YAMADA NDP-20 Maintenance Manual
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YAMADA NDP-20 Maintenance Manual

Air-operated diaphragm pumps
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Doc. No.
NDP 187M-10
MAINTENANCE MANUAL
YAMADA AIR-OPERATED DIAPHRAGM PUMPS
NDP-20
NDP-25
NDP-32

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Summary of Contents for YAMADA NDP-20

  • Page 1 Doc. No. NDP 187M-10 MAINTENANCE MANUAL YAMADA AIR-OPERATED DIAPHRAGM PUMPS NDP-20 NDP-25 NDP-32...

  • Page 2: Warnings And Cautions

    After reading this document, be sure to keep it handy for future reference. This maintenance manual covers what you should know about maintenance of the Yamada NDP-20 series, NDP-25 and NDP-32 series Diaphragm Pumps. This edition is based on the standards for the May 2015 production run. Remember, the specifications are always subject to change;...

  • Page 3: Table Of Contents

    Table of Contents Warnings and Cautions · Table of Contents · 1. Principles of operation ···································································· 1 2. Tools, etc. 2.1 General tools················································································ 1 2.2 Special tools················································································· 1 2.3 Misc. ·························································································· 1 3. Ordering Replacement parts ··························································· 1 4. Balls and Valve seats 4.1 Removal ■...

  • Page 4: Principles Of Operation

    1. Principles of operation There are two diaphragms fixed to the center rod, one at each end. When compressed air is supplied to air chamber b (right side, see Fig.1.1), the center rod moves to the right, the material in material chamber B is pushed out, and at the same time material is sucked into material chamber A.

  • Page 5: Balls And Valve Seats

    4. Balls and Valve seats 4.1 Removal ■ □ □ □ [-D], BS , BF types ▪ Remove the 4 retainer bolts from the out manifold, and remove the out manifold. [Fig.4.1] ▪ Remove the O ring, valve stopper, ball and valve seat. [Fig.4.2] ▪...
  • Page 6 ■ □ □ , BV types ▪ Remove the 4 retainer nuts from the upper side of tie rods, and remove the out manifold. [Fig.4.5] <NOTE> ▪ When the retainer nuts both sides of the tie rod remove, the in manifold removes. ▪...

  • Page 7: Inspection

    4.2 Inspection ▪ Ball [Fig.4.9] Measure the outside diameter, and if it is outside the usable range, replace the ball. Usable range of Ball NDP-20 24.3 ~ S 27.8 mm Ø Ø NDP-25 31.5 ~ S 36.1 mm Ø Ø...

  • Page 8: Diaphragm And Center Rod

    5. Diaphragm and Center rod 5.1 Removal ■ □ □ □ [-D], BS , BF types ▪ Remove the ball and valve seat etc. (see [4.1 Removal □ □ □ [-D], BS , BF types] ) ▪ Remove the 12 retainer bolts from the out chamber, and remove the out chamber.

  • Page 9: Inspection

    ▪ Remove the center disk from one side using the Accessory tool (special tool: Part No. 771244). [Fig.5.5] ▪ 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.

  • Page 10: Installation B C[-D], B □ N[-D], B □ E, B □ V, B □ H[-D], B □ S, B □ H/T Types

    Tightening torque for out chamber. □ □ □ □ C, B N, B E, B 10 N•m NDP-20 □ □ □ 13 N•m H, B S, B □ □ □ □...

  • Page 11: Throat Bearing And Pilot Valve Assembly

    6. Throat bearing and Pilot valve Assembly 6.1 Removal ▪ Remove the diaphragm and center rod (see [5.1 Removal]). ▪ Remove the 8 retainer bolts from the air chamber, and remove the air chamber and gasket. [Fig.6.1] ▪ Draw out the pilot valve assembly. [Fig.6.2] ▪...

  • Page 12: C Spool Valve Assembly And Sleeve Assembly

    7. C Spool Valve Assembly and Sleeve Assembly 7.1 Removal ▪ Remove the 6 retainer bolts from the valve body, and remove the valve body. [Fig.7.1] ▪ Remove the 8 cap A and cap B retainer bolts, and remove cap A, cap B, packing, plain washer, cushion and gasket. [Fig.7.2] ▪...

  • Page 13: Retightening Of Tie Rods

    Retainer bolts from the out chamber manifold B□C[-D], B□N[-D], B□E, B□V 10 N•m 10 N•m B□T 13 N•m 20 N•m NDP-20 B□H[-D], B□S, B□H/T 13 N•m 10 N•m IN SIDE 15 N•m BAT-D 13 N•m OUT SIDE 20 N•m Retainer bolts from the...
  • Page 14 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 : +81-(0)3-3777-0584 201612 NDP187M...

This manual is also suitable for:

Ndp-32Ndp-25

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