Outstanding self-priming performance even under extreme conditions
Selection chart
UHN type
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)
-colored area shows that 2P motor models are also available. Please ask
for details. -colored area shows that 200mm bore models are also available. Please ask
for details.
50Hz
60Hz
Outer dimensions
UHN type
Unit: mm
Model No.
(-Poles)
Bore
Suction/ Discharge
Pump
Bracket
No.
Motor
Base plate
A
B
D
E
F
J
Weight
(kg)
Frame
No.
Output power
(kW)
G
Weight
(kg)
Z
d
K
N
L
M
R
P
P'
n
Weight
(kg)
0400-4P
40
337
110
120
110
185
122
35
120
80
0.75
262
11
15
M12
110
350
570
250
286
50
14
3
13
-2P
40
337
110
120
110
190
152
35
120
112M
3.7
376
41
15
M12
120
390
630
280
316
55
18
3
18
0410-4P
40
340
110
140
125
185
145
41
120
90L
1.5
314
20
15
M12
110
350
570
250
286
50
14
3
13
-2P
40
340
110
140
125
205
135
41
120
132S
5.5
445
55
19
M16
150
480
780
330
370
70
25
3
28
0420-4P
40
375
115
160
150
220
125
52
130
100L
2.2
348
29
15
M12
140
450
730
300
336
60
18
3
21
-2P
40
375
115
160
150
242
165
52
130
160M
11
586
100
19
M16
180
570
930
385
425
82
25
3
45
0500-4P
50
340
115
140
125
185
145
40
120
90L
1.5
314
20
15
M12
110
350
570
250
286
50
14
3
13
-2P
50
340
115
140
125
205
135
40
120
132S
7.5
445
55
19
M16
150
480
780
330
370
70
25
3
28
0510-4P
50
375
115
160
145
220
125
51
130
100L
2.2
348
29
15
M12
140
450
730
300
336
60
18
3
21
-2P
50
375
115
160
145
242
165
51
130
160M
15
586
100
19
M16
180
570
930
385
425
82
25
3
45
0520-4P
50
375
115
170
160
220
150
54
130
112M
3.7
376
41
15
M12
140
450
730
300
336
60
18
3
21
-2P
50
375
115
170
160
242
165
54
130
160M
15
586
100
19
M16
180
570
930
385
425
82
25
3
45
0525-4P
50
375
115
170
160
230
135
54
130
132S
5.5
445
55
19
M16
150
480
780
330
370
70
25
3
28
0530-4P
50
433
120
200
185
250
160
80
140
132M
7.5
483
66
19
M16
170
540
880
350
396
70
25
3
31
0600-4P
65
345
120
150
135
185
150
45
120
90L
1.5
314
20
15
M12
110
350
570
250
286
50
14
3
13
0610-4P
65
380
120
170
155
220
155
56
130
112M
3.7
376
41
15
M12
140
450
730
300
336
60
18
3
21
0620-4P
65
433
120
180
170
250
185
74
140
132S
5.5
445
55
19
M16
150
480
780
330
370
70
25
3
28
0800-4P
80
380
125
170
150
220
155
60
130
112M
3.7
376
41
15
M12
140
450
730
300
336
60
18
3
21
-2P
80
380
125
170
150
242
195
60
130
160L
18.5
630
125
19
M16
180
570
930
385
425
82
25
3
45
0810-4P
80
438
125
180
170
250
190
72
140
132S
5.5
445
55
19
M16
150
480
780
330
370
70
25
3
28
-2P
80
438
125
180
170
272
195
72
140
180M
22
656
180
19
M16
200
630
1030
430
470
92
27
3
58
0820-4P
80
495
125
200
190
275
200
101
145
132M
7.5
483
66
19
M16
170
540
880
350
396
70
25
3
31
-2P
80
495
125
200
190
295
250
101
145
180L
30
694
215
19
M16
200
630
1030
430
470
90
27
3
58
0830-4P
80
490
135
210
210
285
225
105
145
160M
11
586
100
19
M16
180
570
930
385
425
80
25
3
45
0840-4P
80
496
135
220
220
295
231
125
145
160L
15
630
125
19
M16
200
630
1030
430
470
90
27
3
58
1000-4P
100
438
135
180
170
250
190
75
140
132S
5.5
445
55
19
M16
150
480
780
330
370
70
25
3
28
1002-2P
100
438
135
180
170
272
220
75
140
180L
30
694
215
19
M16
200
630
1030
430
470
92
27
3
58
1010-4P
100
438
135
200
185
250
165
76
140
132M
7.5
483
66
19
M16
170
540
880
350
396
70
25
3
31
*1010-2P
100
499
135
200
185
305
254
95
145
200L
45
762
290
19
M16
220
690
1130
525
571
100
30
4
89
1020-4P
100
495
135
210
200
285
230
110
145
160M
11
586
100
19
M16
180
570
930
385
425
80
25
3
45
1030-4P
100
495
135
220
210
295
230
117
145
160L
15
630
125
19
M16
200
630
1030
430
470
90
27
3
58
1040-4P
100
495
135
230
230
295
230
130
145
180M
18.5
656
180
19
M16
200
630
1030
430
470
90
27
3
58
1050-4P
100
563
180
250
245
360
60
160
155
180M
22
656
180
19
M16
270
840
1380
525
571
110
30
3
104
1200-4P
125
510
180
190
180
275
215
110
145
132M
7.5
483
66
19
M16
170
540
880
350
396
70
25
3
31
1210-4P
125
511
170
200
190
285
246
119
145
160M
11
586
100
19
M16
180
570
930
385
425
80
25
3
45
1220-4P
125
495
155
220
200
295
230
131
145
160L
15
630
125
19
M16
200
630
1030
430
470
90
27
3
58
1230-4P
125
495
145
240
225
295
230
135
145
180M
18.5
656
180
19
M16
200
630
1030
430
470
90
27
3
58
1500-4P
150
520
205
210
200
275
225
122
145
132M
7.5
483
66
19
M16
170
540
880
350
396
70
25
3
31
1510-4P
150
505
180
210
215
285
240
130
145
160M
11
586
100
19
M16
180
570
930
385
425
80
25
3
45
1520-4P
150
505
180
210
215
295
240
135
145
160L
15
630
125
19
M16
200
630
1030
430
470
90
27
3
58
1530-4P
150
564
205
265
265
360
61
220
155
180M
22
656
180
19
M16
270
840
1380
525
571
110
30
3
104
1540-4P
150
564
205
265
265
360
91
220
155
180L
30
630
215
19
M16
270
840
1380
525
571
110
30
4
104
1550-4P
150
680
200
260
275
410
210
252
165
200L
45
762
290
19
M16
270
840
1380
525
571
110
30
4
104
1571-4P
150
680
200
290
300
445
175
270
165
250S
75
842
470
23
M20
250
1100
1600
550
600
145
25
4
200
2000-4P
200
573
217
270
250
360
50
255
155
160M
11
586
100
19
M16
270
840
1380
525
571
110
30
3
104
2010-4P
200
573
217
270
250
360
70
230
155
160L
15
630
125
19
M16
270
840
1380
525
571
110
30
3
104
2020-4P
200
695
210
280
275
410
175
275
165
180M
22
656
180
19
M16
270
840
1380
525
571
110
30
3
104
2025-4P
200
695
230
320
290
450
140
290
165
250S
75
842
470
23
M20
200
1100
1500
600
650
150
25
4
190
2030-4P
200
696
225
285
295
410
225
280
165
200L
37
762
290
19
M16
270
840
1380
525
571
110
30
4
104
2040-4P
200
696
225
285
295
410
175
285
165
225S
55
807
335
23
M20
300
930
1530
525
571
110
30
4
110
2045-4P
200
819
210
360
325
500
170
380
170
250M
90
923
520
23
M20
250
1200
1700
550
600
145
25
4
240
2050-4P
200
806
215
300
305
500
157
380
170
250S
75
842
470
23
M20
250
1200
1700
550
600
145
25
4
240
2060-4P
200
801
235
325
330
500
152
430
170
250M
90
923
520
23
M20
250
1200
1700
550
600
145
25
4
240
2065-4P
200
819
235
380
350
525
220
420
170
280M
132
1071
800
25
M22
300
1200
1800
590
650
170
28
4
280
2070-4P
200
806
253
350
355
525
207
450
170
280M
132
1071
800
25
M22
300
1200
1800
590
650
170
28
4
280
2520-4P
250
695
270
300
275
410
225
320
165
200L
37
762
290
19
M16
270
840
1380
525
571
110
30
4
104
2530-4P
250
819
250
380
300
500
170
380
170
225S
55
822
335
23
M20
250
1100
1600
550
600
145
25
4
200
2540-4P
250
819
250
380
300
500
170
400
170
250M
90
923
520
23
M20
250
1200
1700
550
600
145
25
4
240
2541-4P
250
819
255
360
345
550
170
460
175
250M
110
923
520
23
M20
250
1200
1700
650
700
150
25
4
250
2560-4P
250
819
280
380
345
525
70
460
170
315S
150
1230
1200
23
M20
150
800
1900
640
700
170
28
6
330
2561-4P
250
885
290
390
390
580
50
540
175
315S
200
1230
1200
23
M20
150
850
2000
740
800
180
25
6
350
Note:
Standard accessories: Common base plate, Shaft coupling, Foundation bolts
and Safety cover.
Base plate with dimension L larger than 1600mm is made of steel plate.
(∗) For the 2P, pump type is UHNM-1010.
Outer dimensions refer only to electric motors at maximum motor output
(at 60Hz), therefore there may be differences in outer dimensions. For
details on related dimensional outline drawings, please contact us.
Flange
Unit: mm
Symbol
Flange dimensions (JIS 10K)
A (Bore)
40
50
65
80
100
125
150
200
250
D
140
155
175
185
210
250
280
330
400
C
105
120
140
150
175
210
240
290
355
n - h
4-19
4-19
4-19
8-19
8-19
8-23
8-23
12-23
12-25
Foundation bolt
Unit: mm
Bolt d
d1
S
L1
L
M12
12
32
50
250
M16
16
40
63
315
M20
20
50
80
400
M22
22
56
90
500
Unit: kW
Motor frame number and output power
(Enclosed fan-cooling type)
Pole number
Frame
number
2P
4P
6P
0.4
0.4
-
71
0.75
0.75
0.4
80
1.5
1.5
0.75
90L
2.2
-
2.2
1.5
100L
3.7
3.7
2.2
112M
5.5
5.5
3.7
132S
7.5
-
7.5
5.5
132M
11
11
7.5
160M
15
18.5
15
11
160L
Pole number
Frame
number
2P
4P
6P
22
18.5
15
180M
22
30
30
18.5
180L
22
37
37
30
200L
45
45
37
55
55
45
225S
75
75
55
250S
90
90
75
250M
110
110
90
280S
132
132
110
280M
150
150
132
315S
Bearing, Shaft seal
Bracket
number
Shaft seal
(in case of a gland packing)
Bearing
Bearing seal
(in case of an oil seal)
Lubricating
oil
Inner diameter x Outer diameter
x Width
Q'ty
Pump side
Coupling
side
Pump side
Coupling
side
Oil
amount
L
Type
120
28 x 44 x 8
4
6306
6206
TC28408
TC28408
0.28
Turbine
oil
ISO
VG46
130
32 x 51 x 9.5
4
6307
6207
TC32458
TC32458
0.35
140
38 x 60 x 11
4
6308
6307
TC38558
TC35508
0.45
145
42 x 67 x 12.5
4
6309
6308
TC42609
TC40559
0.65
155
48 x 73 x 12.5
4
6310
6309
TC48659
TC45609
0.90
165
55 x 80 x 12.5
5
6312
6311
TC55729
TC50689
1.70
170
75 x 105 x 16
5
NU316
6316
TC7510013
TC7510013
1.80
Installation and piping
To make the best use of the features of the UHN type, 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:
UHN-0520 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.
-colored area shows that 2P motor models are also available. Please ask
for details.
-colored area shows that 200mm bore models are also available. Please ask
for details.
