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Yoshitake PD-3, Product Manual

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■EPDT-310■ 

 

MODEL PD-3 

AIR OPERATED 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 references. 

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. Usage of the Product ·················································· 1 

2. Specifications ···························································· 1 

3. Dimensions and Weights ············································· 2 

4. Operation

 

 ······························································· 3 

5. Installation   ······························································ 4 

5.1 Piping example   ·················································· 4 

5.2 Precaution for installation   ··································· 4-5 

6. Operating procedure   ················································· 5 

6.1 Warning and caution for operation   ·························· 5 

7. Maintenance   ···························································· 6 

7.1 Maintenance   ······················································ 6 

7.2 Troubleshooting ··················································   7 

7.3 Exploded view ····················································· 8 

7.4 Disassembly and reassembly ····························· 9-10 

 

 

 

Summary of Contents for PD-3

Page 1: ...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 Usage of the Product 1 2 Specifications 1 3 Dimensions and Weights 2 4 Operation 3 5 Installation 4 5 1 Piping example 4 5 2 Precaution for installation 4 5 6 Op...

Page 2: ...team air cold and hot water oil other non dangerous fluid 600cSt or less Nominal size 15A to 50A Working pressure 15A 0 to 2 2MPa 1 20A 0 to 1 3MPa 25A 0 to 0 9MPa 25A 0 to 2 2MPa 1 32A 0 to 1 2MPa 40A 0 to 1 0MPa 50A 0 to 0 75MPa Pilot air pressure 15A 0 35 to 1 0MPa 20A 0 45 to 1 0MPa 25A 0 57 to 1 0MPa 25A 0 35 to 1 0MPa 32A 0 35 to 1 0MPa 40A 0 44 to 1 0MPa 50A 0 56 to 1 0MPa Temperature range...

Page 3: ...G Weight kg 15A 0 2 2 0 35 1 0 Rc 1 2 65 135 130 34 5 62 G 1 8 1 1 20A 0 1 3 0 45 1 0 Rc 3 4 75 140 135 34 5 62 G 1 8 1 2 25A 0 0 9 0 57 1 0 Rc 1 90 150 140 34 5 62 G 1 8 1 4 25A 0 2 2 0 35 1 0 Rc 1 90 190 185 55 96 G 1 4 3 0 32A 0 1 2 0 35 1 0 Rc 1 1 4 110 205 200 55 96 G 1 4 3 3 40A 0 1 0 0 44 1 0 Rc 1 1 2 120 210 205 55 96 G 1 4 3 6 50A 0 0 75 0 56 1 0 Rc 2 150 225 215 55 96 G 1 4 4 2 Fig 1 Pos...

Page 4: ...tion When pilot pressure is applied from pilot port pressure is added to bottom part of piston 23 and overcome load of spring 26 and push up piston 23 and open valve disc 5 Also position indicator 27 connected to piston 23 is pushed up at the same time then valve opening can be checked from outside visually Pilot port Pilot port 26 23 26 27 Fig 2 Fig 3 ...

Page 5: ...high temperature fluid can cause scald If using seal agent for piping to connection part prevent it from commingling into the product Seal agent commingles into the product may hamper proper operation 7 If there is possibility of freezing take measures to prevent fluid from freezing Failure to follow this notice may damage the product due to freezing of the product 8 Install pipes so that excessiv...

Page 6: ...re to follow this notice may prevent the product from functioning properly due to the ingress of foreign substances and scale into the product Also foreign substance stuck inside the product leads to malfunction 2 Open each stop valve in the piping to avoid water hammer or condensate obstruction when leading fluid to the product Rapid opening of stop valve may break the product or peripheral equip...

Page 7: ... injury due to the residual pressure Also it may make the surroundings dirty Caution 1 Completely discharge the fluid inside of the product and piping before leaving the product not operated for a long time or at the time of regular inspection Failure to follow this notice may cause malfunction due to occurrence of foreign substance or scale inside of the piping 2 After leaving the product not ope...

Page 8: ...ot port Foreign substance is stuck on the seat part see Fig 7 between valve disc 5 and body 1 Clean the seat part see Fig 7 between valve disc 5 and body 1 There is damage on the seat part see Fig 7 between valve disc 5 and body 1 If there is damage on valve disc 5 replace the actuator set If there is damage on the seat part see Fig 7 of body 1 replace the product Defect of spring 26 inside actuat...

Page 9: ... EPDT 310 7 3 Exploded view Fig 7 Exploded view The parts names shown in are available as consumable supply Pilot port Position indicator Actuator set Circlip Packing case Valve disc Gasket Seat part Body ...

Page 10: ... discharged completely from the product piping and equipment 7 4 1 2 Disassembly procedure 1 Adding pilot pressure through pilot port check that valve disc is up by position indicator 27 2 Grasp and loose hexagonal part of packing case 2 with spanner and remove actuator set from body 1 3 Remove gasket 3 7 4 2 Reassembly 7 4 2 1 Warning and caution for reassembly after disassembly Warning 1 To inst...

Page 11: ...que for actuator set 4 After the reassembly be sure to check opening and closing operation and that there is no leakage from gasket 3 7 4 3 Recommended torque for actuator set To install actuator set on body tighten so that appropriate pressure can be applied on gasket 3 with torque wrench In this case use tightening torque as follows Size Tightening torque 15A 60 Nm 20A 90 Nm 25A 120 Nm 32A 150 N...

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