离心泵有立式、卧式、单级、多级、单吸、双吸、自吸式等多种形式。其主要的工作原理有：离心是物体惯性的表现。比如雨伞上的水滴，当雨伞缓慢转动时，水滴会跟随雨伞转动，这是因为雨伞与水滴的摩擦力做为给水滴的向心力使然。但是如果雨伞转动加快，这个摩擦力不足以使水滴在做圆周运动，那么水滴将脱离雨伞向外缘运动。就象用一根绳子拉着石块做圆周运动，如果速度太快，绳子将会断开，石块将会飞出。这个就是所谓的离心离心泵就是根据这个原理设计的。高速旋转的叶轮叶片带动水转动，将水甩出，从而达到输送的目的。
S、SH型单级双吸水平中开式离心泵。该型泵吸入口和排出口均在泵轴心线下方，检修时，只要将泵盖揭开，即可将全部零件拆下进行维修。S、SH型泵主要由泵体、泵盖、轴、叶轮、密封环、轴套、轴承部件等组成。其性能符合JB/1050-93《单吸双吸清水离心泵型式与基本参数》标准。
主要用于输送不含固体颗粒的清水或物理化学性质类似水的其它液体。适用于工业和城市给排水、农田排灌。
型号意义：
250 — S — 24 A 10SH---13A
250 — 泵吸入口直径 10泵吸入口直径（英寸）
S—单级双吸水平中开式离心清水泵 SH单级双吸离心清水泵
24—设计点扬程（m） 13泵的比转数除以10的整数值
三、详细性能
型号 | 流量(m3/h) | 扬程(m) | 转速(r/min) | 功率(%) | 效率率(%) | 汽蚀余量(m) | 备注(老型号) |
150S-78 | 160 | 78 | 2950 | 55 | 74 | 4.5 | 6sh-6 |
150S-78A | 140 | 60 | 2950 | 45 | 72 | 4.5 | 6sh-6A |
150S-50 | 160 | 50 | 2950 | 37 | 79 | 4.5 | 6sh-9 |
150S-50A | 140 | 39 | 2950 | 30 | 75 | 4.5 | 6sh-9A |
150S-50B | 133 | 36 | 2950 | 22 | 70 | 4.5 | 6sh-9B |
200S-95 | 280 | 95 | 2950 | 110 | 77 | 5 | 8sh-6 |
200S-95A | 268 | 87 | 2950 | 90 | 75 | 5 | 8sh-6A |
200S-95B | 245 | 72 | 2950 | 75 | 74 | 5 | 8sh-6B |
200S-63 | 280 | 63 | 2950 | 75 | 81 | 5 | 8sh-9 |
200S-63A | 270 | 46 | 2950 | 55 | 77 | 5 | 8sh-9A |
200S-42 | 280 | 42 | 2950 | 45 | 85 | 5 | 8sh-13 |
200S-42A | 270 | 46 | 2950 | 37 | 80 | 5 | 8sh-13A |
250S-65 | 485 | 42 | 1450 | 132 | 79 | 3.8 | 10sh-6 |
250S-65A | 468 | 36 | 1450 | 90 | 77 | 3.8 | 10sh-6A |
250S-39 | 485 | 65 | 1450 | 75 | 83 | 3.8 | 10sh-9 |
250S-39A | 468 | 54 | 1450 | 55 | 78 | 3.8 | 10sh-9A |
250S-24 | 486 | 39 | 1450 | 45 | 86 | 3.8 | 10sh-13 |
250S-24A | 414 | 30 | 1450 | 37 | 83 | 3.8 | 10sh-13A |
250S-14 | 485 | 24 | 1450 | 30 | 85 | 3.8 | 10sh-19 |
250S-14A | 432 | 20 | 1450 | 22 | 81 | 3.8 | 10sh-19A |
300S-90 | 790 | 14 | 1450 | 315 | 80 | 4.8 | 12sh-6 |
300S-90A | 756 | 11 | 1450 | 280 | 74 | 4.8 | 12sh-6A |
300S-90B | 720 | 90 | 1450 | 220 | 73 | 4.8 | 12sh-6B |
300S-58 | 790 | 78 | 1450 | 180 | 84 | 4.8 | 12sh-9 |
300S-58A | 720 | 67 | 1450 | 155 | 82 | 4.8 | 12sh-9A |
300S-58B | 685 | 58 | 1450 | 132 | 80 | 4.8 | 12sh-9B |
300S-32 | 790 | 50 | 1450 | 90 | 87 | 4.8 | 12sh-13 |
300S-32A | 700 | 43 | 1450 | 75 | 84 | 4.8 | 12sh-13A |
300S-19 | 790 | 32 | 1450 | 55 | 87 | 4.8 | 12sh-19 |
300S-19A | 700 | 26 | 1450 | 45 | 82 | 4.8 | 12sh-19A |
300S-12 | 790 | 19 | 1450 | 37 | 83 | 4.8 | 12sh-28 |
300S-12A | 700 | 15 | 1450 | 30 | 79 | 4.8 | 12sh-28A |
350S-125 | 1260 | 125 | 1450 | 680 | 81 | 5.5 | 14sh-6 |
350S-125A | 1181 | 112 | 1450 | 570 | 78 | 5.5 | 14sh-6A |
350S-125B | 1098 | 96 | 1450 | 500 | 77 | 5.5 | 14sh-6B |
350S-75 | 1260 | 75 | 1450 | 360 | 85 | 5.5 | 14sh-9 |
350S-75A | 1170 | 65 | 1450 | 280 | 84 | 5.5 | 14sh-9A |
350S-75B | 1080 | 55 | 1450 | 220 | 82 | 5.5 | 14sh-9B |
350S-44 | 1260 | 44 | 1450 | 220 | 87 | 5.5 | 14sh-13 |
350S-44A | 1116 | 36 | 1450 | 160 | 84 | 5.5 | 14sh-13A |
350S-26 | 1260 | 26 | 1450 | 110 | 88 | 5.5 | 14sh-19 |
350S-26A | 1130 | 21 | 1450 | 90 | 83 | 5.5 | 14sh-19A |
350S-16 | 1260 | 16 | 1450 | 75 | 86 | 5.5 | 14sh-28 |
350S-16A | 1130 | 12 | 1450 | 55 | 81 | 5.5 | 14sh-28A |
500S-98 | 2020 | 98 | 970 | 780 | 79.5 | 6 | 20sh-6 |
500S-98A | 1872 | 83 | 970 | 650 | 78.5 | 6 | 20sh-6A |
500S-98B | 1746 | 74 | 970 | 550 | 78 | 6 | 20sh-6B |
500S-59 | 2020 | 59 | 970 | 460 | 83 | 6 | 20sh-9 |
500S-59A | 1872 | 49 | 970 | 380 | 75 | 6 | 20sh-9A |
500S-59B | 1746 | 40 | 970 | 310 | 74 | 6 | 20sh-9B |
500S-35 | 2020 | 35 | 970 | 280 | 88 | 6 | 20sh-13 |
500S-35A | 1746 | 27 | 970 | 215 | 85 | 6 | 20sh-13A |
500S-22 | 2020 | 22 | 970 | 185 | 84 | 6 | 20sh-19 |
500S-22A | 1746 | 17 | 970 | 130 | 80 | 6 | 20sh-19A |
500S-13 | 2020 | 13 | 970 | 115 | 83 | 6 | 20sh-28 |
600S-75 | 3170 | 75 | 970 | 850 | 85 | 8.7 | 24sh-9 |
600S-75A | 2880 | 62 | 970 | 780 | 80 | 7.5 | 24sh-9A |
600S-47 | 3170 | 47 | 970 | 550 | 88 | 7.5 | 24sh-13 |
600S-32 | 3170 | 32 | 970 | 380 | 88 | 7.5 | 24sh-19 |
600S-32A | 2880 | 27 | 970 | 280 | 86 | 7.5 | 24sh-19A |
600S-32B | 2680 | 22 | 970 | 240 | 84 | 7.5 | 24sh-19B |
600S-22 | 3170 | 22 | 970 | 250 | 88 | 7 | 24sh-28 |
600S-22A | 2880 | 18 | 970 | 185 | 87 | 7 | 24sh-28A |
800S-32 | 5500 | 32 | 970 | 700 | 84 | 6.5 | 32sh-19 |
800S-32A | 5310 | 29 | 970 | 570 | 84 | 6.5 | 32sh-19A |