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  • PUG 6/02REPLACES PUG 10/01

  • 1. The Wilden Pumpa. AODDP: Air-Operated Double-Diaphragm Pump 1b. How It Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2c. Pump Availability Charts . . . . . . . . . . . . . . . . . . . 3d. Why Buy a Wilden AODDP . . . . . . . . . . . . . . . . . 3

    2. Site Selectiona. Self-Priming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4b. Positive Suction Head . . . . . . . . . . . . . . . . . . . . . 4c. Submerged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

    3. Part Identification Charta. Exploded View. . . . . . . . . . . . . . . . . . . . . . . . . . . 5b. Part Legend. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

    4. Air Distribution Systemsa. System Availability

    and Product Line Strategy . . . . . . . . . . . . . . . . 6-7b. Turbo-Flo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8c. Wil-Flo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8d. Pro-Flo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9e. Accu-Flo. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9f. Accu-Flo Solenoid Coil Options. . . . . . . . . . . . 10

    5. Elastomersa. Rubber Compounds . . . . . . . . . . . . . . . . . . . . . . 10

    Ultra-Flex Diaphragms. . . . . . . . . . . . . . . . . . . 11b. Thermoplastic Compounds . . . . . . . . . . . . . . . . . 11c. Teflon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11d. Specialty Diaphragms . . . . . . . . . . . . . . . . . . . . . 11e. Elastomer Options. . . . . . . . . . . . . . . . . . . . . . . . 12

    6. Diaphragm Assemblya. Rubber/TPE Fitted Pumps . . . . . . . . . . . . . . . . . 13b. Teflon Fitted Pumps . . . . . . . . . . . . . . . . . . . . . . 13c. Ultra-Flex Fitted Pumps. . . . . . . . . . . . . . . . . . 13

    7. Pump Selectiona. Pump Selection Chart . . . . . . . . . . . . . . . . . . . . . 13b. Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14c. Solids Handling Capability . . . . . . . . . . . . . . . . . 14

    d. Suction Lift. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14e. Performance Curves . . . . . . . . . . . . . . . . . . . . . . 14f. Total Dynamic Head Calculation . . . . . . . . . . . . . 14g. Chemical Compatibility . . . . . . . . . . . . . . . . . . . . 14h. Temperature Limitations . . . . . . . . . . . . . . . . . . . 14i. Abrasion Resistance . . . . . . . . . . . . . . . . . . . . . . 15j. Cavitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

    8. Pump Designation System . . . . . . . . . . . . . . . . . . 16

    9. Installationa. Pre-Installation Checklist. . . . . . . . . . . . . . . . . . . 17b. Suggested Installation . . . . . . . . . . . . . . . . . . . 17-18c. Accu-Flo Installation . . . . . . . . . . . . . . . . . . . . 18

    10. Maintenancea. Assembly/Re-assembly. . . . . . . . . . . . . . . . . . . . 19b. Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19c. Mean Time to Failure . . . . . . . . . . . . . . . . . . . . . 19d. Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . 19e. Disassembly Overview . . . . . . . . . . . . . . . . . . . . 19

    11. Wilden Accessoriesa. SD Equalizer Surge Dampener . . . . . . . . . . . . . 20b. BF Equalizer Series . . . . . . . . . . . . . . . . . . . . . . 20c. FCSI (Flow Control System I) . . . . . . . . . . . . . . . 20d. Solenoid Pump Controller (SPC I) . . . . . . . . . . . 20e. Wil-Gard II . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21f. Drum Pump Kit . . . . . . . . . . . . . . . . . . . . . . . . . . 21g. Automatic Powder Valve (APV). . . . . . . . . . . . . . 21h. 2 for 1 System. . . . . . . . . . . . . . . . . . . . . . . . . . . 21i. Air-Tech Pneumatic Pump Controllers. . . . . . . . 21

    12. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

    13. Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

    14. Safety Supplement . . . . . . . . . . . . . . . . . . . . . . 23-24

    15. Conversion Tables . . . . . . . . . . . . . . . . . . . . . . . . . 25

    PUMP USERS GUIDE i WILDEN PUMP & ENGINEERING CO.

    TABLE OF CONTENTS

    Wildens Pump Users Guide was designed to familiarizeyou with the operation and mechanics of Wilden air-operat-ed double-diaphragm pumps and accessories. This guide isto be used as a supplement with your pumps EngineeringOperation and Maintenance manual (EOM). The PumpUsers Guide is a resource for the following: Pump operationprinciples, application alternatives, air distribution systems,elastomers, pump selection, pump designation system,

    pump performance, pump installation, pump operation, trou-bleshooting, and pump maintenance. In addition, a list ofapplicable pump accessories, pump warranty, and safetyprecautions are discussed.

    For best results this guide should be used in conjunction withthe EOM manual specific to your pump model.

    PAGE PAGE

  • WILDEN PUMP & ENGINEERING CO. 1 PUMP USERS GUIDE

    1a. THE WILDEN PUMP AODDP

    1. Air Chamber: The air chamber is the chamber thathouses the air which powers the diaphragms.

    2. Air Distribution System: The air distribution system isthe heart of the pump. The air distribution system is themechanism that shifts the pump in order to create suc-tion and discharge strokes. Wilden offers Wil-Flo, Pro-Flo, Turbo-Flo, and Accu-Flo air distribution sys-tems for your specific pumping needs. Turn to the AirDistribution Systems section on page 6 for more details.

    3. Outer Diaphragm Piston: The outer diaphragm pistonsprovide a means to connect the diaphragms to the reci-procating common shaft and to seal the liquid side fromthe air side of the diaphragm.

    4. Inner Diaphragm Piston: The inner piston is located onthe air side of the pump and does not come into contactwith the process fluid.

    5. Check Valve Ball: Wilden air-operated pumps usesuction and discharge check valves to produce direc-tional flow of process fluid in the liquid chamber. Thecheck valve balls seal and release on the check valveseats allowing for discharge and suction of process fluidto occur.

    6. Check Valve Seat: The removable seats provide theball valves a site to check.

    7. Discharge Manifold: Process fluid exits the pump fromthe discharge port located on the discharge manifold atthe top of the pump.

    8. Liquid Chamber: The liquid chamber is filled with theprocess fluid during the suction stroke and is emptiedduring the discharge stroke. It is separated from thecompressed air by the diaphragms.

    9. Diaphragm: The diaphragm membrane provides forseparation of the process fluid and the compressed airpower source. To perform adequately, diaphragmsshould be of sufficient thickness and of appropriatematerial to prevent degradation or permeation in specif-ic process fluid applications. Wilden offers a variety ofdiaphragm materials for your specific applicationrequirements. Turn to the elastomers section on page10 and 11 for more details.

    10. Inlet Manifold: Process fluid enters the pump from theintake port located on the inlet manifold at the bottom ofthe pump.

    1AIR

    CHAMBER(Qty. 2)

    2AIR

    DISTRIBUTIONSYSTEM

    7DISCHARGEMANIFOLD

    (Qty. 1)

    8LIQUID

    CHAMBER(Qty. 2)

    9DIAPHRAGM

    (Qty. 2)

    10INLET

    MANIFOLD(Qty. 1)

    6CHECK

    VALVE SEAT(Qty. 4)

    5CHECK

    VALVE BALL(Qty. 4)

    4INNER

    DIAPHRAGMPISTON(Qty. 2)

    3OUTER

    DIAPHRAGMPISTION(Qty. 2)

  • PUMP USERS GUIDE 2 WILDEN PUMP & ENGINEERING CO.

    INLET

    DISCHARGE

    B A

    Figure 1 Right Stroke

    INLET

    DISCHARGE

    B A

    Figure 2 Midstroke

    INLET

    DISCHARGE

    B A

    Figure 3 Left Stroke

    FIGURES 2 & 3 When the pressurized diaphragm (diaphragm A) reaches thelimit of its discharge stroke, the air valve redirects the compressed air supply to theback side of diaphragm B. The pressurized air forces diaphragm B away from thecenter block while the shaft pulls diaphragm A toward the center block. The airchamber on side A exhausts its air to atmosphere through the exhaust port of thepump. Diaphragm B is now on its discharge stroke while diaphragm A is on its suc-tion stroke. Diaphragm B forces the inlet valve ball (lower left) onto its seat due tothe hydraulic forces developed in the liquid chamber and manifold of the pump.These same hydraulic forces lift the discharge valve ball off its seat, while the oppo-site discharge valve ball is forced onto its seat, forcing fluid to flow through the leftside of the pump and out the discharge manifold. The movement of diaphragm A tothe center block of the pump creates a vacuum within liquid chamber A.Atmospheric pressure forces fluid into the inlet manifold of the pump. The inletvalve ball (lower right) is forced off its seat allowing the fluid to enter the right liquidchamber.

    As the pump reaches its original starting point, each diaphragm has gone throughone suction and one discharge stroke. This movement constitutes one pumpingcycle. The pump will take several cycles to completely prime depending on theapplication variables.

    The Wilden air-operated pump is a reciprocating double-diaphragm, positive displacement type. The pump displacesfluid from one of its two liquid chambers upon each strokecompletion. The following drawings and paragraphs detailthe liquid flow pattern through the pump from its initialunprimed position.

    There are a few wetted parts (parts that contact the fluid)which are dynamic: The two diaphragms which are connect-

    ed by a common shaft, the two inlet valve balls, and the twodischarge valve balls. The diaphragms act as a separationmembrane between the compressed air supply and theliquid. Driving the diaphragms with com

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