YAMADA DP-20F/P Maintenance Manual Download Page 14

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Fig.8.1

Fig.8.2

Fig.8.3

8. Instructions for applying lubrication
8.1 Applying Lubricant to the Packing

▪

Apply plenty of grease to a v-groove of the packing.

＜

NOTE

＞

▪

Be careful not to produce air bubbles when applying grease.

8.2 Applying Lubricant to the Center Rod

▪

Apply a small amount of grease the sliding surface of the

center rod.

8.3 Assembly

▪

Attach the v packing to the body, facing the v-groove toward

the air chamber.

＜

NOTE

＞

▪

If the v packing is attached in the wrong direction, an

operation failure may occur.

Summary of Contents for DP-20F/P

Page 1: ...MAINTENANCE MANUAL YAMADA AIR OPERATED DOUBLE DIAPHRAGM PUMP DP 20F P DP 25F P DP 25F C DP 38F P DP 38F C Doc No NDP403M 05 ...

Page 2: ...lt in death or serious injury CAUTION This indicates the existence of potential hazard which if not avoided may result in bodily injury or in physical damage To indicate the contents of danger and damage the following symbols are used together with the above indications This symbol indicates an act that is prohibited prohibition The concrete contents of prohibition are indicated by the side of the...

Page 3: ... 3 3 3 Installation 3 4 Diaphragm and Center rod 4 1 Removal 4 4 2 Inspection 5 4 3 Installation 5 5 Pilot valve Assembly Valve Seats 5 1 Removal 6 5 2 Inspection 6 5 3 Installation 7 6 C Spool valve Assembly and Sleeve Assembly 6 1 Removal 7 6 2 Inspection 9 6 3 Installation 10 7 Retightening of Tie rods 10 8 Instructions for applying lubrication 11 8 1 Applying Lubricant to the Packing 11 8 2 Ap...

Page 4: ...de see Fig 1 2 and the center rod moves to the left The material in material chamber A is pushed out and at the same time material is sucked into material chamber B Through repetition of this operation material is repeatedly taken in and discharged out 2 Tools etc 2 1 General tools Socket wrenches 10 mm 13 mm 17 mm Open end wrenches 13 mm 17 mm Hexagonal wrench Snap ring pliers Flat head screwdriv...

Page 5: ...s from the upper side of the vertical tie rods Then remove the reinforcement plates O rings and out manifolds Fig 3 2 Remove the O rings valve stoppers valve guides balls or flat valves and valve seats Fig 3 3 Turn over the body assembly Fig 3 4 Pull out the four vertical tie rods and remove the base and in manifold Fig 3 4 Remove the O rings valve seats balls or flat valves valve guides and valve...

Page 6: ...t valve If the flat valve is worn out or cracked replace it too Valve seat Fig 3 9 Measure the dimension shown at left and if it is not within the permissible range replace the valve seat Permissible range of valve seat dimension 9 6 12 2 mm 3 3 Installation For installation see Exploded View on the separate sheet and install in the reverse order of disassembly Tightening torque for vertical tie r...

Page 7: ... Then remove the reinforcement plates and out chambers Fig 4 2 Turn the diaphragms in the directions of the arrows to separate the diaphragm on one side Fig 4 3 Then remove O rings DP 25F Remove the packings and wipers from both sides of the body Fig 4 4 Hold the middle of the center rod by hand or clamp it with a vise Then turn the diaphragm to separate from the rod Fig 4 5 NOTE When using a vise...

Page 8: ...nge replace the body Packing Wiper Replace the packing and wiper if they are worn out or damaged Bushing Replace the bushing if the thread is damaged 4 3 Installation For installation see Exploded View on the separate sheet and install in the reverse order of disassembly Soak the wipers in lubricant oil and fit them in the pump body Apply grease to the packings and fit them in the pump body Refer ...

Page 9: ...12606 Remove the O rings pilot valve assembly and springs Fig 5 1 5 2 Inspection Pilot valve assembly Fig 5 2 Measure the diameter and if it is not within the permissible range replace the pilot valve assembly with a new one Permissible range of diameter of pilot valve DP 20F P Ø 4 8 Ø 5 0 mm DP 25F P DP 25F C DP 38F P DP 38F C Ø 6 7 Ø 7 2 mm Valve seat Fig 5 3 Measure the inside diameter and if i...

Page 10: ...l it reaches the body surface Make sure the sealing surface is not dirty or damaged Use the pilot valve remover special tool Part No 712606 Retighten the tie rods before starting the pump See 7 Retightening of tie rods 6 C Spool valve Assembly 6 1 Removal Remove the 4 cap from the stud bolts Fig 6 1 Unscrew the 4 retainer nuts from the valve body assembly to remove the valve body Fig 6 2 Remove th...

Page 11: ...driver under the end of the C spring and lift up on the end outward to release the C spring Fig 6 6 and 6 7 NOTE Once the C spring is removed the arm will be released With snap ring pliers push to remove the interlocking bushing while widening its groove Fig 6 8 and 6 9 NOTE Do not exert excessive force on the spool Do not widen the groove of the bushing unnecessarily Once the interlocking bushing...

Page 12: ...hin the permissible range replace the C spring Permissible range of C spring dimension DP 20F P 25 9 26 5 mm DP 25F P DP 25F C DP 38F P DP 38F C 29 4 30 0 mm Interlocking bush Fig 6 13 Measure the dimensions shown on the left figure and if it is not within the permissible range replace the interlocking bush with a new one Usable range of Interlocking bush dimension Part to measure a DP 20F P 4 8 5...

Page 13: ...retighten the parts indicated by arrows Retighten the tie rods in the following situations immediately before using the pump at the time of quarterly inspections or biannual if the room temperature such as in a clean room is maintained within plus or minus 5 C of the ambient temperature when restarting the pump at low temperature which has stopped running because ambient temperature or liquid temp...

Page 14: ...ing NOTE Be careful not to produce air bubbles when applying grease 8 2 Applying Lubricant to the Center Rod Apply a small amount of grease the sliding surface of the center rod 8 3 Assembly Attach the v packing to the body facing the v groove toward the air chamber NOTE If the v packing is attached in the wrong direction an operation failure may occur ...

Page 15: ......

Page 16: ...Manufactured by YAMADA CORPORATION INTERNATIONAL DEPARTMENT No 1 3 1 Chome Minami Magome Ohta Ku Tokyo 143 8504 Japan PHONE 81 0 3 3777 0241 FAX 81 0 3 3777 0584 201704 NDP403M ...

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