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Self-Priming Centrifugal Pump
         Pump

Self-Priming Centrifugal Pump
UHN series
(PAT.)

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
Self-Priming Centrifugal Pump UHN 50Hz

60Hz
Self-Priming Centrifugal Pump UHN 60Hz

Outer dimensions
UHN type

Self-Priming Centrifugal Pump

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

Centrifugal Pump / 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 x h

4-19

4-19

4-19

8-19

8-19

8-23

8-23

12-23

12-25



Foundation bolt

Centrifugal Pump / 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.

Self-Priming Centrifugal Pump / Self-priming suction operation

Limit the extension of the inverse U-bent pipe (L) within 3m.

Self-Priming Centrifugal Pump / Self-priming suction operation


Piping layout example 2.
Sealed tank (vacuum tank) extraction operation


Piping layout example 3.
Self-priming suction operation with long horizontal pipe


Self-Priming Centrifugal Pump / Sealed (vacuum) tank extraction operation
                  Operation

Attach the inverse U-bent pipe.

Self-Priming Centrifugal Pump / Self-priming suction operation with long horizontal pipe
                  horizontal pipe


Length of riser

Self-Priming Centrifugal Pump / 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
h
1>=200+(50)+(5x22)=360
Use a riser of over 360mm length, desirably over 500mm.
For slurry liquid pumping, please contact us.

Exhaust valve

Discharge pipe bore (mm)

Valve bore

40 - 80

10A

100-150

15A

200-250

20A


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