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Piston Seals
Sealing ring: F-PTFE
Expansion ring: NBR
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Application Range
OK-type piston seals are mainly used for heavy-duty hydraulic equipment, which are especially applicable for double-acting piston. The applicable working pressure of such seals is up to 50MPa and can be higher under some circumstances.
Please refer to standards of OK series of Parker Company when designing and selecting.
Features
Small shape
Impact resistance load
High abrasion resistance
Apply to the grooves conforming to the international standards of ISO 7425-1
The friction of both start and motion is very low even after long time pressing
Since the sealing ring of the hydraulic cylinder is in open-type structure, it is easy to be installed on the integral piston without using any auxiliary tools
Owing to its special material performance, the sealing ring of the hydraulic cylinder possesses strong anti- extrusion capability under high pressure and big clearance.
Working Conditions
| Speed | Pressure Range | Temperature Range | Media | AvailableDiameter Range |
| 1m/s | 0~50MPa | -30℃ +110℃ | Hydraulic oil, water and emulsified liquids | 25-1000mm |
Specification Table
| Order No. | DH9 | dh9 | L+0.2 | D₁ |
| MAIS-22-25 | 25 | 16 | 4.2 | 24.3 |
| MAIS-22-32 | 32 | 21 | 4.2 | 31.3 |
| MAIS-22-40 | 40 | 29 | 4.2 | 39.3 |
| MAIS-22-40/1 | 40 | 26.3 | 5.8 | 39.3 |
| MAIS-22-50 | 50 | 34.5 | 6.3 | 49 |
| MAIS-22-50/1 | 50 | 39 | 4.2 | 49.3 |
| MAIS-22-60 | 60 | 41.7 | 7 | 59.2 |
| MAIS-22-60/1 | 60 | 49 | 4.2 | 59.3 |
| MAIS-22-63 | 63 | 44.7 | 7 | 62.2 |
| MAIS-22-63/1 | 63 | 47.5 | 6.3 | 62 |
| MAIS-22-70 | 70 | 51.7 | 7 | 69.2 |
| MAIS-22-70/1 | 70 | 59 | 4.2 | 69.3 |
| MAIS-22-75 | 75 | 54 | 8 | 74.2 |
| MAIS-22-125 | 125 | 104 | 8 | 123.8 |
| MAIS-22-125/1 | 125 | 109.5 | 6.3 | 124 |
| MAIS-22-130 | 130 | 109 | 8 | 128.8 |
| MAIS-22-135 | 135 | 119.5 | 6.3 | 134 |
| MAIS-22-135/1 | 135 | 114 | 8 | 133.8 |
| MAIS-22-140 | 140 | 119 | 8 | 138.8 |
| MAIS-22-145 | 145 | 124 | 8 | 143.8 |
| MAIS-22-150 | 150 | 129 | 8 | 148.8 |
| MAIS-22-160 | 160 | 139 | 8 | 158.8 |
| MAIS-22-165 | 165 | 144 | 8 | 163.8 |
| MAIS-22-170 | 170 | 149 | 8 | 168.8 |
| MAIS-22-175 | 175 | 154 | 8 | 173.8 |
| MAIS-22-180 | 180 | 159 | 8 | 178.8 |
| MAIS-22-190 | 190 | 169 | 8 | 188.8 |
| MAIS-22-200 | 200 | 179 | 8 | 198.8 |
| MAIS-22-210 | 210 | 189 | 8 | 208.4 |
| Order No. | DH9 | dh9 | L+0.2 | D₁ |
| MAIS-22-80 | 80 | 59 | 8 | 79 |
| MAIS-22-80/1 | 80 | 64.5 | 6.3 | 79 |
| MAIS-22-85 | 85 | 64 | 8 | 84 |
| MAIS-22-90 | 90 | 69 | 8 | 89 |
| MAIS-22-90/1 | 90 | 74.5 | 6.3 | 89 |
| MAIS-22-95 | 95 | 74 | 8 | 94 |
| MAIS-22-100 | 100 | 79 | 8 | 99 |
| MAIS-22-100/1 | 100 | 84.5 | 6.3 | 99 |
| MAIS-22-105 | 105 | 84 | 8 | 103.8 |
| MAIS-22-110 | 110 | 89 | 8 | 108.8 |
| MAIS-22-110/1 | 110 | 94.5 | 6.3 | 109 |
| MAIS-22-115 | 115 | 94 | 8 | 113.8 |
| MAIS-22-120 | 120 | 99 | 8 | 118.8 |
| MAIS-22-220 | 220 | 199 | 8 | 218.4 |
| MAIS-22-230 | 230 | 209 | 8 | 228.4 |
| MAIS-22-240 | 240 | 225 | 8 | 238.4 |
| MAIS-22-250 | 250 | 229 | 8 | 248.4 |
| MAIS-22-260 | 260 | 239 | 8 | 258.4 |
| MAIS-22-270 | 270 | 249 | 8 | 268.4 |
| MAIS-22-280 | 280 | 255.5 | 8 | 278.8 |
| MAIS-22-290 | 290 | 272 | 9.5 | 287.4 |
| MAIS-22-300 | 300 | 282 | 9.5 | 297.8 |
| MAIS-22-320 | 320 | 292 | 9.5 | 317.8 |
| MAIS-22-330 | 330 | 302 | 9.5 | 327.8 |
| MAIS-22-350 | 350 | 322 | 9.5 | 347.8 |
| MAIS-22-370 | 370 | 342 | 9.5 | 367.8 |
| MAIS-22-420 | 420 | 392 | 9.5 | 417.8 |
| MAIS-22-450 | 450 | 422 | 9.5 | 447.8 |
| MAIS-22-480 | 480 | 452 | 9.5 | 477.8 |
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