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Yoshitake GD-20R, Руководство пользователя

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EPDT-023c

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Model GD-20R 

Primary Pressure Regulating Valve 

Pressure Sustaining Valve

 

 

Please read this bulletin thoroughly before using the pressure reducing valve, so that you 
may do so correctly and safely. Please carefully store this bulletin in a handy place. 

 

――――――The following safety symbols are used in this manual. ――――― 

 

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. 

 

Contents 

 
1. Specifications & Performance 

1.1 Specifications ··········································································· 1 
1.2 Flow Rate Characteristics Chart ····················································· 2 

2. Dimensions & Weight ····································································· 2 
3. Operation ····················································································· 4 
4. Nominal Size Selection Method 

4.1 Nominal Size Selection Chart ························································· 5 
4.2 Selection Formula for Nominal Size ················································· 7 
4.3

 

Pressure Sustaining Valve Selection ················································ 8 

5. Installation 

5.1 Example of Piping ······································································· 9 
5.2

 

Precautions before Operation ························································ 11 

6. Operating Procedure 

6.1 Precautions for Operation ··························································· 12 
6.2 Adjustment Procedure ································································ 13 

7. Maintenance Procedure 

7.1 Troubleshooting ········································································ 14 
7.2 Precautions for Maintenance ························································ 15 
7.3 Periodic Inspection ···································································· 15 
7.4 Disassembly ············································································· 15 
7.5 Assembly ·················································································· 16 

8 Exploded Drawing ··········································································· 17 

After Sales Service 

Содержание GD-20R

Страница 1: ...that if not avoided may result in minor or moderate injury Contents 1 Specifications Performance 1 1 Specifications 1 1 2 Flow Rate Characteristics Chart 2 2 Dimensions Weight 2 3 Operation 4 4 Nomin...

Страница 2: ...erature 5 80 Connection JIS 10K FF Flanged Coefficient of viscosity cSt 600 or less Surface treatment 15 100A Electrodeposition paint 125 150A Tar paint Black or electrodeposition paint External sensi...

Страница 3: ...guide 22 O ring 6 Spindle 23 O ring 8 Valve seat 24 O ring 9 Valve 25 Conductor Pipe 11 Diaphragm 26 Air Vent 12 Spring Plate 27 O ring 13 Spring Plate 28 Bolt 14 Adjusting Spring 29 Bolt 15 Adjusting...

Страница 4: ...27 O ring 11 Diaphragm 28 Bolt 12 Spring Plate 29 Bolt 13 Spring Plate 33 O ring 14 Adjusting Spring 34 Bolt 15 Adjusting Screw 35 O ring 16 Lock Nut 36 Needle valve 17 U Nut 37 Cover gasket 19 U Nut...

Страница 5: ...ng a conductor pipe 15 and the sensing chamber under the diaphragm 11 If the pressure of the sensing chamber becomes higher than setting pressure the load of the diaphragm 11 bottom will overcome the...

Страница 6: ...ial 0 2MPa to come across the flow rate 5 5m3 h and regard this point as A Point A is between nominal size 25A and 32A Select the lager nominal size 32A For example take a pressure regulating valve wh...

Страница 7: ...follows Find the intersection point A of the inlet pressure P1 0 5 MPa and outlet pressure P2 0 3 MPa and go straight down from the point A to find the intersection B crossing the flow rate line The...

Страница 8: ...velocity 3m s 2 20 3 96 6 46 10 81 14 67 23 72 39 09 55 21 94 00 145 05 204 21 For liquids with viscosity apply the following viscosity correction calculation formula Find the Max Flow rate V when the...

Страница 9: ...piping system and nominal diameter If the judgment is passed you can use the product with the specifications of the selection result Examples Shut off down pressure See table 9 Pb MPa 0 02 Minimum se...

Страница 10: ...o the water as possible By pass stop valve Globe valve Model TA 2 3 Air Vent Press gauge By pass stop valve Model SU 20 Strainer Stop valve Stop valve Model PG 2 Press gauge Model PG 2 Press gauge Sto...

Страница 11: ...ssure Sustaining Valve 15 80A Compound press gauge Globe valve By pass stop valve Model TA 2 3 Air Vent About 1m Depending on the piping size it may exceed 1m but there is no particular problem Stop v...

Страница 12: ...oduct 10 Be sure to install a strainer at the inlet side of the product Ingress of foreign substances or scale into the product leads to malfunction of the product It is recommended to use a strainer...

Страница 13: ...is used for hot fluid do not touch the product with bare hands The product having hot fluid may scald your skin 2 Before leading fluid make sure that there is no danger even if fluid leads to the pip...

Страница 14: ...tarting the systems Check if the set pressure changes when turning the adjustment screw see Fig 13 Check whether the primary pressure is stable at the adjusted pressure If there is any abnormality ple...

Страница 15: ...leaking 5 Diaphragm 11 or O rings is broken 1 Disassemble and clean If scratches exist replace them 2 Re adjust according to the adjustment procedure Refer to the 6 2 Adjustment Procedure 3 Disassemb...

Страница 16: ...be maintained at the set pressure Outside leakage There should be no outside leakage Abnormal noise There should be no abnormal noise Periodic inspection once a year Items Standards for Inspection Va...

Страница 17: ...embly When assembling follow the steps in the reverse order of disassembly Precautions during assembly 1 Make sure that the diaphragm 11 the valve seat 8 and the valve 9 have no scratches 2 Apply the...

Страница 18: ...17 EPDT 023c 8 Fig 16 Parts with in the are consumable Please contact us for purchase of these consumable parts...

Страница 19: ...improvement without any prior notice After the discontinuation of the product Yoshitake supplies the repair parts for 5 years otherwise individually agreed 3 This warranty does not cover the damage d...

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