In recent years, in order to solve the problem of anti-corrosion of vacuum pump products, a long-term exploration and research has been carried out. Water ring vacuum pump is favored by the market because of its advantages of energy saving and wide corrosion resistance.
It is reported that the water ring vacuum pump has the advantages of good corrosion resistance, compact structure, energy saving, high efficiency and reliable operation because of its small proportion of materials, high strength and wide corrosion resistance. It solves the drawbacks of the original pump products and is suitable for pumping or pressing air, corrosive gas and slag water, organic and liquid without suspended particles or crystals. It is widely used in chemical industry. Industrial and pharmaceutical industries, such as vacuum suction, vacuum filtration, vacuum drying, vacuum concentration, vacuum evaporation, vacuum distillation, vacuum crystallization and plastic forming.
It is pointed out that, especially for by-product gases such as hydrogen chloride, which often occur in chemical and pharmaceutical enterprises, the use of corrosion-resistant water ring vacuum pump can effectively suck and compress these corrosive gases to form by-products such as hydrochloric acid with high concentration, which not only meets the requirements of environmental protection, but also forms a circular economy.
At present, there are many types of water ring vacuum pumps on the market, many customers reflect that they do not know how to select the type. To this end, the EVP vacuum pump manufacturer’s technicians gave four suggestions on the selection of water-ring vacuum pump, hoping to provide some reference for customers when purchasing water-ring vacuum pump.
1. Choose the specifications with lower rotational speed as far as possible.
It is understood that at present, there are many rotational speeds for the same specifications of water ring vacuum pumps in China. Among them, the larger size of the pump impeller diameter, so the speed is low, so in order to achieve the same pumping volume, we should try to choose the pump with lower speed, so that the consumption of specific power is smaller, higher efficiency.
In addition, the larger size of the water ring vacuum pump has a long blade, i.e. a long runner, a small curvature of the fluid, a straight streamline, a slow-changing flow, and a small energy loss due to the secondary eddy current and boundary layer generated in the flow of the fluid.
2. The influence of water temperature should be considered.
It is reported that the performance curves and technical data of domestic and foreign water ring vacuum pumps are obtained on the premise that the inlet water temperature is 15 degrees Celsius. Therefore, when selecting water ring vacuum pump, the effect of actual water temperature on gas flow should be fully considered.
According to the industry, the temperature of the supplementary water for most users in our country is between 25 35 C. Therefore, the selection of vacuum pumps should be more appropriate than the amount of air on the technical documents.
3. Consider the effect of inspiratory resistance
Because the gas suction location is often in the coal mine, far from the water ring vacuum pump (some coal mines reach several kilometers), and the suction pipeline is too long, the suction resistance loss should be fully considered. It can be calculated by the formula for calculating the suction resistance used in the coal mine system. When arranging the pipeline, the thicker suction pipeline should be used to reduce the resistance loss and the right angle elbow should be minimized. To achieve the purpose of improving the efficiency of inspiration.
4. Selection of Exhaust Gas with Micro-positive Pressure
It is reported that at present, some coal mines have to discharge the exhausted gas far away or compress it into the gas storage tank, and the exhaust pressure is generally between 0.02 and 0.05 MPa G. Because the performance curves and technical data in the technical documents of water ring vacuum pumps are obtained at the exhaust pressure of one standard atmospheric pressure, the influence of the increase of exhaust pressure and the increase of reflux in the pump chamber on the pumping capacity should be taken into account in the selection of the pumps.
In addition, as the exhaust pressure rises, the shaft power of the pump increases, and the power of the drive should also increase. In this case, the manufacturer should provide the test performance curve and the corresponding technical data in order to fully meet the user’s requirements.
2BV Series Liquid Ring Vacuum Pump
| Curve No. | Model | Max. suction capacity | Ultimate vacuum mbar(MPa) |
Motor power kW |
Speed r.p.m |
Operating liquidflow rate L/min |
Noise dB(A) |
Weight kg |
|
| m3/min | m3/h | ||||||||
| 60V | 2BV2-060 | 0.45 | 27 | 33mbar (-0.097MPa) |
0.81 | 2840 | 2.5 | 62 | 37 |
| 61V | 2BV2-061 | 0.86 | 52 | 1.45 | 2840 | 2.5 | 65 | 41 | |
| 70V | 2BV2-070 | 1.33 | 80 | 2.35 | 2860 | 3 | 66 | 66 | |
| 71V | 2BV2-071 | 1.83 | 110 | 3.85 | 2880 | 4.7 | 72 | 85 | |
| 110V | 2BV5-110 | 2.75 | 165 | 4 | 1440 | 7.2 | 63 | 120 | |
| 111V | 2BV5-111 | 3.83 | 230 | 5.5 | 1440 | 8.8 | 68 | 150 | |
| 121V | 2BV5-121 | 4.66 | 280 | 7.5 | 1440 | 11 | 69 | 210 | |
| 131V | 2BV5-131 | 6.66 | 400 | 11 | 1460 | 16 | 73 | 280 | |
| 161V | 2BV5-161 | 8.33 | 500 | 15 | 970 | 22 | 74 | 390 | |
| 110V | 2BV6-110 | 2.75 | 165 | 4 | 1440 | 67 | 63 | 150 | |
| 111V | 2BV6-111 | 3.83 | 230 | 5.5 | 1440 | 10 | 68 | 200 | |
| 121V | 2BV6-121 | 4.66 | 280 | 7.5 | 1440 | 12 | 69 | 230 | |
| 131V | 2BV6-131 | 6.66 | 400 | 11 | 1460 | 17 | 73 | 315 | |
| 161V | 2BV6-161 | 8.33 | 500 | 15 | 970 | 23 | 74 | 426 | |
2SK Liquid Ring Vacuum Pump
| Model | Suction capacity | Ultimate vacuum | Power | speed | Water supply | Inlet/outlet diam | Water inlet |
| m³/min | MPa（G） | KW | r/min | L/min | DN(mm） | (mm) | |
| 2SK1.5 | 1.35 | -0.097 | 4 | 1440 | 10-15 | 40 | G1/2” |
| 2SK-3 | 2.7 | -0.098 | 7.5/11 | 1440 | 15-20 | 40 | G1/2” |
| 2SK-6 | 5.4 | -0.098 | 15 | 1460 | 25-35 | 65 | G1/2” |
| 2SK-12 | 10.8 | -0.098 | 22/30 | 970 | 40-50 | 100 | G1/2” |
| 2SK-20 | 18 | -0.098 | 45 | 740 | 60-80 | 125 | G3/4” |
| 2SK-30 | 27 | -0.098 | 55/75 | 740 | 70-90 | 125 | G3/4” |
2BE1 Series Liquid Ring Vacuum Pump
| Model | Speed(Driving mode) | Shaft power | Motor power | Ultimatevacuum | Max. capacity | Weight (excl.motor) | |
| r/min | KW | 380V | hpa | M³/hr | M³/min | kg | |
| 2BE1-102 | 1450 (direct)1750 (V-belt) | 6.08.0 | Y132M-4-7.5Y160M-4-11 | 33hpa(-0.097MPa) | 246290 | 4.14.8 | 110 |
| 2BE1-103 | 1450 (direct)1750 (V-belt) | 8.211.1 | Y160M-4-11Y160L-4-15 | 33hpa(-0.097MPa) | 340412 | 5.76.9 | 125 |
| 2BE1-152 | 1450 (direct)1625 (V-belt)
1750 (V-belt) |
12.515.0
17.2 |
Y160L-4-15Y180M-4-18.5
Y180L-4-22 |
33hpa(-0.097MPa) | 450510
535 |
7.58.5
8.9 |
175 |
| 2BE1-153 | 1450 (direct)1100 (V-belt)
1300 (V-belt) 1620 (V-belt) 1750 (V-belt) |
16.310.6
13.4 19.6 22.3 |
Y180M-4-18.5Y160L-4-15
Y180M-4-18.5 Y180L-4-22 Y200L-4-30 |
33hpa(-0.097MPa) | 600445
535 648 700 |
10.07.4
8.9 10.8 11.7 |
200 |
| 2BE1-202 | 980 (direct)790 (V-belt)
880 (V-belt) 1100 (V-belt) 1170 (V-belt) 1300 (V-belt) |
18.213.4
16.3 23.8 25.7 30 |
Y200L2-6-22Y180M-4-18.5
Y180M-4-18.5 Y200L-4-30 Y200L-4-30 Y225S-4-37 |
33hpa(-0.097MPa) | 750590
670 860 888 950 |
12.59.8
11.2 14.3 14.8 15.8 |
460 |
| 2BE1-203 | 980 (direct)790 (V-belt)
880 (V-belt) 1100 (V-belt) 1170 (V-belt) 1300 (V-belt) |
29.521.2
24.8 34 38 42 |
Y250M-6-37Y200L-4-30
Y200L-4-30 Y225M-4-45 Y225M-4-45 Y250M-4-55 |
33hpa(-0.097MPa) | 1080870
980 1210 1320 1390 |
1814.5
16.3 20.2 22.0 23.2 |
530 |
| 2BE1-252 | 740 (direct)565 (V-belt)
660 (V-belt) 830 (V-belt) 885 (V-belt) 938 (V-belt) |
3823.7
31.8 45 54 60 |
Y280M-8-45Y200L-4-30
Y225S-4-37 Y250M-4-55 Y280S-4-75 Y280S-4-75 |
33hpa(-0.097MPa) | 17001200
1500 1770 2000 2100 |
28.320.0
25.0 29.5 33.3 35.0 |
870 |
| 2BE1-253 | 740 (direct)565 (V-belt)
660 (V-belt) 740 (V-belt) 792 (V-belt) 820 (V-belt) 880 (V-belt) 940 (V-belt) |
5437.2
45 50.8 60 68 75.1 88 |
Y315M-8-75Y225M-4-45
Y250M-4-55 Y280S-4-75 Y280S-4-75 Y280M-4-75 Y280M-4-90 Y315S-4-110 |
33hpa(-0.097MPa) | 24501690
2100 2340 2560 2640 2780 3050 |
40.828.2
35 39 42.7 44 46.3 50.8 |
930 |
| 2BE1-303 | 740 (direct)590 (direct)
466 (V-belt) 530 (V-belt) 583 (V-belt) 660 (V-belt) 740 (V-belt) |
9865.5
48 58 64 79.8 96 |
Y315L2-8-110Y315L2-10-75
Y250M-4-55 Y280S-4-75 Y280S-4-75 Y280M-4-90 Y315S-4-110 |
33hpa(-0.097MPa) | 40003200
2520 2820 3100 3550 3840 |
66.753.3
42 47 51.7 59.2 64 |
1700 |
| 2BE1-305 | 740 (direct)590 (direct)
490 (V-belt) 530 (V-belt) 583 (V-belt) 660 (V-belt) 740 (V-belt) |
10870
55 61 68 90 110 |
Y355M1-8-132Y355M1-10-90
Y280S-4-75 Y280S-4-75 Y280M-4-90 Y315S-4-110 Y315M-4-132 |
33hpa(-0.097MPa) | 45203750
3150 3380 3700 4090 4550 |
75.362.5
52.5 56.4 61.2 68.1 75.8 |
1820 |
| 2BE1-353 | 590 (direct)390 (V-belt)
425 (V-belt) 464 (V-belt) 530 (V-belt) 560 (V-belt) 620 (V-belt) 660 (V-belt) |
12163
72 85 95 110 133 152 |
Y355L2-10-160Y280S-4-75
Y280M-4-90 Y315S-4-110 Y315M-4-110 Y315L1-4-132 Y315L1-4-160 Y315L2-4-185 |
33hpa(-0.097MPa) | 53003580
3700 4100 4620 5000 5500 5850 |
88.359.7
61.7 68.3 77.0 83.3 91.7 97.5 |
2300 |
| 2BE1-355 | 590 (direct)390 (V-belt)
420 (V-belt) 464 (V-belt) 523 (V-belt) 590 (V-belt) 660 (V-belt) |
13675
80.8 95 113 136 182 |
Y355L2-10-160Y280M-4-90
Y280-4-90 Y315S-4-110 Y315M-4-132 Y315L1-4-160 Y315L2-4-200 |
33hpa(-0.097MPa) | 57004180
4260 4850 5230 6000 6510 |
9569.7
71 80.8 87.1 100 108 |
2450 |
| 2BE1-403 | 330 (V-belt)372 (V-belt)
420 (V-belt) 472 (V-belt) 530 (V-belt) |
98110
131 160 213 |
Y315M-4-132Y315M-4-132
Y315L1-4-160 Y315L2-4-200 Y355M2-4-250 |
33hpa(-0.097MPa) | 48605400 6470
7380 8100 |
8190
107.8 123.0 135.0 |
3750 |
| 2BE1-405 | 330 (V-belt)372 (V-belt)
420 (V-belt) 472 (V-belt) 530 (V-belt) |
100118
140 170 216 |
Y315M-4-132Y315L1-4-160
Y315L2-4-185 Y315L2-4-200 Y355M2-4-250 |
33hpa(-0.097MPa) | 60006700
7500 8350 9450 |
100.0111.7
125.0 139.2 157.5 |
3900 |
DLV Series Double Stages Water Ring Vacuum Pumps
| Model | Motorspeed | Motor power | Max. suction capacity | Min. inlet pressure | |||
| kw | HP | m3/h | CFM | mbar | Inch Hg a | ||
| DLV-120 | 1450 | 4.0 | 5.4 | 145 | 85 | 33 | 1.0 |
| 1750 | 5.5 | 7.4 | 174 | 102 | 33 | 1.0 | |
| DLV-180 | 1450 | 5.5 | 7.4 | 186 | 109 | 33 | 1.0 |
| 1750 | 7.5 | 10.1 | 223 | 131 | 33 | 1.0 | |
| DLV-300 | 1450 | 7.5 | 10.1 | 283 | 167 | 33 | 1.0 |
| 1750 | 11.0 | 14.8 | 314 | 185 | 33 | 1.0 | |
| DLV-350 | 1450 | 11.0 | 14.8 | 342 | 201 | 33 | 1.0 |
| 1750 | 15.0 | 20.1 | 411 | 242 | 33 | 1.0 | |
| DLV-400 | 1450 | 15.0 | 20.1 | 425 | 250 | 33 | 1.0 |
| 1750 | 18.5 | 24.8 | 475 | 280 | 33 | 1.0 | |
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