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The PG-type piston seals is a double-acting sealing component consisting of a preloaded elastomeric O-ring and a specially designed polyurethane sealing outer ring.
Design Description:
PG is polyurethane/PU piston seal,The two outer sealing lips serve as the main seals, effectively containing the pressure of the fluid from both sides while preventing hydraulic pressure buildup across the entire sealing surface. The support ring located in the middle of the sealing surface, along with the raised edges of the sealing lips, enhances the sealing effect by increasing the contact pressure.
The advantages of the PG Piston Seal include:
Excellent dynamic and static sealing performance, ensuring reliable position retention under load.
Allows for a wide range of cylinder bore surface finishes.
Low wear rate and long service life.
Simple groove design, allowing for the use of integral pistons without the need for outer ring reset during installation.
| Pressure （Mpa） | 16 | 25 | 35 | 40 |
| Maximum extrusion gap（H>6）mm | 0.9 | 0.8 | 0.5 | 0.4 |
| Maximum extrusion gap（H<6）mm | 0.7 | 0.5 | 0.3 | 0.2 |
| CODE | D | d | H |
| PG | 40 | 29 | 4.2 |
| PG | 45 | 34 | 4.2 |
| PG | 50 | 39 | 4.2 |
| PG | 60 | 49 | 4.2 |
| PG | 63 | 52 | 4.2 |
| PG | 70 | 59 | 4.2 |
| PG | 50 | 34.5 | 6.3 |
| PG | 55 | 39.5 | 6.3 |
| PG | 60 | 44.5 | 6.3 |
| PG | 65 | 49.5 | 6.3 |
| PG | 70 | 54.5 | 6.3 |
| PG | 75 | 59.5 | 6.3 |
| PG | 80 | 64.5 | 6.3 |
| PG | 85 | 69.5 | 6.3 |
| PG | 90 | 74.5 | 6.3 |
| PG | 95 | 79.5 | 6.3 |
| PG | 100 | 84.5 | 6.3 |
| PG | 105 | 89.5 | 6.3 |
| PG | 110 | 94.5 | 6.3 |
| PG | 115 | 99.5 | 6.3 |
| PG | 120 | 104.5 | 6.3 |
| PG | 125 | 109.5 | 6.3 |
| PG | 130 | 114.5 | 6.3 |
| CODE | D | d | H |
| PG | 85 | 64 | 8.1 |
| PG | 90 | 69 | 8.1 |
| PG | 95 | 74 | 8.1 |
| PG | 100 | 79 | 8.1 |
| PG | 105 | 84 | 8.1 |
| PG | 110 | 89 | 8.1 |
| PG | 115 | 94 | 8.1 |
| PG | 120 | 99 | 8.1 |
| PG | 125 | 104 | 8.1 |
| PG | 130 | 109 | 8.1 |
| PG | 135 | 114 | 8.1 |
| PG | 140 | 119 | 8.1 |
| PG | 145 | 124 | 8.1 |
| PG | 150 | 129 | 8.1 |
| PG | 155 | 134 | 8.1 |
| PG | 160 | 139 | 8.1 |
| PG | 165 | 144 | 8.1 |
| PG | 170 | 149 | 8.1 |
| PG | 180 | 159 | 8.1 |
| PG | 190 | 169 | 8.1 |
| PG | 200 | 179 | 8.1 |
| PG | 210 | 189 | 8.1 |
| PG | 220 | 199 | 8.1 |
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