Wide lineup of back-pullout type including self-priming models
Selection chart
Self-priming UB, UBC types
Model number explanation
XXXX-##@@-xP (**)
XXXX
: Pump type
##
: Suction/Discharge bore (cm)
@@
: Head classification
xP
: Electric motor pole number (2P, 4P, 6P, other)
(**)
: Electric motor output power (kW) at maximum performance (using normal
water at normal temperature)
As for green-colored area in the selection chart, please select the model
from UHN type.
50Hz
60Hz
Outer dimensions
UB type
UBC type
Unit: mm
Model No.
(-Poles)
Bore
Suction/ Discharge
Pump
Weight
(kg)
Motor
Base plate
Foot support
Center support
A
B
D
E
n
Frame No.
G
J
Z-d
K
N
L
M
R
F
J
Z-d
K
N
L
M
R
F
0318-4P
40/32
435
100
160
130
100
50
90L
314
50
4-15
125
650
900
220
250
230
-150
4-19
125
850
1100
500
550
265
-2P
40/32
435
100
160
130
100
50
132S
447
50
4-19
125
750
1000
310
350
255
-125
4-19
150
900
1200
500
550
265
0323-4P
40/32
435
145
180
130
100
50
90L
314
50
4-15
125
650
900
220
250
270
-150
4-19
125
850
1100
500
550
305
-2P
40/32
435
145
180
130
100
50
132S
447
50
4-19
125
750
1000
310
350
295
-125
4-19
150
900
1200
500
550
305
0418-4P
50/40
435
110
150
130
100
55
90L
314
50
4-15
125
650
900
220
250
250
-150
4-19
125
850
1100
500
550
225
-2P
50/40
435
110
150
130
100
55
132S
447
50
4-19
125
750
1000
310
350
275
-125
4-19
150
900
1200
500
550
225
0423-4P
50/40
435
110
180
160
100
65
100L
352
50
4-19
125
750
1000
260
300
275
-75
4-19
200
900
1200
550
600
285
-2P
50/40
435
110
180
160
100
65
160L
619
75
4-19
150
900
1200
360
400
275
-75
4-23
200
1000
1400
540
600
310
0518-4P
80/50
435
110
160
135
100
75
100L
352
50
4-19
125
750
1000
260
300
265
-75
4-19
200
900
1200
550
600
275
-2P
80/50
435
110
160
135
100
75
160L
619
75
4-19
150
900
1200
360
400
265
-75
4-23
200
1000
1400
540
600
300
0523-4P
80/50
440
110
180
160
100
85
112M
376
50
4-19
125
850
1100
360
400
285
-125
4-19
150
1000
1300
550
600
295
-2P
80/50
440
110
180
160
100
85
200L
762
75
4-19
150
900
1200
360
400
285
-75
4-23
200
1000
1400
540
600
320
0818-2P
100/80
435
130
170
150
100
90
200L
762
60
4-19
150
1000
1300
400
450
295
-90
4-23
200
1000
1400
790
850
340
0823-4P
100/80
505
130
200
190
100
110
132M
485
60
4-19
150
900
1200
360
400
305
-90
4-23
200
1000
1400
790
850
340
-2P
100/80
505
130
200
190
100
110
200L
762
110
4-23
200
1000
1400
450
500
330
-40
4-23
250
1100
1600
790
850
340
0828-4P
100/80
505
140
220
210
100
130
160M
575
60
4-19
150
900
1200
360
400
325
-90
4-23
200
1000
1400
790
850
360
1034-4P
150/100
600
160
280
240
100
160
160L
684
65
4-23
200
1000
1400
450
500
390
-85
4-23
250
1100
1600
790
850
410
1040-4P
150/100
600
180
310
270
100
200
200L
762
65
4-23
200
1100
1500
400
450
400
-85
4-23
250
1200
1700
890
950
410
1523-4P
200/150
505
160
250
230
130
140
180M
646
110
4-23
200
1000
1400
450
500
360
-40
4-23
250
1100
1600
840
900
370
1528-4P
200/150
620
160
280
240
130
170
200L
762
65
4-23
200
1100
1500
400
450
370
-85
4-23
250
1200
1700
840
900
380
2534-6P
250/250
780
305
350
320
230
400
225S
782
40
6-23
150
800
1900
590
650
570
-170
6-23
150
900
2100
1140
1200
580
-4P
250/250
780
305
350
320
230
400
250M
916
40
6-23
150
900
2100
590
650
580
-170
6-23
200
950
2300
1140
1200
600
2540-6P
250/250
780
300
400
360
230
480
280M
1022
40
6-23
150
900
2100
590
650
580
-150
6-23
200
950
2300
1140
1200
600
-4P
250/250
780
300
400
360
230
480
315S
1445
10
6-23
200
900
2200
690
750
580
-150
6-23
200
1000
2400
1140
1200
600
2546-6P
250/250
850
250
380
350
180
600
315S
1445
40
6-23
200
900
2200
690
750
560
-110
6-23
200
1000
2400
1140
1200
580
-4P
250/250
850
250
380
350
180
600
400L
1580
20
6-23
200
1000
2400
740
800
610
-60
6-25
250
1050
2600
1130
1200
630
3034-4P
300/300
795
335
400
370
300
590
250M
967
70
6-23
150
900
2100
690
750
620
-
-
-
-
-
-
-
-
3040-4P
300/300
865
295
420
395
300
700
280M
1166
10
6-23
200
950
2300
840
900
670
-
-
-
-
-
-
-
-
3540-4P
350/350
918
390
430
420
300
860
280M
1166
40
6-23
200
1000
2400
840
900
670
-
-
-
-
-
-
-
-
Note:
Flanges are manufactured according to requested specifications such as
JIS 10K, JIS 20K, API, ANSI 150LB, ANSI 300LB.
Numbers with negatives in column J in this table indicate the dimensions
on the left side of the center line of the casing.
Dimensions in this table are subject to change. For details on related
dimensional outline drawings, please contact us.
Installation and piping
To make the best use of the features of the UB, UBC types, please follow
the items below.
1.
The pump sucks water in the axial direction. Be sure to install an inverse
U-bent pipe in the suction piping as shown in the figure below.
2.
The pump, being a self-priming type, does not require installation of a
foot valve or an intermediate valve in ordinary operating conditions. However,
if frequent operation or shorter self-priming time is desired, we recommend
installing such valves. The purpose is to keep as much water as possible
in the pump. The valve need not function perfectly and minor leakage will
not affect performance.
3.
If a gland packing is used for shaft sealing, we recommend installation
of an external flusher to prevent air from being sucked during self-priming
and to maintain efficiency of the gland packing.
4.
When the pump is started up, the water inside the casing is discharged
once into the discharge side before returning to the casing, and then stabilizes
after recirculation begins. If the discharged water floods the check valve
and the bent pipe, the amount of recirculating water becomes insufficient
and self-priming efficiency decreases. Therefore, be sure to install a
riser of the height shown in the figure below. For situations where the
riser is too long for installation, we can provide a short discharge pipe
(h2) which is made of the same material as the casing and has a special construction.
Please contact us for more details.
5.
Be sure to install a check valve on the discharge side of the pump. We
recommend the YOKOTA Non-Water Hammer Check Valve to prevent water hammer
due to reverse flow when pump operation is stopped. Particularly with parallel
operation, when one pump is stopped, it will be subject to back pressure
from the other pump, causing water hammer. The YOKOTA Non-Water Hammer
Check Valve can prevent water hammer even in such a situation. Further,
attachment of the YOKOTA No-Feed Detector (Optional) can prevent the pump
from dry operation.
6.
If the pumps are under parallel operation or if the actual pump head above
the check valve exceeds more than 1/3 of the shut off head, back pressure
acts on the check valve, making it difficult to exhaust air. Install an
exhaust valve to relieve such a situation. In this case, install a suitable
socket (refer to the table below) on the riser at the highest possible
position (refer to "J" in the figure below), and then install
the exhaust valve so that the opening end of its suction part is in the
center of the riser bore.
There may be water leakage from the exhaust valve. To prevent air from
being sucked when operation is stopped, install a pipe from the exhaust
valve to a point below the water level of the suction side.
For slurry liquid pumping, please contact us.
Piping layout example 1.
Self-priming suction operation
Attach the inverse U-bent pipe to the pump.
Limit the extension of the inverse U-bent pipe (L) within 3m.
Piping layout example 2.
Sealed tank (vacuum tank) extraction operation
Piping layout example 3.
Self-priming suction operation with long horizontal pipe
Attach the inverse U-bent pipe.
Length of riser
Length of riser
h1 >= 200 + d + 5H (Total head of pump <= 50m)
h1 >= 300 + d + 5H (Total head of pump > 50m)
Where
h1:
Length of riser (mm)
d:
Discharge bore (mm)
H:
Total head of pump (m)
Example:
UBO-0523 80mm/50mm x 0.3m3/min x 22m x 1750min-1 x 3.7kW
h1>=200+(50)+(5x22)=360
Use a riser of over 360mm length, desirably over 500mm.
For slurry liquid pumping, please contact us.
