3
4.1 Precaution for operation ········································ 7
4.2 Warning and caution for operation ··························· 8
4.3 Piping example ··················································· 8
4.4 Adjusting procedure ············································· 8
4.5 Troubleshooting ·················································· 9
4.6 Warning for disassembly and inspection ················· 10
4.7 Disassembly ····················································· 10
Table of Contents
■ EP D T-088■
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Summary of Contents for Yoshitake GD-26G
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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: Specifications
1. Specifications (1) Please collate with attached nameplate and specification of ordered model. Caution * Please consult factory in case they do not match each other. 1.1 Specifications Model GD-26G GD-27G Nominal size 15 - 50A 25 - 100A Application... -
Page 3: Nominal Size Selection
1.2 Nominal size selection <For Air> Nominal size selection chart Nominal Size [Example] When selecting the nominal size of a pressure reducing valve whose inlet pressure (P ), reduced pressure (P ), and flow rate are 0.3 MPa, 0.2 MPa, and 200 m /h (standard condition), respectively, first find intersection point (A) of the inlet pressure (P ) of 0.3 MPa and the reduced... -
Page 4: Flow Rate Characteristics Chart
Nominal size selection calculation formula [Cv value calculation formula] Q: Max. Fluid flow rate /h (standard condition)] : Inlet pressure [MPa･A] : Reduced pressure [MPa･A] 2940 －P ΔP: P [MPa] G: Specific gravity (Specific gravity per air) t: Fluid temperature [℃] 2550 Nominal size 100A... -
Page 5: Dimensions And Weights
Spring chamber Strainer Valve seat Strainer cap Spindle Diaphragm shell Retainer Spring plate O-Ring Adjusting screw Disc cover Adjusting spring Disc GD-26G (mm) Nominal Weight size (kg) Rc 1/2 37.5 159.5 Rc 3/4 38.5 159.5 Rc 1 Rc 1 1/4... - Page 6 GD-27G 25A-50A GD-27G 65A-100A (mm) JIS 10K FF Flanged Nominal Weight size (kg) n- h 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 ■ EP D T-088■...
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Page 7: Operation
3. Operation The adjusting screw [14] compresses the adjusting spring [15], pushes down on the diaphragm [9], and opens the disc [8] that is directly connected to it. The fluid that entered from the primary side flows out from the upper part of the disk [8] to the secondary side, and at the same time, acts directly on the diaphragm [9] as the secondary side pressure. -
Page 8: Maintenance And Inspection
4. Maintenance and inspection 4.1 Precaution for operation Caution 1. Do not disassemble the product unless it is necessary. * Unnecessary disassembly prevents the product from functioning properly. 2. Before installing the product in the piping, be sure to remove foreign substances and scale from the piping. -
Page 9: Warning And Caution For Operation
4.2 Warning and caution for operation Warning When the product is used for hot fluid, do not touch the product with bare hands. * The product having hot fluid may scald your skin. Caution 1. 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 10: Troubleshooting
4.5 Troubleshooting Trouble Cause Remedy 1. The working pressure is improper. 1. Correct the working pressure. (See “2.1 Specifications” .) 2. The nominal size of the product is 2. Replace the product with the proper Reduced pressure too small for the flow rate for use. nominal size. -
Page 11: Warning For Disassembly And Inspection
4.6 Warning for disassembly and inspection Warning 1. 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 12: Exploded View
5. Exploded view Nominal size 15A - 50A ■ EP D T-088■... - Page 13 Nominal size 65A-100A ■ EP D T-088■...
- Page 14 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. INTERNATIONAL DEPT. 955-5, Miyamae, Irukadeshinden, Komaki, Aichi, 485-0084, Japan...