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Table of Contents 

 

 

∙

Warnings and Cautions

 

∙

Table of Contents

 

 

1. Principles of operation

------------------------------------------------------------ 1 

  2. Maintenance and Tools   

 

  2.1 Maintenance ------------------------------------------------------------------------ 1 

 

  2.2 General tools ----------------------------------------------------------------------- 1 

 

  2.3 Special tools ------------------------------------------------------------------------ 1 

 

  2.4 Misc. ---------------------------------------------------------------------------------- 1 

 

3. Ordering Replacement parts

 --------------------------------------------------- 2 

 

4. Balls and Valve seats 

 

  4.1 Removal ------------------------------------------------------------------------------ 2 

 

  4.2 Inspection --------------------------------------------------------------------------- 3 

 

  4.3 Installation ------------------------------------------------------------------------- 3 

 

5. Diaphragm and Center rod 

 

  5.1 Removal ------------------------------------------------------------------------------ 4 

 

  5.2 Inspection --------------------------------------------------------------------------- 5 

 

  5.3 Installation ------------------------------------------------------------------------- 5 

 

6. Throat bearing and Pilot valve Assembly 

 

  6.1 Removal ------------------------------------------------------------------------------ 7 

 

  6.2 Inspection --------------------------------------------------------------------------- 7 

 

  6.3 Installation ------------------------------------------------------------------------- 7 

 

7. C Spool Valve Assembly 

 

  7.1 Removal ------------------------------------------------------------------------------ 8 

 

  7.2 Inspection --------------------------------------------------------------------------- 9 

 

  7.3 Installation ------------------------------------------------------------------------- 9 

 

8. Retightening of Tie rods

 ------------------------------------------------------- 10 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for NDP-P50

Page 1: ...MAINTENANCE MANUAL YAMADA AIR OPERATED DOUBLE DIAPHRAGM PUMP NDP P50 Doc No NDP 476M 03 ...

Page 2: ...ct in an improper manner There is danger of personal injury or property damage Furthermore to indicate the type of danger and damage the following symbols are also used along with those mentioned above This symbol indicates a DON T and will be accompanied by an explanation on something you must not do This symbol indicates a DO and will be accompanied by instructions on something you must do in a ...

Page 3: ... 3 Ordering Replacement parts 2 4 Balls and Valve seats 4 1 Removal 2 4 2 Inspection 3 4 3 Installation 3 5 Diaphragm and Center rod 5 1 Removal 4 5 2 Inspection 5 5 3 Installation 5 6 Throat bearing and Pilot valve Assembly 6 1 Removal 7 6 2 Inspection 7 6 3 Installation 7 7 C Spool Valve Assembly 7 1 Removal 8 7 2 Inspection 9 7 3 Installation 9 8 Retightening of Tie rods 10 ...

Page 4: ... Maintenance Pump maintenance is recommended after each of the following periods Estimated inspection timing Based on water at room temperature Type of diaphragm Operation hours h Type of diaphragm Operation hours h CR 1100 PTFE 200 NBR 1100 TPEE 1600 EPDM 1100 TPO 1600 FKM 250 In critical operations where preventive measures need to be taken it is recommended to inspect diaphragms after every thr...

Page 5: ...antities 4 Balls and Valve seats 4 1 Removal Remove the 6 retainer bolts 1 from the out manifold and remove the protector and out manifold Remove the Silencer Fig 4 1 Remove the ball valve seat and O ring Fig 4 2 Remove the 6 retainer bolts 2 from the in manifold and remove the protector and in manifold Fig 4 1 Remove the ball valve seat and O ring Fig 4 3 Fig 4 2 Fig 4 3 Fig 4 1 ...

Page 6: ...B V B H B S B H T B T 5 0 12 5 mm 1 7 4 1 mm O ring other than PTFE If O ring is worn out or cracked replace it 4 3 Installation For installation see Exploded View on the separate sheet and install in the reverse order of disassembly Tightening torque for manifold retainer bolts 25 N m NOTE Make sure there is no dust on the seal surface and the seal is not damaged Replace the PTFE O ring regardles...

Page 7: ...2 Remove the center disk from one side using the PP wrench special tool Part No 771868 Fig 5 3 After the center disk outside has been removed remove the diaphragm and the center disk inside Remove the center disk and center rod from the opposite side of the main body Fix a double nut to one end of the center rod and take the diaphragm and center disk off the opposite end Fig 5 4 Be careful not to ...

Page 8: ... types For installation see Exploded View on the separate sheet and install in the reverse order of disassembly Apply assembly grease to the center rod and insert it into the main body Insert the cushion Keep the marking OUTSIDE to liquid end for CR NBR EPDM FKM diaphragms Keep the convex side to the outside for TPEE TPO diaphragms Apply threadlocker to center rod and tighten the center disk by th...

Page 9: ...ence with even torque Fig 5 9 B T type For installation see Exploded View on the separate sheet and install in the reverse order of disassembly Apply assembly grease to the center rod and insert it into the main body Keep the convex side to the outside cf Fig 5 10 Put the O rings to both sides of the diaphragm cf Fig 5 10 Apply thread locker to center rod and tighten the center disk by the PP wren...

Page 10: ... inside diameter and if it is outside the usable range replace the throat bearing Usable range of throat bearing Ø 25 04 Ø 25 13mm O ring Packing If the O ring is worn out or cracked replace it Pilot valve If the pilot valve is worn out or cracked replace it 6 3 Installation For installation see Exploded View on the separate sheet and install in the reverse order of disassembly Tightening torque f...

Page 11: ...r bolts and remove cap A and cap B Fig 7 1 Draw out the C spool valve assembly and remove the seal ring from the C spool valve assembly Remove the spring stopper Fig 7 2 Remove the sleeve using the sleeve remover special tool Part number 713180 Fig 7 3 Fig 7 1 Fig 7 2 Fig 7 3 ...

Page 12: ...5 Ø 33 35 mm O ring If the O ring is worn out or cracked replace it NOTE C Spool Valve Assembly must be replaced as a complete set Unable to replace individual component 7 3 Installation For installation see Exploded View on the separate sheet and install in the reverse order of disassembly Install the sleeve using the sleeve remover special tool Part No 713180 At this point apply assembly oil aro...

Page 13: ...fore start up 2 There are any leaks of material on daily inspecting a pump NOTE Retighten the Out chamber and then the manifold in this order Fig 8 1 Tighten the bolts in the order shown Fig 8 2 Retain bolts for the out chamber Retain bolts for the manifold 35 N m 20 N m Fig 8 1 ...

Page 14: ... FAX 31 0 74 242 1055 E mail sales yamada nl Web www yamada europe com Manufactured by YAMADA CORPORATION INTERNATIONAL DEPARTMENT 1 1 3 Minami Magome Ota ku Tokyo 143 8504 Japan PHONE 81 0 3 3777 0241 FAX 81 0 3 3777 0584 E mail intl yamadacorp co jp Web www yamadacorp co jp 202009 2479 NDP476M ...

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