01P Piston(P01-14) E - NACHI

1 PumpsPhotoTypeSeriesDescriptionMain SpecificationsPistonPumpsPVSV ariable Volume - , 3000psiPistonPumpsPZSV ariable Volume - , - , 3642psiVanePumpsVDRV ariable Volume , , 1000psiVanePumpsVDCHigh-Pressure TypeVariable Volume - , 2000psiVanePumpsVDSS mall Variable VolumeVane , , 1000psiUni-PumpsUVNV ariable Volume , 1160psiPVS SERIESVARIABLE VOLUME piston PUMP0M**DischargeportSuctionportDrainpor tPVS Series VariableVolume piston to Design No. 30 is applied on PVS-0B to make the pump more compact and lighter, and reduce noise. Production of PVS-3B has been discontinued.

2 Use PZS-3B. Pressure adjustment 3 type has been added to PVS-1B-22 and PVS-2B-45. (Design No. 20 is applied only onPVS-2B-45*3.)P-1 Pressure rate control response is fast. The construction is simple, which improves reliability and eliminates balance of the shoe and the swash plate in the lateral direction is accomplished by discharged fluid directed to the cavity of the shoe--- For a completely hydraulically balanced assembly. The smooth operation achieved contributes to the features of high efficiency, low noise and extended fast response mechanismPressure balanced shoe in the lateral direction optimally utilizes the discharged fluidSharp cut-off characteristics obtained with simple adjusting mechanismThe special shaped fluid flow port and minute grooves have been developed to reduce noise and thus makes the operating sound NACHI flow adjusting mechanism,operating with the action of the semi-cylindrical swash plate.

3 Allows very sharp cut-off operation is easily made with a spanner shaped fluid flowport reduces noiseThe swash plate a semi-cylindrical design concept is an advancement to the conventional type. In addition to the innovative form, the swash plate adopts special bearings to control sideway motion. Consequently, power is received directly regardless of changes in the load. Stable operations can be stable swash plate enhances various operational propertiesFeaturesEnergy-saving Type withDrastically Reduced LossA NACHI -proprietary semi-circular bar-rel swash plate that receives pressureon its surface ensures a stable dis-charge volume at all times.

4 This elimi-nates excess discharge volume, andenables the effective use of power cor-responding to the load cycle. This "energy-saving type" conservesenergy, reduces power loss, and helpsto reduce hydraulic Type That DemonstratesIts Power QuietlyProprietary low-noise mechanisms areincorporated on the shoe, swash plate,valve plate, and other locations toensure silent operation. In particular, asemi-circular barrel swash plate stabi-lizes operation characteristics to ensuresilent operation. 01P_Piston(P01-14) 4:16 PM Page 1 Handling Cautions during Pump Installationand PipingzUse flexible couplings for connecting thepump shaft to the drive shaft, and pre-vent a radial or thrust load from beingapplied on the pump shaft.

5 XFor centering of the pump shaft, limit theeccentricity between the drive shaft andhydraulic pump shaft to mm, andkeep the angle error within 1 .cSet the clamping length of couplings andhy-draulic pump shafts so that it is withinat least 2/3 or more of the coupling width. vUse a sufficiently rigid pump the pressure on the pump suctionside to MPa or more (suction portflow velocity within 2 m/sec).nRaise part of the drain piping to abovethe topmost part of the pump body, andinsert the return section of the drain pip-ing into the hydraulic operating , observe the values in the followingtable to limit the drain back pressure MPa.

6 Management of Hydraulic OperatingFluidzUse good-quality hydraulic operatingfluid, and use within a kinematic viscosi-ty range of 20 to 200 mm2/sec duringoperation. Use an R&O type and wear-resistant type of IS-OGV32 to 68 orequivalent. The optimum kinematic viscosity duringoperation is 20 to 50 mm2/sec. xThe operating temperature range is 5 to60 C. When the oil temperature at start-up is 5 C or less, warm up the hydraulicpump by low-pressure, low-operationspeed operation until the oil temperaturereaches 5 C. cProvide a suction strainer with a filteringgrade of about 100 m (150 mesh).

7 Besure to provide a return line filter ofgrade 20 m or less on the return line tothe tank. (When the hydraulic pump isused at a high pressure of 14 MPa ormore, we recommend providing a filterof 10 m or the hydraulic operating fluid sothat contamination is maintained at classNAS10 or hydraulic operating fluid within anoperating ambient temperature of 0 to60 C. Cautions at StartupzBefore you start pump operation, fill thepump body with clean hydraulic operatingfluid via the lubrication port. xAn unload is required when the motor isstarted under condition.)

8 Consult youragent regarding the sure that the pump operates in thedirection of rotation the same as that indi-cated by the arrow on the pump entering the pump or pipes maycause noise or vibration. At startup, setthe pump discharge side to a noloadstate, and operate the pump in the inch-ing mode to release any air in the pumpor an air bleed valve in circuitswhere it is difficult to release air at start-up. How to Set Pressure and DischargeVolumeThe default pump discharge volume isset to "maximum" and default dischargepressure is set to "minimum".

9 Changethe discharge volume and dischargepressure settings according to your par-ticular operating joint size3/8"or more1/2"or morePipe mm dia ormore 12 mmdia or morePipe length1m or less1m or lessModel (in3/rev)Discharge volume at no-load r/min (gpm)Pressure adjustment range MPa(PSI)AllowablepeakpressureMPa(PSI)Rev olutionspeed * ( ) ( ) ( ) ( ) ( )2~ (286 ~ 500)2~ (286 ~ 1000)3~14.(429 ~ 2000)3~21.(429 ~ 3000)25(3643) *0-(*) ( ) ( ) ( ) ( ) ( )2~ (286 ~ 500)2~ (286 ~ 1000)3~14.(429 ~ 2000)3~21.(429 ~ 3000)25(3643) *0--(*) ( ) ( ) ( ) ( ) ( )2~ (286 ~ 500)2~ (286 ~ 1000)3~14.

10 (429 ~ 2000)3~21.(429 ~ 3000)25(3643) *0--(*) ( ) ( ) ( ) ( ) ( )2~ (286 ~ 500)2~ (286 ~ 1000)3~14.(429 ~ 2000)3~21.(429 ~ 3000)25(3643) *0--(*)-E13123--(*) ( ) ( ) ( ) ( ) ( )2~ (286 ~ 500)2~ (286 ~ 1000)3~14.(429 ~ 2000)3~21.(429 ~ 3000)25(3643) ) standard direction of rotation is clockwise when viewed from the shaft end. Consult your agent separately for a counterclockwise direction of A keyed straight shaft is standard. For details on spline shafts, consult your agent amount cm3 PVS-0B-8220 PVS-1B-16, 22300 PVS-2B-35, 45650[Pressure adjustment]Turning the pres-sure adjustingscrew CW increas-es the pressure.