Model :
DS-77Type :
Plunger PumpStroke :
3.0 Inches / 76.2 mmCylinder Diameter :
22-76mmFlow :
8.7-522.3LPM/2.3-138GPMPressure :
6-69MPaShipping Port :
Shanghai Port, ChinaWarranty :
12 MonthsSpecifications:
| Design Standard | API-674, Third Edition |
| Configuration | Horizontal Triplex Plunger |
| Number of Plungers | 3 |
| Continuous Duty | 62 BHP |
| Intermittent Duty | 77 BHP |
| Stroke Length | 3.0 Inches / 76.2 mm |
| Frame Load Rating | 6,000 lbs / 2721.6 kg |
| Pump Weight (Average) | 950 lbs / 430.92 kg |
| Intermittent Duty Speed Rating | 500 RPM |
| Continuous Duty Speed Rating | 400 RPM |
| Minimum Speed | 100 RPM |
| Mechanical Efficiency | 90% |
| Lubrication System | Splash, Gravity Return |
| Lubrication System (Optional) | 3.25 Gallons / 12.0 L |
| Lube Oil Type | SAE30 |
| Fluid Temperature Range | -20~350°F/-28~176°C |
| Valve Type | Disc Valve / Wear-resistant Valve |
Performance Data (Metric):
| Pump Model |
Plunger Diameter (mm) |
Displacement (L/REV) |
Maximum Pressure (MPa) |
Pump Capacity (LPM)@Input Speed (RPM) | ||||||
| 100 | 200 | 300 | 350 | 400 | 450 | 500 | ||||
| DS7707 | 22 | 0.0886 | 69 | 8.7 | 17.8 | 26.5 | 31.0 | 35.6 | 39.7 | 44.3 |
| DS7708 | 25 | 0.1158 | 52 | 11.7 | 23.1 | 34.8 | 40.5 | 46.2 | 52.2 | 57.9 |
| DS7710 | 32 | 0.1809 | 34 | 18.2 | 36.3 | 54.1 | 63.2 | 72.3 | 81.4 | 90.5 |
| DS7712 | 38 | 0.2604 | 23 | 26.1 | 52.2 | 78 | 91.2 | 104.1 | 117.3 | 130.2 |
| DS7714 | 44 | 0.3547 | 17 | 35.6 | 70.8 | 106.4 | 124.1 | 141.9 | 159.7 | 177.5 |
| DS7716 | 51 | 0.4633 | 13 | 46.2 | 92.7 | 138.9 | 162 | 185.5 | 208.6 | 231.6 |
| DS7718 | 57 | 0.5863 | 10 | 58.7 | 117.3 | 176.0 | 205.1 | 234.7 | 263.8 | 293.3 |
| DS7720 | 64 | 0.7237 | 9 | 72.3 | 144.6 | 217.3 | 253.2 | 289.6 | 325.5 | 361.8 |
| DS7722 | 70 | 0.8758 | 7 | 87.4 | 175.2 | 262.7 | 306.6 | 350.5 | 393.6 | 439.1 |
| DS7724 | 76 | 1.0424 | 6 | 104.1 | 208.6 | 312.6 | 364.9 | 416.4 | 469.3 | 522.3 |
Performance Data:
| Pump Model |
Plunger Diameter (in) |
Displacement (GAL/REV) |
Maximum Pressure (PSI) |
Pump Capacity (GPM)@Input Speed (RPM) | ||||||
| 100 | 200 | 300 | 350 | 400 | 450 | 500 | ||||
| DS7707 | 0.875 | 0.0234 | 10,000 | 2.3 | 4.7 | 7 | 8.2 | 9.4 | 10.5 | 11.7 |
| DS7708 | 1 | 0.0306 | 7,600 | 3.1 | 6.1 | 9.2 | 10.7 | 12.2 | 13.8 | 15.3 |
| DS7710 | 1.25 | 0.0478 | 4,900 | 4.8 | 9.6 | 14.3 | 16.7 | 19.1 | 21.5 | 23.9 |
| DS7712 | 1.5 | 0.0688 | 3,400 | 6.9 | 13.8 | 20.6 | 24.1 | 27.5 | 31 | 34.4 |
| DS7714 | 1.75 | 0.0937 | 2,500 | 9.4 | 18.7 | 28.1 | 32.8 | 37.5 | 42.2 | 46.9 |
| DS7716 | 2 | 0.1224 | 1,900 | 12.2 | 24.5 | 36.7 | 42.8 | 49 | 55.1 | 61.2 |
| DS7718 | 2.25 | 0.1549 | 1,500 | 15.5 | 31 | 46.5 | 54.2 | 62 | 69.7 | 77.5 |
| DS7720 | 2.5 | 0.1912 | 1,250 | 19.1 | 38.2 | 57.4 | 66.9 | 76.5 | 86 | 95.6 |
| DS7722 | 2.75 | 0.2314 | 1,000 | 23.1 | 46.3 | 69.4 | 81 | 92.6 | 104 | 116 |
| DS7724 | 3 | 0.2754 | 850 | 27.5 | 55.1 | 82.6 | 96.4 | 110 | 124 | 138 |
Standard connection sizes:
| Pump Model | Suction (in) | Discharge (in) |
| DS7707-DS7711 | 2.0 | 1.0 |
| DS7709-DS7716 | 3.0 | 1.5 |
| DS7712-DS7726 | 3.0 | 2.0 |
Fluid cylinder materials:
| Fluid cylinder materials | Cast |
| Carbon Steel | Ductile Iron |
| Hi-Strength Carbon Alloy Steel | Aluminum Bronze |
| 304 / 316L / 17-4PH / 2205 / 2507 Stainless Steel | |
*Special materials are available upon request

Engineering dimensional outline

Advantages
The advantages of reverse osmosis pumps lie in their versatility and adaptability. First, they can flexibly handle varying water quality conditions, performing excellently whether treating sources with high concentrations of dissolved solids or relatively clean tap water. Second, its compact structure occupies minimal space, making it ideal for installation in equipment with limited room, such as household water purifiers or small commercial systems. Additionally, reverse osmosis pumps are simple to operate, requiring no complex training for users to master their use. Maintenance costs are also low, thanks to durable materials and modular design, which make replacing parts both convenient and economical. Finally, the pump's environmental credentials are noteworthy. Its high energy efficiency ratio and wastewater reduction design make it a vital component in sustainable water treatment solutions. Collectively, these advantages make reverse osmosis pumps highly favored across diverse application scenarios.
Core Function
The reverse osmosis pump serves as the “heart” of a reverse osmosis water purification system, playing a crucial role throughout the entire purification process. This specially designed pump generates a continuous, stable high-pressure water flow, providing the necessary driving force for the reverse osmosis process. Its core function lies in producing sufficient water pressure to effectively propel the feedwater across the surface of the reverse osmosis membrane at a specific flow rate. During this process, the high-pressure water flow forces water molecules through the membrane's microscopic pores, while impurities such as dissolved solids and heavy metal ions are blocked by the membrane. This achieves deep purification of the water, producing purified water that meets drinking standards. It can be said that the performance of the reverse osmosis pump directly determines the filtration efficiency and output water quality of the entire purification system.