Long-stroke pumping units feature extended stroke lengths, low stroke frequencies, and high load-bearing capacities. Their specially designed mechanical rotary chains provide unique capabilities for heavy-duty lifting, heavy oil extraction, and deep-well
| No. | Model | Max. Polished Rod Load, t | Reducer Torque, kN·m | Frequency | Stroke Length, m |
| 1 | ER500 | 8 | 13 | Very slow-5SPM | 4.5 |
| 2 | ER500A | 8 | 13 | Very slow-3.2SPM | 8 |
| 3 | ER600 | 10 | 18 | Very slow-5.1SPM | 5 |
| 4 | ER600A | 10 | 13 | Very slow-5SPM | 3 |
| 5 | ER700 | 12 | 26 | Very slow-4SPM | 6 |
| 6 | ER700S | 11.2 | 18 | Very slow-4SPM | 6 |
| 7 | ER800 | 14 | 26 | Very slow-3.7SPM | 7 |
| 8 | ER800E | 14 | 26 | Very slow-3.4SPM | 8 |
| 9 | ER900 | 16.31 | 37 | Very slow-34.3SPM | 7.3 |
| 10 | ER1000 | 20 | 37 | Very slow-3.9SPM | 8 |
| 11 | ER1150 | 22.7 | 37 | Very slow-4.1SPM | 7.8 |
| 12 | ER1500 | 27.2 | 53 | Very slow-4.1SPM | 7.8 |
Long-stroke pumping units feature extended stroke lengths, low stroke frequencies, and high load-bearing capacities. Their specially designed mechanical rotary chains provide unique capabilities for heavy-duty lifting, heavy oil extraction, and deep-well pumping with small pumps, supporting maximum loads of 22.7 tons (50,000 lbs) and maximum stroke lengths of 9.3 meters (366 inches). Belt-driven long-stroke pumping units are gaining increasing popularity and widespread application due to their high efficiency, energy savings, environmental friendliness, and durability.
Long strokes achieve high pump filling coefficients and high system efficiency; low stroke rates effectively reduce fatigue and wear on underground equipment, extending maintenance-free periods and lowering operating costs; pure mechanical transmission ensures smooth reversing; Heavy-duty wide belts transmit power under high loads with extended service life; their elastic buffering reduces reversing impacts for smoother underground equipment operation; Foldable structure facilitates installation and transportation; Balance adjustment is convenient and straightforward; High reliability minimizes frequent maintenance. Features include a comprehensive lubrication system, reliable braking system, and fully enclosed design, eliminating the need for frequent servicing.
