GDL Series Vertical Multistage Inline Centrifugal Pump

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Product Overview

Product Definition: The GDL Vertical Multistage Centrifugal Pump is a fluid transfer equipment designed per JB/Q6435.92 standard, featuring a vertical sectional stainless steel casing with coaxial same-diameter inlet/outlet on the same horizontal plane, enabling direct in-line installation without pipeline modification.

Problem Solved: Addresses operational challenges including high-pressure delivery in space-constrained environments, complex pipeline retrofitting, mechanical seal leakage, and elevated energy consumption during prolonged operation.

Application Scenarios: Suitable for high-rise building water supply, boiler feedwater, fire pressure boosting, industrial process circulation, and RO pretreatment systems requiring high head, low flow, zero-leakage performance, and compact installation footprint.

Product Advantages

Extended Service Life: Standard SiC/tungsten carbide mechanical seals + 304/316 stainless steel wetted parts resist corrosion & cavitation. Design lifespan ≥10 years—over 35% longer than standard cast-iron multi-stage pumps.
Significant Energy Savings: CFD-optimized hydraulic model + low-friction diffusers improve rated efficiency by 8%–12%. Combined with on-demand system regulation, annual electricity costs drop by 20%–30%.
Lower Maintenance Costs: Back-pull-out design + top-mounted lubrication port enables seal replacement & bearing maintenance without disconnecting piping. Single maintenance reduced to 1.5 hours, cutting labor costs by 50%.
Lightweight & Compact Design: Vertical segmented layout eliminates traditional baseplate & coupling guards. Overall weight reduced by ~18% for equivalent power ratings, lowering floor load & lifting complexity.
Faster Installation: Identical-diameter inline ports + zero-alignment flange technology require no pipeline cutting/modification. Standard units reach commissioning readiness within 2 hours from unboxing, compressing installation cycle by 45%.

Application Scenarios

High-Pressure Water Supply & Circulation: Domestic water supply for high-rise buildings (multi-pump parallel pressure stabilization), fire protection boosting, industrial high-pressure wash fluid transport.
HVAC & Boiler Systems: HVAC cooling water circulation, chilled water boosting, boiler feedwater at high temperatures (media ≤80℃/176℉).
Media Compatibility: Clean water or liquids with similar physicochemical properties. Temperature range: -15℃ to +80℃ (5℉ to 176℉). Max system working pressure <2.5 MPa.
Special Condition Support: For weakly corrosive media or elevated temperatures, upgrade to 316L/duplex steel materials and high-temperature mechanical seals upon request.

Technical Parameters

Model Designation

Simplified Structural Diagram Of GDL Type Pump

	1	Pump Casing
	2	Tie Bolt
	3	Shell Assembly
	4	Impeller
	5	Impeller Sleeve
	6	Shaft Sleeve
	7	Gasket
	8	Hex Nut
	9	Dowel Pin
	10	Pump Motor
	11	Coupling
	12	Pump Adapter
	13	Bleeder Valve
	14	Mechanical Seal
	15	Pump Shaft
	16	Stage Casing
	17	Sleeve Retaining Nut
	18	Bearing Bush
	19	Seal Drain Line

Performance Parameters

Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
25GDL2-12×3	1.4	0.39	38	23	2900	0.63	1.1	1.4	606	60
25GDL2-12×3	2	0.56	36	30	2900	0.65	1.1	1.7	606	60
25GDL2-12×3	2.4	0.67	33	32	2900	0.67	1.1	1.8	606	60
25GDL2-12×4	1.4	0.39	50	23	2900	0.83	1.1	1.4	646	64
25GDL2-12×4	2	0.56	48	30	2900	0.87	1.1	1.7	646	64
25GDL2-12×4	2.4	0.67	44	32	2900	0.9	1.1	1.8	646	64
25GDL2-12×5	1.4	0.39	63	23	2900	1.04	1.5	1.4	711	73
25GDL2-12×5	2	0.56	60	30	2900	1.09	1.5	1.7	711	73
25GDL2-12×5	2.4	0.67	55	32	2900	1.12	1.5	1.8	711	73
25GDL2-12×6	1.4	0.39	76	23	2900	1.26	1.5	1.4	751	76
25GDL2-12×6	2	0.56	72	30	2900	1.35	1.5	1.7	751	76
25GDL2-12×6	2.4	0.67	66	32	2900	1.3	1.5	1.8	751	76
25GDL2-12×7	1.4	0.39	88	23	2900	1.46	2.2	1.4	816	83
25GDL2-12×7	2	0.56	84	30	2900	1.52	2.2	1.7	816	83
25GDL2-12×7	2.4	0.67	77	32	2900	1.57	2.2	1.8	816	83
25GDL2-12×8	1.4	0.39	101	23	2900	1.63	2.2	1.4	856	87
25GDL2-12×8	2	0.56	96	30	2900	1.74	2.2	1.7	856	87
25GDL2-12×8	2.4	0.67	88	32	2900	1.8	2.2	1.8	856	87
25GDL2-12×9	1.4	0.39	114	23	2900	1.89	2.2	1.4	896	92
25GDL2-12×9	2	0.56	108	30	2900	1.96	2.2	1.7	896	92
25GDL2-12×9	2.4	0.67	99	32	2900	2.02	2.2	1.8	896	92
25GDL2-12×10	1.4	0.39	126	23	2900	2.01	3	1.4	981	105
25GDL2-12×10	2	0.56	120	30	2900	2.17	3	1.7	981	105
25GDL2-12×10	2.4	0.67	110	32	2900	2.24	3	1.8	981	105
25GDL2-12×11	1.4	0.39	139	23	2900	2.31	3	1.4	1021	109
25GDL2-12×11	2	0.56	132	30	2900	2.39	3	1.7	1021	109
25GDL2-12×11	2.4	0.67	121	32	2900	2.47	3	1.8	1021	109
25GDL2-12×12	1.4	0.39	152	23	2900	2.52	3	1.4	1061	113
25GDL2-12×12	2	0.56	144	30	2900	2.61	3	1.7	1061	113
25GDL2-12×12	2.4	0.67	132	32	2900	2.7	3	1.8	1061	113
25GDL2-12×13	1.4	0.39	164	23	2900	2.72	4	1.4	1221	127
25GDL2-12×13	2	0.56	156	30	2900	2.83	4	1.7	1221	127
25GDL2-12×13	2.4	0.67	144	32	2900	2.94	4	1.8	1221	127
25GDL2-12×14	1.4	0.39	176	23	2900	2.92	4	1.4	1261	130
25GDL2-12×14	2	0.56	168	30	2900	3.05	4	1.7	1261	130
25GDL2-12×14	2.4	0.67	156	32	2900	3.17	4	1.8	1261	130
25GDL2-12×15	1.4	0.39	188	23	2900	3.12	4	1.4	1301	135
25GDL2-12×15	2	0.56	180	30	2900	3.27	4	1.7	1301	135
25GDL2-12×15	2.4	0.67	168	32	2900	3.43	4	1.8	1301	135
Model	Flow Rate		Head (m)	Efficiency (%) Speed (r/min)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%) Speed (r/min)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
40GDL6-12×3	4.2	1.17	41	43	2900	1.09	1.5	1.4	657	71
40GDL6-12×3	6	1.67	36	52	2900	1.13	1.5	1.7	657	71
40GDL6-12×3	7.2	2	30.5		2900	1.15	1.5	1.8	657	71
40GDL6-12×4	4.2	1.17	54	43	2900	1.45	2.2	1.4	722	80
40GDL6-12×4	6	1.67	48	52	2900	1.5	2.2	1.7	722	80
40GDL6-12×4	7.2	2	40.6		2900	1.53	2.2	1.8	722	80
40GDL6-12×5	4.2	1.17	68	43	2900	1.81	2.2	1.4	762	85
40GDL6-12×5	6	1.67	60	52	2900	1.88	2.2	1.7	762	85
40GDL6-12×5	7.2	2	51		2900	1.92	2.2	1.8	762	85
40GDL6-12×6	4.2	1.17	82	43	2900	2.18	3	1.4	847	101
40GDL6-12×6	6	1.67	72	52	2900	2.25	3	1.7	847	101
40GDL6-12×6	7.2	2	61		2900	2.3	3	1.8	847	101
40GDL6-12×7	4.2	1.17	95	43	2900	2.54	3	1.4	887	107
40GDL6-12×7	6	1.67	84	52	2900	2.64	3	1.7	887	107
40GDL6-12×7	7.2	2	71		2900	2.69	3	1.8	887	107
40GDL6-12×8	4.2	1.17	108	43	2900	2.91	4	1.4	967	123
40GDL6-12×8	6	1.67	96	52	2900	3.01	4	1.7	967	123
40GDL6-12×8	7.2	2	81		2900	3.07	4	1.8	967	123
40GDL6-12×9	4.2	1.17	123	43	2900	3.27	4	1.4	1007	129
40GDL6-12×9	6	1.67	108	52	2900	3.39	4	1.7	1007	129
40GDL6-12×9	7.2	2	91		2900	3.45	4	1.8	1007	129
40GDL6-12×10	4.2	1.17	136	43	2900	3.63	4	1.4	1047	133
40GDL6-12×10	6	1.67	120	52	2900	3.77	4	1.7	1047	133
40GDL6-12×10	7.2	2	102		2900	3.84	4	1.8	1047	133
40GDL6-12×11	4.2	1.17	150	43	2900	4	5.5	1.4	1132	156
40GDL6-12×11	6	1.67	132	52	2900	4.15	5.5	1.7	1132	156
40GDL6-12×11	7.2	2	112		2900	4.22	5.5	1.8	1132	156
40GDL6-12×12	4.2	1.17	164	43	2900	4.36	5.5	1.4	1172	161
40GDL6-12×12	6	1.67	144	52	2900	4.52	5.5	1.7	1172	161
40GDL6-12×12	7.2	2	122		2900	4.6	5.5	1.8	1172	161
40GDL6-12×13	4.2	1.17	176	43	2900	4.68	7.5	1.4	1252	174
40GDL6-12×13	6	1.67	156	52	2900	4.9	7.5	1.7	1252	174
40GDL6-12×13	7.2	2	134		2900	5.05	7.5	1.8	1252	174
40GDL6-12×14	4.2	1.17	186	43	2900	5	7.5	1.4	1292	180
40GDL6-12×14	6	1.67	168	52	2900	5.28	7.5	1.7	1292	180
40GDL6-12×14	7.2	2	146		2900	5.51	7.5	1.8	1292	180
40GDL6-12×15	4.2	1.17	200	43	2900	5.32	7.5	1.4	1332	185
40GDL6-12×15	6	1.67	180	52	2900	5.96	7.5	1.7	1332	185
40GDL6-12×15	7.2	2	155		2900	5.96	7.5	1.8	1332	185
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
50GDL12-15×2	8.4	2.33	36	48	2900	1.72	2.2	1.4	766	75
50GDL12-15×2	12	3.33	30	56	2900	1.75	2.2	1.7	766	75
50GDL12-15×2	14.4	4	24	53	2900	1.85	2.2	1.8	766	75
50GDL12-15×3	8.4	2.33	54	48	2900	2.57	3	1.4	866	89
50GDL12-15×3	12	3.33	45	56	2900	2.63	3	1.7	866	89
50GDL12-15×3	14.4	4	36	53	2900	2.78	3	1.8	866	89
50GDL12-15×4	8.4	2.33	72	48	2900	3.43	4	1.4	1001	103
50GDL12-15×4	12	3.33	60	56	2900	3.5	4	1.7	1001	103
50GDL12-15×4	14.4	4	48	53	2900	3.7	4	1.8	1001	103
50GDL12-15×5	8.4	2.33	90	48	2900	4.2	5.5	1.4	1126	125
50GDL12-15×5	12	3.33	75	56	2900	4.27	5.5	1.7	1126	125
50GDL12-15×5	14.4	4	60	53	2900	4.63	5.5	1.8	1126	125
50GDL12-15×6	8.4	2.33	108	48	2900	5.15	5.5	1.4	1201	130
50GDL12-15×6	12	3.33	90	56	2900	5.25	5.5	1.7	1201	130
50GDL12-15×6	14.4	4	72	53	2900	5.55	5.5	1.8	1201	130
50GDL12-15×7	8.4	2.33	126	48	2900	6	7.5	1.4	1276	140
50GDL12-15×7	12	3.33	105	56	2900	6.12	7.5	1.7	1276	140
50GDL12-15×7	14.4	4	84	53	2900	6.48	7.5	1.8	1276	140
50GDL12-15×8	8.4	2.33	144	48	2900	6.86	7.5	1.4	1351	147
50GDL12-15×8	12	3.33	120	56	2900	7	7.5	1.7	1351	147
50GDL12-15×8	14.4	4	96	53	2900	7.4	7.5	1.8	1351	147
50GDL12-15×9	8.4	2.33	162	48	2900	7.72	11	1.4	1556	203
50GDL12-15×9	12	3.33	135	56	2900	7.87	11	1.7	1556	203
50GDL12-15×9	14.4	4	108	53	2900	8.33	11	1.8	1556	203
50GDL12-15×10	8.4	2.33	180	48	2900	8.58	11	1.4	1631	208
50GDL12-15×10	12	3.33	150	56	2900	8.75	11	1.7	1631	208
50GDL12-15×10	14.4	4	120	53	2900	9.25	11	1.8	1631	208
50GDL12-15×11	8.4	2.33	195	48	2900	9.29	15	1.4	1706	222
50GDL12-15×11	12	3.33	165	56	2900	9.99	15	1.7	1706	222
50GDL12-15×11	14.4	4	135	53	2900	9.63	15	1.8	1706	222
50GDL12-15×12	8.4	2.33	210	48	2900	10	15	1.4	1781	230
50GDL12-15×12	12	3.33	180	56	2900	10.5	15	1.7	1781	230
50GDL12-15×12	14.4	4		53	2900	11.1	15	1.8	1781	230
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
50GDL18-15×2	12.6	3.5	36	53	2900	2.33	3	1.4	791	83
50GDL18-15×2	18	5	30	62	2900	2.37	3	1.7	791	83
50GDL18-15×2	21.6	6	25		2900	2.37	3	1.8	791	83
50GDL18-15×3	12.6	3.5	54	53	2900	3.5	4	1.4	926	99
50GDL18-15×3	18	5	45	62	2900	3.56	4	1.7	926	99
50GDL18-15×3	21.6	6	37.5		2900	3.56	4	1.8	926	99
50GDL18-15×4	12.6	3.5	72	53	2900	4.66	5.5	1.4	1051	120
50GDL18-15×4	18	5	60	62	2900	4.75	5.5	1.7	1051	120
50GDL18-15×4	21.6	6	50		2900	4.75	5.5	1.8	1051	120
50GDL18-15×5	12.6	3.5	90	53	2900	5.83	7.5	1.4	1126	130
50GDL18-15×5	18	5	75	62	2900	5.93	7.5	1.7	1126	130
50GDL18-15×5	21.6	6	62.5		2900	5.93	7.5	1.8	1126	130
50GDL18-15×6	12.6	3.5	108	53	2900	7	7.5	1.4	1201	135
50GDL18-15×6	18	5	90	62	2900	7.12	7.5	1.7	1201	135
50GDL18-15×6	21.6	6	75		2900	7.12	7.5	1.8	1201	135
50GDL18-15×7	12.6	3.5	125	53	2900	8.16	11	1.4	1406	185
50GDL18-15×7	18	5	105	62	2900	8.3	11	1.7	1406	185
50GDL18-15×7	21.6	6	82.5		2900	8.31	11	1.8	1406	185
50GDL18-15×8	12.6	3.5	144	53	2900	9.32	11	1.4	1481	192
50GDL18-15×8	18	5	120	62	2900	9.49	11	1.7	1481	192
50GDL18-15×8	21.6	6	100		2900	9.49	11	1.8	1481	192
50GDL18-15×9	12.6	3.5	162	53	2900	10.49	15	1.4	1556	208
50GDL18-15×9	18	5	135	62	2900	10.68	15	1.7	1556	208
50GDL18-15×9	21.6	6	112.5		2900	10.68	15	1.8	1556	208
50GDL18-15×10	12.6	3.5	180	53	2900	11.66	15	1.4	1631	213
50GDL18-15×10	18	5	150	62	2900	11.87	15	1.7	1631	213
50GDL18-15×10	21.6	6	125		2900	11.87	15	1.8	1631	213
50GDL18-15×11	12.6	3.5	195	53	2900	12.6	15	1.4	1751	232
50GDL18-15×11	18	5	165	62	2900	13	15	1.7	1751	232
50GDL18-15×11	21.6	6	140		2900	13.3	15	1.8	1751	232
50GDL18-15×12	12.6	3.5	210	53	2900	13.6	15	1.4	1826	240
50GDL18-15×12	18	5	180	62	2900	14.2	15	1.7	1826	240
50GDL18-15×12	21.6	6	155		2900	14.7	15	1.8	1826	240
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
65GDL24-12×2	16.8	4.67	27	56	2900	2.21	3	2.9	821	98
65GDL24-12×2	24	6.67	24	65	2900	2.41	3	3	821	98
65GDL24-12×2	28.8	8	22	67	2900	2.57	3	3.1	821	98
65GDL24-12×3	16.8	4.67	40.5	56	2900	3.31	4	2.9	936	113
65GDL24-12×3	24	6.67	36	65	2900	3.62	4	3	936	113
65GDL24-12×3	28.8	8	33	67	2900	3.87	4	3.1	936	113
65GDL24-12×4	16.8	4.67	54	56	2900	4.41	5.5	2.9	1061	134
65GDL24-12×4	24	6.67	48	65	2900	4.83	5.5	3	1061	134
65GDL24-12×4	28.8	8	44	67	2900	5.15	5.5	3.1	1061	134
65GDL24-12×5	16.8	4.67	67.5	56	2900	5.52	7.5	2.9	1136	143
65GDL24-12×5	24	6.67	60	65	2900	6.04	7.5	3	1136	143
65GDL24-12×5	28.8	8	55	67	2900	6.42	7.5	3.1	1136	143
65GDL24-12×6	16.8	4.67	81	56	2900	6.62	7.5	2.9	1211	148
65GDL24-12×6	24	6.67	72	65	2900	7.24	7.5	3	1211	148
65GDL24-12×6	28.8	8	66	67	2900	7.73	7.5	3.1	1211	148
65GDL24-12×7	16.8	4.67	94.5	56	2900	7.72	11	2.9	1416	198
65GDL24-12×7	24	6.67	84	65	2900	8.45	11	3	1416	198
65GDL24-12×7	28.8	8	77	67	2900	9.01	11	3.1	1416	198
65GDL24-12×8	16.8	4.67	108	56	2900	8.85	11	2.9	1491	202
65GDL24-12×8	24	6.67	96	65	2900	9.63	11	3	1491	202
65GDL24-12×8	28.8	8	88	67	2900	10.3	11	3.1	1491	202
65GDL24-12×9	16.8	4.67	121.5	56	2900	9.93	15	2.9	1556	213
65GDL24-12×9	24	6.67	108	65	2900	10.85	15	3	1556	213
65GDL24-12×9	28.8	8	99	67	2900	11.59	15	3.1	1556	213
65GDL24-12×10	16.8	4.67	135	56	2900	11	15	2.9	1641	221
65GDL24-12×10	24	6.67	120	65	2900	12.06	15	3	1641	221
65GDL24-12×10	28.8	8	110	67	2900	12.88	15	3.1	1641	221
65GDL24-12×11	16.8	4.67	147	56	2900	12	15	2.9	1731	239
65GDL24-12×11	24	6.67	132	65	2900	13.3	15	3	1731	239
65GDL24-12×11	28.8	8	122	67	2900	14.3	15	3.1	1731	239
65GDL24-12×12	16.8	4.67	159	56	2900	13	15	2.9	1816	249
65GDL24-12×12	24	6.67	144	65	2900	14.5	15	3	1816	249
65GDL24-12×12	28.8	8	134	67	2900	15.7	15	3.1	1816	249
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
80GDL36-12×2	25.2	7	27	59	2900	3.14	4	3.5	917	163
80GDL36-12×2	36	10	24	68	2900	3.46	4	4	917	163
80GDL36-12×2	43.2	12	21	67	2900	3.68	4	4.2	917	163
80GDL36-12×3	25.2	7	40.5	59	2900	4.71	5.5	3.5	1052	195
80GDL36-12×3	36	10	36	68	2900	5.19	5.5	4	1052	195
80GDL36-12×3	43.2	12	31.5	67	2900	5.53	5.5	4.2	1052	195
80GDL36-12×4	25.2	7	54	59	2900	6.29	7.5	3.5	1137	210
80GDL36-12×4	36	10	48	68	2900	6.92	7.5	4	1137	210
80GDL36-12×4	43.2	12	42	67	2900	7.37	7.5	4.2	1137	210
80GDL36-12×5	25.2	7	67.5	59	2900	7.86	11	3.5	1352	245
80GDL36-12×5	36	10	60	68	2900	8.67	11	4	1352	245
80GDL36-12×5	43.2	12	52.5	67	2900	9.22	11	4.2	1352	245
80GDL36-12×6	25.2	7	81	59	2900	9.43	11	3.5	1437	220
80GDL36-12×6	36	10	72	68	2900	10.39	11	4	1437	220
80GDL36-12×6	43.2	12	63	67	2900	11.06	11	4.2	1437	220
80GDL36-12×7	25.2	7	94.5	59	2900	11	15	3.5	1522	265
80GDL36-12×7	36	10	84	68	2900	12.12	15	4	1522	265
80GDL36-12×7	43.2	12	73.5	67	2900	12.9	15	4.2	1522	265
80GDL36-12×8	25.2	7	108	59	2900	12.58	15	3.5	1607	275
80GDL36-12×8	36	10	96	68	2900	13.85	15	4	1607	275
80GDL36-12×8	43.2	12	84	67	2900	14.75	15	4.2	1607	275
80GDL36-12×9	25.2	7	121.5	59	2900	14.14	18.5	3.5	1737	295
80GDL36-12×9	36	10	108	68	2900	15.59	18.5	4	1737	295
80GDL36-12×9	43.2	12	94.5	67	2900	16.59	18.5	4.2	1737	295
80GDL36-12×10	25.2	7	135	59	2900	15.71	18.5	3.5	1822	310
80GDL36-12×10	36	10	120	68	2900	17.31	18.5	4	1822	310
80GDL36-12×10	43.2	12	105	67	2900	18.31	18.5	4.2	1822	310
80GDL36-12×11	25.2	7	148.5	59	2900	16.81	22	3.5	1911	355
80GDL36-12×11	36	10	132	68	2900	18.62	22	4	1911	355
80GDL36-12×11	43.2	12	115.5	67	2900	19.6	22	4.2	1911	355
80GDL36-12×12	25.2	7	162	59	2900	17.58	22	3.5	2026	365
80GDL36-12×12	36	10	144	68	2900	19.25	22	4	2026	365
80GDL36-12×12	43.2	12	126	67	2900	20.63	22	4.2	2026	365
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
80GDL54-14×2	37.8	10.5	34	62	2900	5.38	7.5	4	967	185
80GDL54-14×2	54	15	28	70	2900	6.01	7.5	4.2	967	185
80GDL54-14×2	64.8	18	25	73.5	2900	7.97	7.5	3.7	967	185
80GDL54-14×3	37.8	10.5	51	62	2900	8.82	11	4	1182	245
80GDL54-14×3	54	15	42	70	2900	9.01	11	4.2	1182	245
80GDL54-14×3	64.8	18	37.5	73.5	2900	9.01	11	3.7	1182	245
80GDL54-14×4	37.8	10.5	64	62	2900	10.13	15	4	1267	260
80GDL54-14×4	54	15	56	70	2900	12.01	15	4.2	1267	260
80GDL54-14×4	64.8	18	50	73.5	2900	12.01	15	3.7	1267	260
80GDL54-14×5	37.8	10.5	80	62	2900	13.3	18.5	4	1397	260
80GDL54-14×5	54	15	70	70	2900	14.7	18.5	4.2	1397	260
80GDL54-14×5	64.8	18	62.5	73.5	2900	15	18.5	3.7	1397	260
80GDL54-14×6	37.8	10.5	96	62	2900	15.9	18.5	4	1482	235
80GDL54-14×6	54	15	84	70	2900	17.64	18.5	4.2	1482	235
80GDL54-14×6	64.8	18	75	73.5	2900	18.6	18.5	3.7	1482	235
80GDL54-14×7	37.8	10.5	112	62	2900	20.58	22	4	1592	315
80GDL54-14×7	54	15	98	70	2900	21	22	4.2	1592	315
80GDL54-14×7	64.8	18	87.5	73.5	2900	21	22	3.7	1592	315
80GDL54-14×8	37.8	10.5	128	62	2900	21.3	30	4	1607	390
80GDL54-14×8	54	15	112	70	2900	23.54	30	4.2	1607	390
80GDL54-14×8	64.8	18	100	73.5	2900	24	30	3.7	1607	390
80GDL54-14×9	37.8	10.5	144	62	2900	23.49	30	4	1757	400
80GDL54-14×9	54	15	126	70	2900	26.49	30	4.2	1757	400
80GDL54-14×9	64.8	18	112.5	73.5	2900	27	30	3.7	1757	400
80GDL54-14×10	37.8	10.5	160	62	2900	26.43	37	4	1882	425
80GDL54-14×10	54	15	140	70	2900	29.3	37	4.2	1882	425
80GDL54-14×10	64.8	18	125	73.5	2900	30	37	3.7	1882	425
80GDL50-20×2	40	11.1	40	70	2900	6.78	11	3.1	1117	230
80GDL50-20×2	50	13.9	31.7		2900	7.26	11	3.8	1117	230
80GDL50-20×2	68.4	19		75	2900	8.44	11	5.3	1117	230
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
80GDL50-20×3	40	11.1	66.4	70	2900	10.89	15	3.1	1147	250
80GDL50-20×3	50	13.9	60		2900	12.57	15	3.8	1147	250
80GDL50-20×3	68.4	19	70.3	75	2900	13.56	15	5.3	1147	250
80GDL50-20×4	40	11.1	87.2	70	2900	14.57	18.5	3.1	1307	270
80GDL50-20×4	50	13.9	78		2900	16.31	18.5	3.8	1307	270
80GDL50-20×4	68.4	19	70	75	2900	17.76	18.5	5.3	1307	270
80GDL50-20×5	40	11.1	109	70	2900	18.06	22	3.1	1422	300
80GDL50-20×5	50	13.9	97.5		2900	20.09	22	3.8	1422	300
80GDL50-20×5	68.4	19	80	75	2900	21.59	22	5.3	1422	300
80GDL50-20×6	40	11.1	130	70	2900	21.3	30	3.1	1617	340
80GDL50-20×6	50	13.9	116		2900	23.75	30	3.8	1617	340
80GDL50-20×6	68.4	19	96	75	2900	25.8	30	5.3	1617	340
80GDL50-20×7	40	11.1	152	70	2900	25.14	37	3.1	1702	380
80GDL50-20×7	50	13.9	136		2900	27.92	37	3.8	1702	380
80GDL50-20×7	68.4	19	112	75	2900	30.27	37	5.3	1702	380
80GDL50-20×8	40	11.1	174	70	2900	28.93	45	3.1	1787	400
80GDL50-20×8	50	13.9	157		2900	32.24	45	3.8	1787	400
80GDL50-20×8	68.4	19	129	75	2900	34.83	45	5.3	1787	400
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
100GDL72-14×2	50.4	14	32	64	2900	6.87	11	4.2	1200	240
100GDL72-14×2	72	20	28	73	2900	7.53	11	4.5	1200	240
100GDL72-14×2	86.4	24	24		2900	7.9	11	4.7	1200	240
100GDL72-14×3	50.4	14	48	64	2900	10.29	15	4.2	1335	265
100GDL72-14×3	72	20	42	73	2900	11.26	15	4.5	1335	265
100GDL72-14×3	86.4	24	36		2900	12	15	4.7	1335	265
100GDL72-14×4	50.4	14	64	64	2900	13.57	18.5	4.2	1460	285
100GDL72-14×4	72	20	56	73	2900	15.48	18.5	4.5	1460	285
100GDL72-14×4	86.4	24	48		2900	16.55	18.5	4.7	1460	285
100GDL72-14×6	50.4	14	96	64	2900	20.22	30	4.2	1740	350
100GDL72-14×6	72	20	84	73	2900	22.57	30	4.5	1740	350
100GDL72-14×6	86.4	24	73		2900	24.57	30	4.7	1740	350
100GDL72-14×7	50.4	14	112	64	2900	24.63	30	4.2	1825	400
100GDL72-14×7	72	20	98	73	2900	27.09	30	4.5	1825	400
100GDL72-14×7	86.4	24	85		2900	29.61	30	4.7	1825	400
100GDL72-14×8	50.4	14	128	64	2900	27.64	37	4.2	1900	420
100GDL72-14×8	72	20	112	73	2900	30.39	37	4.5	1900	420
100GDL72-14×8	86.4	24	98		2900	33.47	37	4.7	1900	420
100GDL72-14×9	50.4	14	144	64	2900	30.39	42	4.2	1980	430
100GDL72-14×9	72	20	126	73	2900	33.83	42	4.5	1980	430
100GDL72-14×9	86.4	24	110		2900	37.29	42	4.7	1980	430
100GDL72-14×10	50.4	14	160	64	2900	38.03	45	4.2	2070	510
100GDL72-14×10	72	20	140	73	2900	38.45	45	4.5	2070	510
100GDL72-14×10	86.4	24	120		2900	40.03	45	4.7	2070	510
100GDL72-20×2	54	15	49.4	71	2900	10.3	15	3.1	1127	245
100GDL72-20×2	75	20.8	41	68	2900	11.09	15	3.5	1127	245
100GDL72-20×2	90	25	34		2900	11.26	15	3.8	1127	245
100GDL72-20×3	54	15	80	71	2900	17.26	18.5	3.1	1232	275
100GDL72-20×3	75	20.8	66	68	2900	18.2	18.5	3.5	1232	275
100GDL72-20×3	90	25	55		2900	19.08	18.5	3.8	1232	275
100GDL72-20×4	54	15	99	71	2900	20.8	22	3.1	1467	390
100GDL72-20×4	75	20.8	82	68	2900	22	22	3.5	1467	390
100GDL72-20×4	90	25	68		2900	23.3	22	3.8	1467	390
100GDL72-20×5	54	15	118	71	2900	24.6	30	3.1	1552	380
100GDL72-20×5	75	20.8	98	68	2900	26.5	30	3.5	1552	380
100GDL72-20×5	90	25	80		2900	28.05	30	3.8	1552	380
100GDL72-20×6	54	15	148	71	2900	30.8	37	3.1	1637	360
100GDL72-20×6	75	20.8	123	68	2900	32.7	37	3.5	1637	360
100GDL72-20×6	90	25	95		2900	34.2	37	3.8	1637	360
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
100GDL72-20×7	54	15	173	71	2900	36	45	3.1	1762	480
100GDL72-20×7	72	20	140	73	2900	39	45	3.5	1762	480
100GDL72-20×7	90	25	110	68	2900	40.7	45	3.8	1762	480
100GDL72-20×8	54	15	198	71	2900	41.2	55	3.1	1957	570
100GDL72-20×8	72	20	160	73	2900	43.71	55	3.5	1957	570
100GDL72-20×8	90	25	126	68	2900	45.6	55	3.8	1957	570
100GDL72-20×9	54	15	220	71	2900	52.92	75	3.1	2012	750
100GDL72-20×9	72	20	180	73	2900	61.25	75	3.5	2012	750
100GDL72-20×9	90	25	150	68	2900	64.08	75	3.8	2012	750
100GDL100-20×2	70	19.4	46	65	2900	13.5	18.5	4.2	1345	248
100GDL100-20×2	100	27.7	40	74	2900	14.7	18.5	4.5	1345	248
100GDL100-20×2	120	33.3	34	73	2900	15.2	18.5	4.7	1345	248
100GDL100-20×3	70	19.4	69	65	2900	20.2	30	4.2	1598	360
100GDL100-20×3	100	27.7	60	74	2900	22.1	30	4.5	1598	360
100GDL100-20×3	120	33.3	51	73	2900	22.8	30	4.7	1598	360
100GDL100-20×4	70	19.4	92	65	2900	27	37	4.2	1715	390
100GDL100-20×4	100	27.7	80	74	2900	29.5	37	4.5	1715	390
100GDL100-20×4	120	33.3	68	73	2900	30.4	37	4.7	1715	390
100GDL100-20×5	70	19.4	115	65	2900	33.7	45	4.2	1959	470
100GDL100-20×5	100	27.7	100	74	2900	36.8	45	4.5	1959	470
100GDL100-20×5	120	33.3	85	73	2900	38.1	45	4.7	1959	470
100GDL100-20×6	70	19.4	138	65	2900	40.5	55	4.2	2106	540
100GDL100-20×6	100	27.7	120	74	2900	44.2	55	4.5	2106	540
100GDL100-20×6	120	33.3	102	73	2900	45.7	55	4.7	2106	540
100GDL100-20×7	70	19.4	161	65	2900	47.2	75	4.2	2291	680
100GDL100-20×7	100	27.7	140	74	2900	51.5	75	4.5	2291	680
100GDL100-20×7	120	33.3	119	73	2900	53.3	75	4.7	2291	680
100GDL100-20×8	70	19.4	181	65	2900	54	75	4.2	2408	730
100GDL100-20×8	100	27.7	160	74	2900	58.9	75	4.5	2408	730
100GDL100-20×8	120	33.3	136	73	2900	60.9	75	4.7	2408	730
100GDL100-20×9	70	19.4	207	65	2900	60.7	75	4.2	2575	740
100GDL100-20×9	100	27.7	180	74	2900	66.3	75	4.5	2575	740
100GDL100-20×9	120	33.3	153	73	2900	68.5	75	4.7	2575	740
100GDL100-20×10	70	19.4	230	65	2900	67.5	90	4.2	2692	790
100GDL100-20×10	100	27.7	200	74	2900	73.6	90	4.5	2692	790
100GDL100-20×10	120	33.3	170	73	2900	76.1	90	4.7	2692	790
125GDL100-20×2	70	19.4	46	65	2900	13.5	18.5	4.2	1185	265
125GDL100-20×2	100	27.7	40	74	2900	14.7	18.5	4.5	1185	265
125GDL100-20×2	120	33.3	34	73	2900	15.2	18.5	4.7	1185	265
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
125GDL100-20×3	70	19.4	69	65	2900	20.2	30	4.2	1315	390
125GDL100-20×3	100	27.7	60	74	2900	22.1	30	4.5	1315	390
125GDL100-20×3	120	33.3	51	73	2900	22.8	30	4.7	1315	390
125GDL100-20×4	70	19.4	92	65	2900	27	37	4.2	1410	410
125GDL100-20×4	100	27.7	80	74	2900	29.5	37	4.5	1410	410
125GDL100-20×4	120	33.3	68	73	2900	30.4	37	4.7	1410	410
125GDL100-20×5	70	19.4	115	65	2900	33.7	45	4.2	1585	470
125GDL100-20×5	100	27.7	100	74	2900	36.8	45	4.5	1585	470
125GDL100-20×5	120	33.3	85	73	2900	38.1	45	4.7	1585	470
125GDL100-20×6	70	19.4	138	65	2900	40.5	55	4.2	1865	520
125GDL100-20×6	100	27.7	120	74	2900	44.2	55	4.5	1865	520
125GDL100-20×6	120	33.3	102	73	2900	45.7	55	4.7	1865	520
125GDL100-20×7	70	19.4	161	65	2900	47.2	75	4.2	1960	740
125GDL100-20×7	100	27.7	140	74	2900	51.5	75	4.5	1960	740
125GDL100-20×7	120	33.3	119	73	2900	53.3	75	4.7	1960	740
125GDL100-20×8	70	19.4	181	65	2900	54	75	4.2	2055	750
125GDL100-20×8	100	27.7	160	74	2900	58.9	75	4.5	2055	750
125GDL100-20×8	120	33.3	136	73	2900	60.9	75	4.7	2055	750
125GDL100-20×9	70	19.4	207	65	2900	60.7	75	4.2	2225	760
125GDL100-20×9	100	27.7	180	74	2900	66.3	75	4.5	2225	760
125GDL100-20×9	120	33.3	153	73	2900	68.5	75	4.7	2225	760
125GDL100-20×10	70	19.4	230	65	2900	67.5	90	4.2	2370	810
125GDL100-20×10	100	27.7	200	74	2900	73.6	90	4.5	2370	810
125GDL100-20×10	120	33.3	170	73	2900	76.1	90	4.7	2370	810
Model	Flow Rate		Head (m)	Efficiency (%)	Speed (r/min)	Power		NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
Model	(m3/h)	(L/s)	Head (m)	Efficiency (%)	Speed (r/min)	Shaft Power (kw)	Motor Power (kw)	NPSHr (m)	Pump Height(mm)	Pump Weight(kg)
150GDL160-20×2	112	31.1	46	69	2900	20.3	30	4.4	1325	384
150GDL160-20×2	160	44.4	40	78	2900	22.3	30	4.5	1325	384
150GDL160-20×2	192	53.3	34	77	2900	23.1	30	4.7	1325	384
150GDL160-20×3	112	31.1	69	69	2900	30.5	37	4.4	1420	416
150GDL160-20×3	160	44.4	60	78	2900	33.5	37	4.5	1420	416
150GDL160-20×3	192	53.3	51	77	2900	34.6	37	4.7	1420	416
150GDL160-20×4	112	31.1	92	69	2900	40.6	55	4.4	1705	577
150GDL160-20×4	160	44.4	80	78	2900	44.7	55	4.5	1705	577
150GDL160-20×4	192	53.3	68	77	2900	46.2	55	4.7	1705	577
150GDL160-20×5	112	31.1	115	69	2900	50.9	75	4.4	1875	736
150GDL160-20×5	160	44.4	100	78	2900	55.9	75	4.5	1875	736
150GDL160-20×5	192	53.3	85	77	2900	57.8	75	4.7	1875	736
150GDL160-20×6	112	31.1	138	69	2900	61	75	4.4	1970	703
150GDL160-20×6	160	44.4	120	78	2900	67.1	75	4.5	1970	703
150GDL160-20×6	192	53.3	102	77	2900	69.3	75	4.7	1970	703
150GDL160-20×7	112	31.1	161	69	2900	71.2	90	4.4	2115	798
150GDL160-20×7	160	44.4	140	78	2900	78.3	90	4.5	2115	798
150GDL160-20×7	192	53.3	119	77	2900	80.9	90	4.7	2115	798
150GDL160-20×8	112	31.1	184	69	2900	75.1	90	4.4	2400	809
150GDL160-20×8	160	44.4	160	78	2900	80.4	90	4.5	2400	809
150GDL160-20×8	192	53.3	136	77	2900	84.6	90	4.7	2400	809
150GDL160-20×9	112	31.1	207	69	2900	91.6	110	4.4	2495	1180
150GDL160-20×9	160	44.4	180	78	2900	100.6	110	4.5	2495	1180
150GDL160-20×9	192	53.3	153	77	2900	104	110	4.7	2495	1180
150GDL160-20×10	112	31.1	230	69	2900	101.7	132	4.4	2670	1311
150GDL160-20×10	160	44.4	200	78	2900	111.8	132	4.5	2670	1311
150GDL160-20×10	192	53.3	170	77	2900	115.5	132	4.7	2670	1311
150GDL160-25×2	112	31.1	56	68	2900	25.1	37	5	1330	394
150GDL160-25×2	160	44.4	50	77	2900	28.3	37	5	1330	394
150GDL160-25×2	192	53.3	44	76	2900	30.3	37	5	1330	394
150GDL160-25×3	112	31.1	84	68	2900	37.7	55	5	1580	566
150GDL160-25×3	160	44.4	75	77	2900	42.4	55	5	1580	566
150GDL160-25×3	192	53.3	66	76	2900	45.4	55	5	1580	566

Compliance & Certifications

National Standard Compliance: Strictly manufactured per JB/T 6435-92 “Technical Conditions for Multi-stage Centrifugal Pumps”. Hydraulic performance & mechanical safety 100% compliant. Full performance curve test reports from third parties available.
International Quality System: ISO 9001:2015 certified. Core pressure-bearing components evaluated per CE/PED 2014/68/EU, meeting EU/US market entry requirements.
Environmental & Material Certification: Wetted parts comply with RoHS/REACH directives. Stainless steel materials supplied with GB/T 3280/ASTM A240 certificates, ensuring zero heavy metal leaching risk.
Factory Inspection Standard: Every unit undergoes 1.5× rated pressure hydrostatic test (5-min hold) & G6.3 dynamic balance calibration, guaranteeing zero-vibration, zero-leakage delivery.

OEM & CUSTOM

Rapid Delivery for Standard Models: Covers mainstream flow & head ranges. Comes standard with IP55-rated, Class F insulated motors. Technical validation and sample prototyping completed within 72 hours.

Advanced Customization Capabilities: • Material Upgrades: Wetted parts available in 316L stainless steel, 2205 duplex steel, or titanium alloy, tailored for seawater and mild acidic/alkaline media. • Seals & Motors: Optional cartridge mechanical seals, explosion-proof motors (Ex d IIB T4), VFD-specific motors, or IE4 ultra-high-efficiency motors. • Structural Adaptation: Configurable inlet/outlet flanges (ANSI/DIN/JIS), reinforced base frames, and pre-installed anti-vibration flexible joints. • Smart Expansion: Pre-wired ports for pressure/temperature sensors, with seamless integration for PLC control panels and IoT remote monitoring.

Contact us for customization inquiries. Our engineering team will deliver hydraulic performance curves and 3D installation drawings within 48 hours.

Installation Guidelines

Pre-Installation Checks: Verify foundation flatness ≤2mm/m, maintain ≥500mm clearance around for maintenance. Confirm piping is clean & free of slag. Max system pressure <2.5 MPa (System Pressure = Inlet Pressure + Shut-off Head Pressure).
Installation Key Points:

Mount pump vertically. Inlet/outlet flanges must align naturally. Never use pump body to absorb pipe stress. Install flexible joints at inlet/outlet.

Inlet piping must ensure positive pressure priming or install a foot valve. Ensure pump chamber is fully filled before startup to prevent dry running.

Motor junction box faces outward. Secure cable along pipe wall. Grounding resistance ≤4Ω. Protection rating ≥IP55.

Before initial startup, manually rotate shaft 3 turns to confirm smooth operation. Jog test to verify rotation direction (clockwise from motor end).
Commissioning Process: Prime & vent → Jog test for direction → No-load run 5 min → Slowly open discharge valve to rated duty → Record current/pressure/vibration/temp rise Acceptance sign-off.
Request the “GDL Multi-stage Centrifugal Pump Installation & Maintenance Manual” (PDF/English version) for complete dimensional drawings, bolt torque tables, and commissioning logs.

FAQ

Q1: How to calculate actual system pressure for GDL pumps?

System Pressure = Inlet Pressure + Shut-off Head Pressure. Verify pipeline rating <2.5 MPa before operation; install safety/reducing valves if exceeded.

Q2: How to prevent pipe stress from causing shaft misalignment during inline installation?

Flanges must align naturally without forced fitting. Install 50–100mm flexible rubber joints at inlet/outlet to absorb thermal expansion & vibration stress.

Q3: What mechanical seal selection is required for media up to 80℃?

Standard seals suit ≤80℃. Upgrade to high-temperature cartridge seals (FKM O-rings + SiC mating faces) and ensure adequate pump chamber cooling to prevent vaporization/dry running.

Q4: How to prevent flow imbalance during multi-pump parallel operation?

Use identical pumps with independent VFDs. Install check valves & flow control valves on discharge headers. Implement “master-slave rotation + pressure PID closed-loop” control for dynamic load balancing.

Q5: What precautions are needed before startup at -15℃ low temperature?

Drain pump chamber or add antifreeze after shutdown. Replace bearing grease with low-temperature grade (-30℃). Manually rotate shaft to verify no ice binding before low-frequency soft start.

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