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MPS pu rod seal is designed for high pressure single acting u cup rod seal，also as hydraulic cylinder piston cup seals .Made by PU material and NBR square ring.it is one type of pu rod seal.
HBY Seal Design Description：
The main functions of the buffer seal in the hydraulic system include several aspects. First, it buffers the shock pressure or pressure fluctuations produced by the piston rod of the hydraulic cylinder, easing the backpressure. Second, the buffer seal hydraulic cylinder helps cooling down the temperature, prevents the overheat from transmitting to the seal, and reducing heat generated from the piston rod seal during operation. Third, hydraulic buffer seal reduces the friction resistance caused by the piston rod seal in the hydraulic cylinder. In general, the buffer seal provides adequate lubrication to the piston rod seal or other main seals, and it can enhance the gap extrusion resistance. Thereby, it can extend the durability of the seal element.
| d | D | h | H |
| 40 | 55.5 | 6 | 6.3 |
| 45 | 60.5 | 6 | 6.3 |
| 50 | 65.5 | 6 | 6.3 |
| 55 | 70.5 | 6 | 6.3 |
| 60 | 75.5 | 6 | 6.3 |
| 65 | 80.5 | 6 | 6.3 |
| 70 | 85.5 | 6 | 6.3 |
| 75 | 90.5 | 6 | 6.3 |
| 80 | 95.5 | 6 | 6.3 |
| 85 | 100.5 | 6 | 6.3 |
| 90 | 105.5 | 6 | 6.3 |
| 95 | 110.5 | 6 | 6.3 |
| 100 | 115.5 | 6 | 6.3 |
| d | D | h | H |
| 105 | 120.5 | 6 | 6.3 |
| 110 | 125.5 | 6 | 6.3 |
| 115 | 130.5 | 6 | 6.3 |
| 120 | 135.5 | 6 | 6.3 |
| 125 | 140.5 | 6 | 6.3 |
| 130 | 145.5 | 6 | 6.3 |
| 135 | 150.5 | 6 | 6.3 |
| 140 | 155.5 | 6 | 6.3 |
| 145 | 160.5 | 6 | 6.3 |
| 150 | 165.5 | 6 | 6.3 |
| 160 | 175.5 | 6 | 6.3 |
| 170 | 185.5 | 6 | 6.3 |
| 180 | 195.5 | 6 | 6.3 |
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