Series PAVC Variable Volume Piston Pumps - phtruck.com

1 1 Series PAVCV ariable DisplacementPiston Pumps zp01 Catalog HY28-2662-CD/US2 Parker Hannifin CorporationHydraulic Pump DivisionMarysville, Ohio USAV ariable Displacement Piston PumpsCatalog HY28-2662-CD/USIntroductionSeries PAVCQ uick Reference Data ChartDisplacementPump Delivery*Approx. Noise Levels dB(A)Input Power AtOperatingPressurePumpCM3/REV@ 21 bar (300 PSI)@ Full Flow 1800 RPM (1200 RPM)1800 RPM, MaximumSpeed RPM bar (PSI)Model(IN3/REV)in LPM (GPM)34 bar69 bar138 bar207 barDisplacement &(Maximum)Continuous1200 RPM1800 RPM(500 PSI) (1000 PSI) (2000 PSI) (3000 PSI)207 bar (3000 PSI)(Maximum)PAVC3333 ( ) ( ) ( ) 75 (69)76 (72)78 (75)79 (77) kw ( hp)3000 207 (3000)PAVC3838 ( ) ( ) ( ) 75 (69)76 (72)78 (75)79 (77) kw ( hp)3000207 (3000)PAVC6565 ( ) ( ) ( ) 77 (75)78 (76)80 (78)81 (79) kw ( hp)3000207 (3000)

2 PAVC100100 ( ) ( ) ( ) 83 (77)82 (78)82 (79)85 (80) kw ( hp)2600207 (3000)* Since many variables such as mounting, tank style, plant layout, etc., effect noise levels, it cannot be assumed that the above readings will be equalto those in the field. The above values are for guidance in selecting the proper pump. Noise levels are A-weighted, mean sound pressure levels at1 meter from the pump, measured and recorded in accordance with applicable ISO and NFPA Hannifin CorporationHydraulic Pump DivisionMarysville, Ohio USAV ariable Displacement Piston PumpsCatalog HY28-2662-CD/USREARCOVERHYDRODYNAMICBEAR INGREPLACEABLEPORT PLATEPUMPHOUSINGSEALEDBEARINGSHAFTSEALSE RVOPISTONCYLINDERBARRELI ntroductionSeries PAVCF eatures High Strength Cast-Iron Housing Built-In Supercharger Ensures High Speed Capability- 3000 RPM (2600 RPM PAVC100)

3 Sealed Shaft Bearing Two Piece Design for Ease of Service Cartridge Type Controls - Field Changeable Replaceable Bronze Clad Port Plate Airbleed Standard for Quick Priming Hydrodynamic Cylinder Barrel Bearing Thru-Shaft (PAVC100 Only) Full Pressure Rating on Most Water Glycol Fluids Pump Case and Shaft Seal are Subjectedto Inlet Pressure Only Filter and/or Cool Drain Line7 bar (100 PSI) MaximumControls Pressure Compensation Load Sensing Power (Torque) Limiting Power and Load Sensing Remote Pressure Compensation Adjustable Maximum Volume Stop Electrohydraulic Flow and Pressure Low Pressure Standby4 Parker Hannifin CorporationHydraulic Pump DivisionMarysville, Ohio USAV ariable Displacement Piston PumpsCatalog HY28-2662-CD/USOUTPUTINPUTOIL FLOWDRIVESHAFTSWASHPLATEROTATINGPISTONBA RRELSUMMATION OFPISTON FORCESSERVO PISTONPUMPINGPISTONI ntroductionSeries pavc 33/38/65/100 General DescriptionAll control is achieved by the proper positioning of theswash plate.

4 This is achieved by a servo Piston acting onone end of the swash plate working against the combinedeffect of the off-setting forces of the pistons and centeringspring on the other end. The control spool acts as ametering valve which varies the pressure behind theservo shown in Figure 1, the amount of flow produced bythe Parker Piston Pump is dependent upon the length ofstroke of the pumping pistons. This length of stroke, inturn, is determined by the position of the swash flow is achieved at an angle of 17 .The rotating Piston barrel, driven by the prime mover,moves the pistons in a circular path and the pistonslippers are supported hydrostatically against the face ofthe swash plate.

5 When the swash plate is in a verticalposition, perpendicular to the centerline of the pistonbarrel, there is no Piston stroke and consequently nofluid displacement. When the swash plate is positionedat an angle, the pistons are forced in and out of the barreland fluid displacement takes place. The greater the angleof the swash plate, the greater the Piston centerline of the pumping Piston assembly is offsetfrom the centerline of the swash plate. Therefore, asshown on the accompanying Figure 1A, the pistons effective summation force tends to destroke the swashplate to a vertical (neutral) position.

6 This destroking forceis balanced as the swash plate is angled by the force ofthe servo 1. Pumping ActionFIGURE Hannifin CorporationHydraulic Pump DivisionMarysville, Ohio USAV ariable Displacement Piston PumpsCatalog HY28-2662-CD/USINLETPISTONPISTONBARRELSE RVO PISTONAIRBLEED VALVEASSEMBLYCONTROLSPOOL ANDSLEEVECONTROL SPOOLSPRING CHAMBERDIFFERENTIALADJUSTMENTPRESSURECOM PENSATORADJUSTMENTCONTROL DRAINPORT A SWASHPLATEFOUTLETECONTROL OPTION - OMIT DControl OptionsSeries pavc 33/38/65/100 Pressure Compensated ControlSwash plate angle controls the output flow of the plate angle is controlled by the force generatedagainst the swash plate by the pumping pistons and bythe force of the servo Piston .

7 The force of the servopiston is greater than the force of the pumping pistonswhen both are at the same means of internal porting, pressure is connected fromthe output port to the servo Piston via orifice (E), and tothe control spool via passage (D). Also pressure isapplied to the control spool chamber thru orifice (F). Aslong as the pressures at both ends of the control spoolremain equal, the spool will remain offset upward, due tothe added force of the pressure reaches the setting of the compensatorcontrol, the dart leaves its seat causing the pressure inthe spool chamber to be reduced.

8 The spool now movesdownward causing pressure in the servo Piston cavity tovent via port A . The reduced pressure at the servopiston allows the servo Piston to move to the right. Thismovement reduces the angle of the swash plate andthereby reduces the Pumps output pump pressure on the control spool drops belowpressure and spring force in the spool chamber,the control spool moves upward to maintain an equilibriumon both sides of the spool. If pump pressure falls belowcompensator control setting, the control spool movesup, bringing the pump to maximum Adjustment of pavc PumpsPROCEDURE:a.

9 Standard Pressure Compensated PumpPumps are shipped from factory with a differentialpressure of approximately 150 PSI (10 bar) on PAVC33/38/65, pavc 100 is 300 PSI (21 bar) at 50% ofmaximum swash angle. Differential pressure willnot normally change through the life of the pump. Ifthis control has been tampered with, a closeapproximation of the correct setting can be made asfollows:Dead head the pump (no flow) with a 0-207 bar (0-3000 PSI) gauge in the OUTLET (not the low signal B port), back the pressure compensator adjustmentout (full counterclockwise).

10 The gauge should read between 22-26 bar (325-375 PSI) pavc 33, 38 & 65, 34-40 bar (500-575 PSI) pavc 100. If the gauge reads differentthan this, turn the differential adjustment knob(Differential Option 4) or add/remove shims (OmitOption) until correct pressure figure is (AT CONSTANT SPEED)6 Parker Hannifin CorporationHydraulic Pump DivisionMarysville, Ohio USAV ariable Displacement Piston PumpsCatalog HY28-2662-CD/USINLETPISTONPISTONBARRELSE RVO PISTONAIRBLEED VALVEASSEMBLYCONTROLSPOOL ANDSLEEVECONTROL SPOOLSPRING CHAMBERDIFFERENTIALADJUSTMENTPRESSURECOM PENSATORADJUSTMENTCONTROL DRAINPORT A SWASHPLATEFOUTLETPORT B ECONTROL OPTION - M DRemote Pressure ControlControl Type (M)Remote control of the pavc output pressure can beachieved by controlling the pressure in the low signal B port when the pump is set up for Control Type (M)