Rotary Gear Pump Type RDBX-RDNX

  • HGBX-NX
  • HGBX-NX
  • HGBX-NX
  • HGBX-NX

Description

Handling high volume of viscous liquid at medium pressure is a challenge & calls for expertise. We at DEL have aquired this over last 25 years through in house research & development based on customer feed back & field trials.

The proven range of rotary twin gear pump type 'RDRN' have been modified to achieve high pressure by reducing the bearing span, balancing the hydraulic force & blocking the slippage path but without compromising on the basic features prominent with all ROTODEL rotary pumps viz the compactness, efficiency, reliability & low noise level.

A pair of impeller with herringbone gear fitted on hardened & ground shaft with shaft sleeves in floating design supported on either side on needle/bush bearings located on end covers with ltb. wearing plate packed in between and placed inside close tolerance accurately machined casing with built in pressure relief valve makes the pump. Size 1/2" to 2 1/2" are provided with BSP thread inlet - oulet flange connections & they are available with foot or flange mounting. Size 3" to 6" are foot mounted with inlet-outlet port drilled to ASA-300 class. Type RDBX is a bush bearing version & is offered upto 2 1/2" size.

This pump can also be offered with different MOC viz. CI,CS, Bronze, SS etc. Pump upto 35 bar are also offered in this series by further reducing the bearing span. The flange type pump coupled with flange type electric motor is offered in horizontal as well as vertical construction.

Dimension

rotary gear pump
Parts List with
Material of Construction
Sr. Item Qt Material
01 Pump Casing 1 CI/CS/SS
02 Front Cover 1 CI/CS/SS
03 Back Cover 1 CI/CS/SS
04 Gland Cover 1 CI/CS/SS
05 R.V. Body 1 CI/CS/SS
06 Rotor Shaft 1 EN 9/19/SS
07 Stator shaft 1 EN 9/19/SS
08 Impeller Gear 4 EN 24/SS
09 Needle Brg. 4 IKO/INA
10 Wear Plate 4 LTB
11 R.V. piston 1 EN 8/SS
12 R.V. Spring 1 Spri. Steel
13 R.V. AD Screw 1 EN 8/SS
14 Base Plate 1 M.S.
15 Coup. Guard 1 Alumn.
16 Coupling 1 Flexible
17 Coup. Key 1 EN 8/SS
18 Sealing Sys. 2 OS/MS/GP
19 Dowel Pin 4 Silv. St
20 Comp. Flange 2 MS/SS
21 H/T Hex Bolt 12 En 8/SS
22 Inner Sleeve 4 En-31-57
23 V-Seal 4 Nitrile.Ru.
24 Snap Ring 1 EN-31
25 C.S.Screw 3 EN-24
Available Model Size & Capacity
Model
'PQ' BSP
Size
1440 RPM Capacity Pump
GD3in KGM2
Elec.
Motor
H.P.
FR. Size
LPM US GPM M3/HR
50
SML
1/2"
05.00
08.33
16.66
01.32
02.21
04.42
0.30
0.50
1.00
0.0001
0.0002
0.0003
0.50
1.00
1.50
71M
80M
90S
100
SML
1"
25.00
33.32
41.65
06.60
08.80
11.00
1.50
2.00
2.50
0.0005
0.0005
0.0008
1.00
2.00
3.00
80M
90L
100L
125
SML
1.1/4"
50.00
60.00
83.00
13.25
16.66
22.00
3.00
3.60
5.00
0.0005
0.0006
0.0008
2.00
3.00
5.00
90L
100L
112M
150
SML
1.1/2"
100.00
125.00
150.00
26.50
33.00
39.75
6.00
7.50
9.00
0.0045
0.0057
0.0068
3.00
5.00
7.50
100L
112M
132S
200
SML
2"
166.60
200.00
250.00
44.16
53.00
66.25
10.00
12.00
15.00
0.0068
0.0081
0.0100
5.00
10.00
15.00
112M
132M
160M
250
SML
2.1/2"
300.00
333.00
350.00
79.50
88.33
92.75
20.00
18.00
21.00
0.0160
0.0174
0.0185
7.50
15.00
20.00
132S
160M
160L
300
SML
3"
400.00
450.00
600.00
106.00
119.00
159.00
24.00
27.00
36.00
0.0361
0.0469
0.0560
25.00
30.00
35.00
180M
180L
200L
400
SML
4"
700.00
800.00
900.00
185.50
212.00
238.50
42.00
48.00
54.00
0.0750
0.0870
0.0980
40.00
50.00
60.00
200L
225S
225M
500
SML
5"
1000.00
1200.00
1400.00
265.00
318.00
371.00
60.00
72.00
84.00
0.1680
0.2800
0.2410
60.00
75.00
100.00
225M
250M
280S
600
SML
6"
1666.00
1915.00
2082.00
441.50
508.00
552.00
100.00
115.00
125.00
0.3245
0.3683
0.3947
75.00
100.00
120.00
250M
280S
280M
Pump Motor Coding
Sign # Indicates Pump Size
5-short, 6-medium, 7-long
Sign @ Indicates Pump Type
6-RDBX, 7-RDNX
RDBX-SERIES
Model
'PQ'
BSP
Size
Dimensions Weight
Bp-cou
pump
Bp-cou
in Kg
Product Code
Overall Mounting Shaft Flange Pump
A1 J
A
H2 L1 L2 H3 A2
F1
H7
A3
F3
H8
B1
B
S
C1
C
S1
E2
E1
E
H5
F
L
H6
H
I
H1 H4 M1 N1 R1
T
T1
ØD
P
Q
K
L
ØD1
G
M
ØD1
N
ØD3
R
50
SML
1/2"
455
505
522
139

206
235
251
225
425
450
475
140
150
180
143
153
162
196
112
175
460
173
180
125
119
8.5
75
40
15
123
133
58
100
100
112
89
71
60
115
124
134
104
113
123
370
405
430
112
112
140
04
15
40
11.5
04
13

22
25
8
Sq 65
M8
66

66.6
52

04
7.0
6.00
7.50
9D20#@
9D20#@
9D20#@
100
SML
1"
520
560
599
151

299
251
225
279
500
525
550
170
180
200
155
165
174
209
112
200
508
203
220
155
125
8.5
85
45
15
131
143
69
120
120
112
104
80
64
124
134
144
108
118
128
445
480
505
135
140
160
04
15
40
15
05
17

25
30
10
Sq 70
M8
83

73
68

04
10.15
11.00
13.0
9F20#@
9F20#@
9F20#@
125
SML
1.1/4"
591
630
658
185

250
235
289
323
550
600
600
180
200
230
189
195
211
236
141
220
610
245
220
190
155
10
110
50
15
153
168
81
120
135
141
100
90
70
144
154
166
124
134
146
495
545
545
140
160
190
04
15
50
21
06
23.5

30
40
10
Sq 80
M10
105

85
85

04
12.00
14.50
15.50
9H20#@
9H20#@
9H20#@
150
SML
1.1/2"
673
700
764
205

293
289
321
362
625
650
700
200
230
250
207
220
241
278
153
255
677
265
270
230
170
12
130
55
15
180
195
95
145
145
153
123
100
78
154
166
186
132
144
164
570
595
645
160
190
216
04
20
50
24
08
27

40
50
14
Sq 100
M12
125

106
100

04
15.00
24.00
18.75
9J20#@
9J20#@
9J20#@
200
SML
2"
746
850
950
234

339
338
377
435
700
825
900
230
250
285
238
258
286
338
173
315
762
285
340
290
200
12
180
70
19
222
223
94
190
165
173
164
112
86
181
205
229
155
175
203
630
755
830
190
216
230
04
20
65
27
08
30

40
55
14
Sq 120
M12
140

127
115

04
18.00
35.00
21.00
9K20#@
9K20#@
9K20#@
250
SML
2.1/2"
850
990
1030
261

375
287
445
445
800
900
950
260
315
315
266
294
294
355
173
320
882
325
340
290
225
15
180
80
19
223
250
104
190
190
173
161
132
103
211
239
239
182
210
210
550
650
700
200
254
254
04
25
75
32
10
35

50
60
14
Sq 135
M14
152

149
125

04
19.00
55.00
23.00
9L20#@
9L20#@
9L20#@
300
SML
3"
1165
1165
1235
338

436
568
568
616
1150
1150
1200
330
330
355
342
342
362

205

180
19

90
19

289
244

280
205

180
146
284
284
304
250
250
270
850
850
900
279
279
318
04
25
100
37
10
40

55
65

210
22


168


08
33.00
73.00
37.00
9M20#@
9M20#@
9M20#@
400
SML
4"
1285
1330
1360
375

487
616
666
666
1300
1400
1400
370
406
406
379
404
404

230

180
19

130
22

323
258

300
230

200
160
304
329
329
264
289
289
900
900
900
318
356
356
04
28
100
47
14
50.5

70
80

254
22


200


08
52.00
92.00
58.00
9N20#@
9N20#@
9N20#@
500
SML
5"
1405
1495
1590
420

533
691
794
854
1450
1550
1600
430
470
520
424
449
479

230

200
22

150
22

346
271

340
230

225
179
354
379
409
308
333
363
1050
1050
1150
356
406
457
04
28
150
52
16
56

75
85

279
22


235


08
52.00
142.00
76.00
9P20#@
9P20#@
9P20#@
600
SML
6"
1510
1610
1610
467

550
819
879
879
1650
1700
1700
470
520
520
471
501
501

245

215
22

170
22

358
293

345
245

250
200
404
434
434
354
384
384
1150
1150
1150
406
457
457
04
28
150
57
16
61

80
95

317
22


270


12
78.00
173.00
85.00
9R20#@
9R20#@
9R20#@
PumpRDBX-RDNX-4

Pump Operation & Performance Characteristics

Gear pump is the most versatile rotary positive displacement pump & it scores over other types of Pd pumps viz. Screw, Vane, Lobe, Tracoidal, Radial piston etc. & therefore it is used for the widest range of application i.e. loading-unloading, transfer, fuel pressurizing, hydraulic, lubrication in IC engines, Polymers metering applications etc. Gear pump can develop high pressure uo tp 210 bar in same configuration simply by tightening the working clearances & improving the workmanship, whereas in screw pump the thread length is needed to increase making the pump bulky & difficult to manufacture. In gear pump each tooth gap contributes to the capacity while in screw pump only one pitch length contributes to the capacity thus gear pumps are always cpmpact & efficient. The capacity of the pump varies directly with speed but remain constant against pressure, however some liquid always by-passes to suction due to running clearance between the casing & impeller causing slip which depends upon the differential pressure, viscosity of the liquid & the workmanship. Gear pumps are capable of handling liquids of any viscosity, th slip reduces with increse in viscocity but the frictional power increses. Though the pump has a self priming capability some net positive suction head(NPSH) is always required to avoid cavitation, this again depends on the viscosity of the liquid to be pumped & the pumping speed.

Internal power losses

In rotary gear pumps are of two types.The mechanical loss is the power required to overcome friction drag of all the moving part within the pump while viscous loss is power loss due to fluid viscous drag & shearing action of the fluid, this can be calculated from the graph shown here.

Horse power calculation

The bhp required to drive a rotary pump is sum of the theoretical HP & internal losses. The former is the actual work done in moving the fluid from inlet pressure condition to outlet pressure condition & is product of constant C=0.037, Capacity in M3/hr. & Pressure in Kg/CM2 or Constant c-2.3, Capacity in GPM & Pressure in PSI.

Gear Pump Selection & uses

RDBX/NX series pump are medium pressure pumps designed for viscous pressure application up to 21 bar. The bush bearing version type RDBX is used for clean or dirty viscous & semi viscous liquid where the shaft surface speed is less. Pump upto 21/2" size can be run at 1440 RPM & for higher size the speed should be reduced to 960 RPM or lower. The self-lubricated needle roller bearing type can be used for clear viscous liquid & can be run at 1440 RPM for all the sizes. This pump are ideally suited for fuel pressuring, hydraulic, medium pressure lubrication & transfer applications.

Inspection & testing

All pumps are assembled after due inspection of each & every parts & than they are tested for duty parameters in accordance with API-676 & JIS-B 8312-1976. Third party inspection are also offered, we are approved by following consultants & inspection agencies.


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