YAMADA DP-20F/P Maintenance Manual
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YAMADA DP-20F/P Maintenance Manual

Yamada air-operated double diaphragm pump
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Doc. No.
NDP403M-05
MAINTENANCE MANUAL
YAMADA AIR-OPERATED DOUBLE DIAPHRAGM PUMP
DP-20F/P
DP-25F/P
DP-25F/C
DP-38F/P
DP-38F/C

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Summary of Contents for YAMADA DP-20F/P

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

  • Page 2: Warnings And Cautions

    After reading the manual, keep it in an easy-to-access place so that the user may refer to it whenever necessary. This maintenance manual describes the items required for maintenance of the Yamada DP-F/P, DP-F/C series Diaphragm Pumps. This document is based on the products that are manufactured in March 2011. NOTE that its contents are subject to change as a result of specification changes to be made in future.

  • 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 Others ------------------------------------------------------------------------------- 1 .Balls, Flat valves and Valve seats 3.1 Removal ---------------------------------------------------------------------------- 2 3.2 Inspection ■...

  • 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, Flat Valves And Valve Seats

    3. Balls, Flat valves and Valve seats 3.1 Removal ▪ Remove the 8 caps (4 on the top and 4 on the bottom) from both sides of the vertical tie rods. [Fig.3.1] Fig.3.1 ▪ Unscrew the 4 retainer nuts from the upper side of the vertical tie rods.

  • Page 6: Inspection Ball Valve Types

    ▪ Replace the PTFE O rings regardless of its condition. Fig.3.10 ▪ Make sure that the directions of each coned disk spring DP-20F/P, DP-25F/P are correct. [Fig.3.10, Fig.3.11] ▪ Retighten the tie rods before starting the pump. (See [7. Retightening of tie rods])

  • Page 7: Diaphragm And Center Rod

    4. Diaphragm and Center rod 4.1 Removal ▪ Remove the balls or flat valves, valve seats, valve guides, valve stoppers, etc. (see [3.1 Removal]) ▪ Remove the 12 caps (16 caps for DP-38F/□) from both sides of horizontal tie rods. [Fig.4.1] Fig.4.1 ▪...

  • Page 8: Inspection

    Measure the diameter, and if it is not within the Fig.4.7 permissible range, replace the center rod. Permissible range of center rod diameter DP-20F/P Ø 17.92 - Ø 17.98 mm DP-25F/P, DP-25F/C Ø 23.92 - Ø 23.98 mm DP-38F/P, DP-38F/C Ø...

  • Page 9: Pilot Valve Assembly, Valve Seats

    DP-20F/P, DP-25F/P Fig.4.10 <NOTE> ▪ Make sure the sealing surface is not dirty or damaged. ▪ Tighten the nuts evenly and alternately in a diagonal sequence to the specified torque. ▪ Make sure that the directions of each coned disk spring are correct.

  • Page 10: Installation

    5.3 Installation For installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly. <NOTE> ▪ The O ring on the valve seat is easily separated. Ensure that the O ring is fitted on the valve seat when attaching the valve seat to the body.
  • Page 11 ▪ Use pliers to pull out the C spool valve assembly. [Fig.6.4] Fig.6.4 ▪ Remove the sleeve from the valve body using the sleeve remover (special tool: Part No. 713148). [Fig.6.5] ＜NOTE＞ ▪ Be careful not to damage or crack the sliding surface when pulling out the C spool valve assembly and sleeve.

  • Page 12: Inspection

    Replace the O ring if it is worn out or cracked. <NOTE> ▪ Be sure to replace the spool and sleeve together as a complete set. (Set No : DP-20F/P 804395 DP-25,38F/P 804396 DP-25,38F/C 804170) ▪ C spring [Fig.6.12] Measure the dimension shown on the left figure, and if it is not within the permissible range, replace the C spring.

  • Page 13: Installation

    6.3 Installation For installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly. Tightening torque for Valve body installation bolts DP-20F/P 2 N•m DP-25F/P, DP-25F/C 7 N•m DP-38F/P, DP-38F/C <NOTE> ▪ Make sure the sealing surface is not dirty or damaged.

  • Page 14: Instructions For Applying Lubrication

    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. Fig.8.1 8.2 Applying Lubricant to the Center Rod ▪...
  • 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 : +81-(0)3-3777-0584 201704 NDP403M...

This manual is also suitable for:

Dp-25f/cDp-38f/cDp-38f/pDp-25f/p

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