VDS SERIES SMALL VARIABLE
VOLUME VANE PUMP
VDS Series
Small Variable Volume Vane Pump
0.5in
3
/rev
4.0gpm
1000psi
V-1
qHigh efficiency operation
with minimal power loss
All the performance of the original
n e w V D R s e r i e s m e c h a n i s m s
combines with precision machin-
i n g f o r a p u m p t h a t m i n i m i z e s
power loss, especially at full cut-
off.
wQuiet operation
Jo urnal be aring s w ith a p roven
record on IP pumps plus new suc-
tion and discharge port configura-
tions reduce operating noise and
deliver quiet operation with mini-
mal vibration, ev en in th e h igh-
pressure range.
eCompact and simple
design, easy operation
Compact and quiet, VDS Series
variable vane pumps are economi-
cal and easy to handle. A simple
design allows use in a wide range
of hydraulic systems.
rPrecise characteristics,
prompt response
Prompt response at both ON-OFF
and O F F-O N e n su r es i ns t ant a-
neous, stable, high-precision oper-
ation.
tSolidly built for high effi-
ciency and long life
VDS S e rie s p ump s a re b ui l t t o
last, with a design that incorpo-
rates years of NACHI experience
and know-how. Specially selected
ma te ri al s a nd skilled w or km an-
ship provide outstanding durability
along with stable, high-efficiency
operation.
¡Handling
zT h e di re c t i o n of r ot at io n f or t hi s
pump is clockwise (rightward) when
viewed from the shaft side.
xDrain piping must be direct piping up
to a point that is below the tank fluid
level, and back pressure due to pipe
r e s i s t a n c e s h o u l d n o t e x c e e d
0.03MPa.
cWhen adjusting pressure, pressure
is i nc re a se d by c lo ck w is e (r ig ht-
ward) rotation of the adjusting screw
and decreased by counterclockwise
(leftward) rotation.
vWhen a d justing t h e flow ra t e , the
flow rate is decreased by clockwise
(rightward) rotation of the adjusting
sc re w a nd i n cr ea s ed b y c ou n te r-
clock w i se (lef t w ard) rot a tion. Th e
graph on the right provides general
g u i d e l i n e s f o r t h e r e l a t i o n s h i p
between t he rotation a ngle of the
flow rate adjusting screw and the no-
load discharge rate.
bF ac t o r y D ef a u l t P -Q S e t t i ng s
(Standard Model)
•
Flow Rate Setting = Maximum flow
rate for model as indicated in the
catalog
•
Pressure Setting = Pressure shown
in table below
However:Q=q × n × 10
−3
Q : No-load Discharge Rate (r/min)
q : Capacity (cm
3
/rev)
N : Revolution Speed min
−1
Th e v al ue s i nd i ca te d a bo ve ar e a t
m ax i m um p u m p d i s c h a r g e v o lu m e
with the flow volume adjusting screw
at the 0° position.
The broken line shows the flow volume
adjustment range lower limit value.
nThrust Screw
The thrust screw is precision adjust-
ed at the factory during assembly.
Never touch the thrust screw.
See callout 9 in the cross-section
diagram on page V-4.
mInitial Operation
Before operating the pump for the
first time, put the pump discharge
side into the no-load state and then
repeatedly start and stop the motor
to bleed all air from inside the pump
and the suction piping. After confirm-
ing that the pump is discharging oil,
continue the no-load operation for at
least 10 minutes to discharge all the
air from the circuit.
,For the hydraulic operating fluid, use
an R&O type and wear-resistant type
of ISO VG32 to 68 or equivalent (vis-
co si ty in de x o f at le as t 9 0) . U se
hydraulic operating fluid tha t pro-
v id e s k i n e m a ti c v i s c os i ty d u ri n g
o pe r a ti o n in t he r an g e of 2 0 t o
150mm
2
/s.
.The operating temperature range is
15 to 60°C. When the oil temperature
at startup is 15°C or less, perform a
warm-up operation at low pressure
un t il th e oi l t e mpe rat ure rea che s
15°C. Use the pump in an area where
the temperature is within the range
of 0 to 60°C.
(Continued on following page)
Features
Specifications
0.61
0.48
0.36
0.24
0.18
0.12
3
Pump capacity q in /rev
Factory Default
Pressure Settings
MPa{psi}
1 : 2.0 {286}
2 : 3.5 {500}
3 : 7.0 {1000}
Model
Delivery
(r/min (gpm) at No-Load)
Pressure
Adjust Range
kgf/cm
2
(psi)
Drive Speed (rpm)
Max. Setting
Pressure
kgf/cm
2
(psi)
Weight
kgf (rbs)
Foot Mounting Flange Mounting 1800rpm 1500rpm Minimum Maximum
VDS-OA-1A1-E11 VDS-OB-1A1-E11
15
(4.0)
12.5
(3.3)
10
~
20
(143
~
286)
800 1800
20
(286)
A-type 6.5
(14.3)
B-type 4.5
(9.9)
VDS-OA-1A2-E11 VDS-OB-1A2-E11
15
~
35
(214
~
500)
35
(500)
VDS-OA-1A3-E11 VDS-OB-1A3-E11
30
~
70
(429
~
1000)
70
(1000)
⁄0Suc tio n pr e ss u re i s -0 . 03 t o
+0.03MPa (-4.3 to +4.3psi), and
the suction port flow rate should
to be no greater than 2m/sec.
⁄1Avoid p ulley , ge ar, and other
drive systems that impart a radi-
al or thrust load on the end of
the pump shaft.
M oun t t he p u mp s o i t s pum p
shaft is oriented horizontally.
⁄2Provide a suction strainer with a
filtering grade of about 100 µm
(150 mesh). For the return line to
the tank, use a 25 µm line filter.
⁄3M a n a g e h y d r a u l i c o p e r a t i n g
fluid so contamination is main-
tained at class NAS10 or lower.
Take care to avoid contamina-
tion with water or other foreign
ma t te r, and wa tch f o r d is col-
oration. Whitish fluid indicates
that a ir has co ntam inat ed the
fluid , and brow nish flui d in di-
cates the fluid is dirty.
⁄4Contact your agent about using
w a t e r - an d g l y c o l - b a s e d
hydraulic operating fluids.
⁄5At st artu p, repeat th e i nching
operation (start-stop) to bleed air
from the pump and pipes.
⁄6Equip an air bleed valve in cir-
cuits where it is difficult to bleed
air before startup.
⁄7To ensure proper lubrication of
th e p um p' s rubbin g s ur fa ce s,
supply oil to the interior of the
pump before starting operation.
⁄8When centering the pump shaft,
eccentricity with the motor shaft
s h o u l d b e n o g r e a t e r t h a n
0.05mm.
Th e an gle error s hould b e no
greater than 1°.
V-2
OUT
DR
PCD 106.4
(4.17)
1/2" SAE IN3/8" SAE OUT
1/4" SAE DR
Flow rate adjusting screw
Pressure adjusting screw
4 to 11
(0.43)
25
(0.98)
17.5
(0.69)
25(0.98)
33(1.30)
MAX 199.8(7.87)
135(5.31)
50.8(2.00)
47(1.85)
96(3.78)
14.5
(0.57)
118.5(4.67)
13(0.51)
59.5(2.34)
99.5(3.92)
26
(1.02)
100(3.94)
61(2.40)
2-36.5
(1.44)
127(5.00)
152.5(6.00)
17.73
0
–0.25
3.97
+0.03
0
65(2.56)
84(3.31)
φ
φ
15.875
(
)
φ
0
–0.025
0.625
0.624
69.8
±0.1
(2.752)
(2.744)
Understanding Model Numbers
Installation Dimension Drawings
VDS-0A-1A-*-E11
Foot Mounting Type mm (inch)
Note) Foot Mounting Kit: IHM-2-10
Design number
Pressure adjustment range
1: 1 to 2MPa {146 to 292psi} 2: 1.5 to 3.5MPa {218 to 500psi}
3: 3 to 7MPa {437 to 1000psi}
Mounting method
A: Foot type mounting B: Flange type mounting
Ring size 1: 4.0gpm (1800 min no load)
Pump size: 0
–1
Pump Type: VDS Series Compact Variable Vane Pump
– – –
VDS O
1 A E11
V-3
Performance Curves
VDS-0B-1A-*-E11
Flange Mounting
Typical characteristics at hydraulic operating fluid kinematic
viscosity of 32 mm
2
/ s
Discharge pressure P MPa{kgf/cm }
Discharge pressure P MPa{kgf/cm }
0 1 2 3 4 5 6 7
{10.2} {20.4} {30.6} {40.8} {51.0} {61.2} {71.4}
0
0 2 3 4 5 6 7
{20.4}
1
{10.2} {30.6} {40.8} {51.0} {61.2} {71.4}
0.5
1.0
1.5
5
10
15
1A1
1800min
1800min
–1
1800min
–1
1500min
–1
1500min
–1
–1
1800min
–1
1500min
–1
1500min
–1
1A2
1A3
0.2
0
0.6
0.4
1.0
0.8
Q
2
Discharge pressure P MPa{kgf/cm }
0 2 3 4 5 6 7
{20.4}
1
{10.2} {30.6} {40.8} {51.0} {61.2} {71.4}
50
60
70
80
Measurement Position: 1 meter behind pump
2
2
Discharge rate Q /min
Input Lin (kW)
Power loss kW
Noise level dB(A)
1/4" SAE
DR
1/2" SAE
IN
3/8" SAE
OUT
(IN-OUT port dimension)
Width
across flats
DR
OUT
Pressure adjusting screw
Flow rate adjusting screw
82.55
0
0
–0.05
MAX 58
10
4
125
106
5.5
2-
11
100
26
61
17.73
0
–0.25
3.97
+0.03
0
25
15.875
–0.025
33
65
MAX 130
42
20
3282
118.5
φ
φ
V-4
Cross-sectional Drawing
VDS-0B-1A*-E11
Part No.
Part Name
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Key
Nut
O-ring
O-ring
O-ring
O-ring
O-ring
Screw
Bearing
Screw
Screw
Oil seal
Snap ring
Pin
Nameplate
Part No.
Part Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Body
Cover (A)
Cover (B)
Shaft
Cam ring
Vane
Plate (S)
Plate (H)
Thrust screw
Screw
Piston
Holder
Spring
Nut
Cap
List of Sealing Parts
Seal Kit: VBAS-200B00
Applicable Pump Model: VDS-0A/B-1A
*
-E11
Note)
1.Oil seals are manufactured by Nippon Oil Seal
Industry Co. Ltd. (NOK).
2.O-ring 1A/B-** refers to JIS B2401-1A.
Part No.
Part Name Part Number Q'ty
18 O-ring AS568-032 1
19 O-ring AS568-023 1
20 O-ring S71 (NOK) 1
21 O-ring 1A-P20 1
22 O-ring 1A-P10 2
27 Oil seal TCN-17358 1
