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Positive Displacement Pump  - Operation 

LN-9415-01 

10 

OPERATION 

If the inlet pressure of the pump is too low, 
the  pump  will  be  starved  for  material  and 
will  cavitate,  resulting  in  lower  flows  than 
expected.    Additionally,  if  the  outbound 
pressure is significantly higher than the inlet 
pressure, the gears will slip by the material, 
also  causing  the  flow  to  be  less  than  ex-
pected. 
 
On  the  other  hand,  if  the  inlet  pressure  is 
too  high  (especially  at  low  viscosities), 
material  can  “blow  by”  the  gears  in  the 
meter  and  the  resultant  flow  will  be  higher 
than expected. 
 
Positive displacement gear pumps are most 
accurate  when  the  pressure  across  the 
pump  (known  as  differential  pressure)  is 
minimized.  That is, if the inlet pressure can 
be  maintained  at  a  pressure  that  is  very 
close  to  the  outlet  pressure,  the  most 
accuracy  will  be  realized.    The  RCS  and 
RCS-2  Systems  have  the  ability  to  control 
the  inlet  pressure  automatically  based  on 
the  value  of  the  outlet  pressure.    This, 
however,  is  an  optional  feature.    If  you  are 
interested  in  enabling  this  feature  on  your 
RCS  or  RCS-2  System,  contact  your 
Ransburg representative. 

PRINCIPLE OF OPERATION 

 
The  external  gear  pump  is  a  positive  dis-
placement  (PD)  type  of  pump  generally 
used  for  the  transfer  and  metering  of  liq-
uids. The gear pump is a precision machine 
with extremely tight fits and tolerances, and 
is capable of working under high differential 
pressures. 
 
Typically  there  is  a    drive  gear  driven  by  a 
motor  that  rotates  an  idler  gear  in  the 
opposite  direction.  When  the  gears  rotate, 
the liquid, which is trapped in the gear teeth 
spaces  between  the  housing  bore  and  the 
outside of the gears, is transferred from the 
inlet side of the pump to the outlet side. The 
pumped liquid moves around the outside of 
the  gears  and  not  between  the  gears.  The 
rotating  gears  continue  to  deliver  a  fresh 
supply of liquid from the suction (inlet) side 
of the pump to the discharge (outlet) side of 
the  pump,  with  virtually  no  pulsations.  The 
meshing of the gears on the discharge side 
of  the  pump  forces  the  liquid  out  of  the 
pump and into the discharge port. 
 
Flow  rate  through  the  pump  is  controlled 
simply  by  varying  the  RPM  of  the  motor 
driving  the  pump.    On  RCS  and  RCS-2 
Systems,  it  is  recommended  that  the  RPM 
of  the  pump  not  be  allowed  to  exceed  150 
RPM’s. 
 
The  accuracy  of  the  gear  pump  is  directly 
affected by both the viscosity of the material 
being  pumped  and  the  differential  pressure 
across the pump. 
 
If  the  material  is  too  thin  (e.g.  viscosities 
less  than  30  centipoise),  it  will  not  be 
properly  metered  by  the  pump  and  inaccu-
rate flow rates will result. 

Содержание A13619-00

Страница 1: ...Series A13619 00 0 3 cc rev A13620 00 0 6 cc rev A13621 00 1 8 cc rev A13635 00 3 0 cc rev IMPORTANT Before using this equipment carefully read all SAFETY PRECAUTIONS starting on page 1 and all instructions in this manual Keep this Service Manual for future reference Service Manual Price 50 00 U S Service Manual Price 50 00 U S Service Manual Price 50 00 U S Service Manual Price 50 00 U S ...

Страница 2: ...Positive Displacement Pump LN 9415 01 N O T E S ...

Страница 3: ...IONS 7 SPECIFICATIONS 7 8 INSTALLATION 9 GENERAL INFORMATION 9 SYSTEM STARTUP 9 OPERATION 10 PRINCIPLE OF OPERATION 10 SERVICE PARTS 11 DISASSEMBLY FLUSHABLE 11 REASSEMBLY FLUSHABLE 12 PARTS LIST FLUSHABLE PUMP 13 DISASSEMBLY NON FLUSHABLE 14 REASSEMBLY NON FLUSHABLE 15 PARTS LIST NON FLUSHABLE PUMP 16 MAINTENANCE 17 CALIBRATION 17 TROUBLESHOOTING 17 SERVICING 17 WARRANTY POLICIES 18 LIMITED APPLI...

Страница 4: ...c make such variations inevitable Compare this manual with your system instal lation drawings and appropriate Ransburg equipment manuals to reconcile such differ ences Careful study and continued use of this manual will provide a better understanding of the equipment and process resulting in more effi cient operation longer trouble free service and faster easier troubleshooting If you do not have ...

Страница 5: ...s used for general cleaning must have a flash point at minimum of 5 C 9 F greater than the ambient temperature It is the end users responsibility to insure this condition is met Spray booth ventilation must be kept at the rates required by NFPA 33 OSHA country and local codes In addition ventilation must be maintained during cleaning operations using flammable or combustible solvents Electrostatic...

Страница 6: ...s described in the corresponding section of the equipment manual Protection against inadvertent arcing that is capable of causing fire or explosion is lost if the current over load sensitivity is not properly set Frequent power supply shutdown indicates a problem in the system which requires correction Always turn the control panel power off prior to flushing cleaning or working on spray system eq...

Страница 7: ...ed Rubber soled insu lating shoes should not be worn Grounding straps on wrists or legs may be used to assure adequate ground contact Operators must not be wearing or carrying any ungrounded metal objects When using an electrostatic handgun operators must assure contact with the handle of the applica tor via conductive gloves or gloves with the palm section cut out NOTE REFER TO NFPA 33 OR SPECIFI...

Страница 8: ... must be located outside Class I or II Division 1 and 2 hazardous areas in accordance with NFPA 33 and EN 50176 Turn the power supply OFF before working on the equipment Test only in areas free of flammable or combus tible material Testing may require high voltage to be on but only as instructed Production should never be done with the safety circuits disabled Before turning the high voltage on ma...

Страница 9: ... The chemical re action caused by these solvents reacting with aluminum can be come violent and lead to an equipment explosion Aluminum is widely used in other spray application equipment such as material pumps regulators triggering valves etc Halogenated hydrocarbon solvents must never be used with aluminum equip ment during spraying flushing or cleaning Read the label or data sheet for the mater...

Страница 10: ... with a 22 337 by pass valve provides faster color changes and minimizes solvent usage WATER BASED APPLICATIONS The DLC pumps can be used in waterborne applications overall It is highly recommended that water based materials be submitted to our lab for evaluation to determine material compatibility with these pumps SPECIFICATIONS Flow Rate See Pump Table 1 Accuracy 95 Efficiency based on testing w...

Страница 11: ...B 440B 440B 440B 440B Shaft Gear Material 440B 440B 440B 440B 440B 440B 440B Hardness DLC Vickers 2500 2500 2500 2500 2500 2500 2500 Working Pressure max PSI 300 300 300 300 300 300 300 Input pressure max PSI 145 145 145 145 145 145 145 Working temp C 20 to 150 20 to 150 20 to 150 20 to 150 20 to 150 20 to 150 20 to 150 Pump Style Non Flushable Catalyst Non Flushable Catalyst Non Flushable Catalys...

Страница 12: ...w specified torque settings INSTALLATION RCS RESIN PUMP MOUNTED ILLUSTRATION MAX TORQUE FOR MOUNTING BOLTS 17 LB FT 23 N m Note TORQUE REQUIREMENTS AND TIGHTENING PROCEDURES HAVE THE SAME TORQUE SPECIFICATIONS FOR BOTH CATALYST NON FLUSHABLE AND RESIN FLUSHABLE PUMPS CAREFULLY TIGHTEN BOLTS DOWN IN AN X PATTERN AS SHOWN IN ABOVE ILLUSTRATION Both Series of Gear Pumps Require Four Bolts Two SHCS lo...

Страница 13: ... of pump generally used for the transfer and metering of liq uids The gear pump is a precision machine with extremely tight fits and tolerances and is capable of working under high differential pressures Typically there is a drive gear driven by a motor that rotates an idler gear in the opposite direction When the gears rotate the liquid which is trapped in the gear teeth spaces between the housin...

Страница 14: ...lide gear off of shaft 7 Pull seal 10 from front plate use seal puller or drive from opposite side Be careful not to damage the pump bore dur ing removal Please Note Driven shaft is fixed in the body and cannot be removed DO NOT ATTEMPT TO REMOVE THE FIXED SHAFT PUMP CLEANING PROCESS 1 All parts should be cleaned with a suitable cleaning agent CLEANING WITH ABRA SIVE MATERIALS WILL DAMAGE THE PUMP...

Страница 15: ...haft on bottom plate 4 Install middle plate 4 5 Install drive shaft and gear 6 into bot tom plate assembly 6 Install O rings 8 9 into grooves on top of plate 7 Assemble top plate 3 onto pump as sembly 8 Press alignment pins back into pump carefully 9 Reinstall bolts 1 and tighten in a star pattern Torque to 13 Lb Ft 15 Nm Note Drive shaft of pump should be man ually turned during the bolt tighteni...

Страница 16: ... KIT CHART B BELOW 7 1 KEYWAY N A 8 2 A13790 00 O RING INCLUDED IN A13790 KIT 9 2 A13790 00 O RING INCLUDED IN A13790 KIT 10 1 22 315 SEAL RADIAL INCLUDED IN A13790 KIT SEE FIGURE 1 4 EXPLODED PUMP VIEW FLUSHABLE PUMP KIT GEARS SPACER PLATE PUMP KIT DESCRPTION USED ON PUMP SIZE CC S A13792 05 KIT GEARS SPACER PLATE 3 5 CC DLC PUMP A13622 00 3 5 A13792 06 KIT GEARS SPACER PLATE 6 0 CC DLC PUMP A136...

Страница 17: ...e it will only slide out in one direction 5 Remove the center plate 9 carefully 6 Slide drive gear off of shaft 7 Pull seal 15 from front plate use seal puller or drive from opposite side Be careful not to damage the pump bore dur ing removal Please Note Driven shaft 4 is fixed in the body and cannot be removed DO NOT AT TEMPT TO REMOVE THE FIXED SHAFT PUMP CLEANING PROCESS 1 All parts should be c...

Страница 18: ...Install circlip on drive shaft closest to front plate 5 Install key 7 Slide on drive gear 5 and install second circlip 6 Install a new O ring 10 on bottom plate and top plate in appropriate O ring grooves 7 Place driven gear back onto fixed shaft on bottom plate 8 Install middle plate 9 9 Assemble top plate 14 onto pump 10 Press alignment pins back into pump carefully 11 Reinstall bolts 1 Tighten ...

Страница 19: ...X PLATE CENTER SEE KIT CHART A BELOW 10 2 A13791 00 O RING INCLUDED IN A13791 KIT 11 12 13 14 PLATE TOP N A 15 1 22 383 SEAL RADIAL INCLUDED IN A13791 KIT SEE FIGURE 1 2 EXPLODED PUMP VIEW NON FLUSHABLE PUMP KIT GEARS SPACER PLATE PUMP KIT DESCRPTION USED ON PUMP SIZE CC S A13792 01 KIT GEARS SPACER PLATE 0 3 CC DLC PUMP A13619 00 0 3 A13792 02 KIT GEARS SPACER PLATE 0 6 CC DLC PUMP A13620 00 0 6 ...

Страница 20: ... gear binding Maintain the fluid filters according to the instructions from the filter manufacturer If repeated disassembly and cleaning for removal of solids and particu lates occurs inspect the entire fluid supply system and evaluate the system cleaning cycle SERVICING Depressurize the gear pumps before attempt ing to remove from manifold Remove the gear pump for service to a suitable clean area...

Страница 21: ...rchase WRAPPING THE APPLICATOR ASSO CIATED VALVES AND TUBING AND SUPPORTING HARDWARE IN PLASTIC SHRINK WRAP OR ANY OTHER NON APPROVED COVERING WILL VOID THIS WARRANTY RANSBURG S ONLY OBLIGATION UNDER THIS WARRANTY IS TO RE PLACE PARTS THAT HAVE FAILED BECAUSE OF FAULTY WORKMANSHIP OR MATER IALS THERE ARE NO IMPLIED WAR RANTIES NOR WARRAN TIES OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR P...

Страница 22: ...ne Street Angola Indiana 46703 9100 Telephone 260 665 8800 Fax 260 665 8516 Technical Service Assistance 320 Philips Ave Toledo Ohio 43612 1493 Telephone toll free 800 233 3366 Fax 419 470 2233 www ransburg com Form No LN 9415 01 2015 Finishing Brands Americas Litho in U S A Models and specifications subject to change without notice 01 15 ...

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