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Hydraulic seals and pneumatic seals are designed as per the cylinder working pressure, cylinder speed, operating temperature, working medium and application.
Hydraulic seals are generally relatively soft, non-metallic rings captured in groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications. Hydraulic seals are vital in machinery. Their use is critical in providing a way for fluid power to be converted to linear motion. Not only must the hydraulic seals prevent leakage of fluid from the Cylinder, but hydraulic seals must also withstand high pressures, extreme temperatures and transverse forces within the cylinder. In such applications, the function of Hydraulic Seals goes far beyond preventing fluid leakage.
Hydraulic seals can be made from a variety of materials such as polyurethane, rubber or PTFE. The type of material is determined by the specific operating conditions or limits due to fluid type, pressure, fluid chemical compatibility or temperature.
A static hydraulic seal is located in a groove and sees no movement - only sealing within its confined space, acting like gasket.
A type of dynamic hydraulic seal called a rod seal is exposed to movement on its inner diameter along the shaft or rod of a hydraulic cylinder.
A type of dynamic hydraulic seal called a piston seal is exposed to movement on its outer diameter along the tube or bore of a hydraulic cylinder.
NextGen Tech has a complete range of hydraulic seals and we can also assist you in creating custom-made seals for linear and static hydraulic applications.
Seal Functions
Each dynamic seal in a hydraulic cylinder has a special function to contribute to the performance of the system.
Piston Seal Functions
Acts as a pressure barrier and prevents fluid passing the piston; important for controlling the cylinder motion or maintaining the position at rest
Rod Seal Functions
Act as a pressure barrier and keeps the operating fluid inside the cylinder
Regulates a film of fluid on the surface of the piston rod as it extends; important to inhibit rod corrosion and lubricate the wiper and rod seal itself
Accept the lubrication film back into the cylinder when the rod retracts
Buffer Seal Functions
Protect the rod seal from fluid pressure spikes in excess of system pressure
Attenuate the fluctuations in system pressure, thereby improving rod seal performance by allowing the rod seal to deal with more constant or gradually changing pressure
Act as an internal excluder to keep system contaminants, such as metal particles from damaging the rod seal
Wiper Seal Functions
Prevent external contaminants from entering the cylinder assembly and hydraulic system (pump, reservoir etc)
Accept the lubrication film back into the cylinder when the rod retracts
Guide Rings (rod and piston) Functions
Prevent metal to metal contact between components
React to radial loads caused by side loads on the cylinder assembly
The NextGen Tech slide ring DKK is used to seal and guide pistons on double-acting hydraulic cylinders. It consists of 6 parts, a special shaped elastic ring of a modified NBR, a slide ring of abrasion resistant PTFE-Bronze compound which acts as the sealing ring, two lateral support rings of modified PU and two bearing rings of pressure-resistant POM PTFE-Bronze compound.
The elastic ring energizes the slide ring to press it against the cylinder wall, providing a sealing function at zero working pressure. The onset of pressure compresses the elastic ring which increases the radial force pressing the slide ring against the cylinder wall, thereby increasing the sealing effect.
The two support rings prevent extrusion of the slide ring at high pressures. The special profile of the support rings encourages uniform fluid and pressure distribution onto the elastic inner ring. The bearing rings positioned on the support rings make contact with the cylinder walls and prevent metallic contact between the piston and the cylinder tube.
| Technical data | ||||
| Temperature | -30°C / +120°C | |||
| Pressure | Up to 45MPa | |||
| Speed | Up to 1m/s | |||
| Medias | The seal can be used in standard form with HFA/HFB, mineral oils and water base fluids. | |||
| Material | Support Ring: Polyamide(PA) Polytetrafluoroethylene (PTFE) Bearing Rings: PA or PTFE Slide Ring: PTFE Elastic Ring: NBR | |||
| Applications | High fluid resistance and wide temperature range.Compact slide ring seal for extraordinary applications.The seal design and materials used make it particularly suitable for the most vigorous applications e.g.:Construction machine cylinders. | |||
| Fitting | One of the two split support rings is snapped into the groove followed by the elastic inner ring. The slide ring is then positioned on the elastic inner ring followed by insertion of the second support ring. The two split bearing elements can then easily be snapped into their grooves adjacent to the support rings. | |||
| Item No. | D | d | b | d2 | d3 | a | c | f | e |
| DKK40*26*32 | 40 | 26 | 32 | 32 | 36 | 3 | 15.5 | 8.25 | 7 |
| DKK45*31*32 | 45 | 31 | 32 | 37 | 41 | 3 | 15.5 | 8.25 | 7 |
| DKK50*34*39 | 50 | 34 | 39 | 42 | 46 | 3 | 20.5 | 9.25 | 7 |
| DKK56*40*39 | 56 | 40 | 39 | 48 | 52 | 3 | 20.5 | 9.25 | 7 |
| DKK63*47*39 | 63 | 47 | 39 | 55 | 59 | 3 | 20.5 | 9.25 | 7 |
| DKK65*49*39 | 65 | 49 | 39 | 57 | 61 | 3 | 20.5 | 9.25 | 7 |
| DKK70*54*39 | 70 | 54 | 39 | 62 | 66 | 3 | 20.5 | 9.25 | 7 |
| DKK75*59*39 | 75 | 59 | 39 | 67 | 71 | 3 | 20.5 | 9.25 | 7 |
| DKK80*62*43 | 80 | 62 | 43 | 72 | 76 | 3 | 22.5 | 10.25 | 7 |
| DKK85*67*43 | 85 | 67 | 43 | 77 | 81 | 3 | 22.5 | 10.25 | 7 |
| DKK90*72*43 | 90 | 72 | 43 | 82 | 86 | 3 | 22.5 | 10.25 | 7 |
| DKK95*77*43 | 95 | 77 | 43 | 87 | 91 | 3 | 22.5 | 10.25 | 7 |
| DKK100*82*43 | 100 | 82 | 43 | 92 | 96 | 3 | 22.5 | 10.25 | 10 |
| DKK110*92*43 | 110 | 92 | 43 | 102 | 106 | 3 | 22.5 | 10.25 | 10 |
| DKK115*97*43 | 115 | 97 | 43 | 107 | 111 | 3 | 22.5 | 10.25 | 10 |
| DKK120*102*43 | 120 | 102 | 43 | 112 | 116 | 3 | 22.5 | 10.25 | 10 |
| DKK125*103*53 | 125 | 103 | 53 | 115 | 121 | 4 | 26.5 | 13.25 | 10 |
| DKK130*108*53 | 130 | 108 | 53 | 120 | 126 | 4 | 26.5 | 13.25 | 10 |
| DKK140*118*53 | 140 | 118 | 53 | 130 | 136 | 4 | 26.5 | 13.25 | 10 |
| DKK150*128*53 | 150 | 128 | 53 | 140 | 146 | 4 | 26.5 | 13.25 | 10 |
| DKK160*138*53 | 160 | 138 | 53 | 150 | 156 | 4 | 26.5 | 13.25 | 10 |
| DKK170*148*57 | 170 | 148 | 57 | 160 | 166 | 6 | 26.5 | 15.25 | 10 |
| DKK180*158*57 | 180 | 158 | 57 | 170 | 176 | 6 | 26.5 | 15.25 | 10 |
| DKK190*165*64 | 190 | 165 | 64 | 180 | 186 | 4.5 | 31.5 | 16.25 | 10 |
| DKK200*175*64 | 200 | 175 | 64 | 190 | 196 | 4.5 | 31.5 | 16.25 | 10 |
| DKK210*185*71 | 210 | 185 | 71 | 200 | 206 | 8 | 31.5 | 19.75 | 12 |
| DKK220*195*71 | 220 | 195 | 71 | 210 | 216 | 8 | 31.5 | 19.75 | 12 |
| DKK225*200*71 | 225 | 200 | 71 | 215 | 221 | 8 | 31.5 | 19.75 | 12 |
| DKK230*205*85 | 230 | 205 | 85 | 220 | 226 | 15 | 31.5 | 26.75 | 12 |
| DKK240*205*85 | 240 | 205 | 85 | 230 | 236 | 15 | 31.5 | 26.75 | 12 |
| DKK250*225*85 | 250 | 225 | 85 | 240 | 246 | 15 | 31.5 | 26.75 | 12 |
| DKK275*250*85 | 275 | 250 | 85 | 265 | 271 | 15 | 31.5 | 26.75 | 12 |
| DKK280*255*85 | 280 | 255 | 85 | 270 | 276 | 15 | 31.5 | 26.75 | 12 |
| DKK290*265*85 | 290 | 265 | 85 | 280 | 286 | 15 | 31.5 | 26.75 | 12 |
| DKK300*275*85 | 300 | 275 | 85 | 290 | 296 | 15 | 31.5 | 26.75 | 12 |
| DKK310*280*80 | 310 | 280 | 80 | 298 | 304 | 8.5 | 36.5 | 21.75 | 15 |
| DKK320*290*80 | 320 | 290 | 80 | 308 | 314 | 8.5 | 36.5 | 21.75 | 15 |
| DKK350*320*80 | 350 | 320 | 80 | 338 | 344 | 8.5 | 36.5 | 21.75 | 15 |
| DKK360*330*80 | 360 | 330 | 80 | 348 | 354 | 8.5 | 36.5 | 21.75 | 15 |
| DKK380*350*80 | 380 | 350 | 80 | 368 | 374 | 8.5 | 36.5 | 21.75 | 15 |
| DKK400*370*80 | 400 | 370 | 80 | 388 | 394 | 8.5 | 36.5 | 21.75 | 15 |
| DKK420*390*80 | 420 | 390 | 80 | 408 | 414 | 8.5 | 36.5 | 21.75 | 15 |
| DKK450*420*80 | 450 | 420 | 80 | 438 | 444 | 8.5 | 36.5 | 21.75 | 15 |
| DKK480*450*80 | 480 | 450 | 80 | 468 | 474 | 8.5 | 36.5 | 21.75 | 15 |
| DKK500*470*80 | 500 | 470 | 80 | 488 | 494 | 8.5 | 36.5 | 21.75 | 15 |
| DKK540*510*80 | 540 | 510 | 80 | 528 | 534 | 8.5 | 36.5 | 21.75 | 15 |
| DKK560*530*80 | 560 | 530 | 80 | 548 | 554 | 8.5 | 36.5 | 21.75 | 15 |
| DKK580*550*80 | 580 | 550 | 80 | 568 | 574 | 8.5 | 36.5 | 21.75 | 15 |
| DKK600*570*80 | 600 | 570 | 80 | 588 | 594 | 8.5 | 36.5 | 21.75 | 15 |
| DKK630*600*80 | 630 | 600 | 80 | 618 | 624 | 8.5 | 36.5 | 21.75 | 15 |
| DKK640*610*80 | 640 | 610 | 80 | 628 | 634 | 8.5 | 36.5 | 21.75 | 15 |
| DKK650*620*80 | 650 | 620 | 80 | 638 | 644 | 8.5 | 36.5 | 21.75 | 15 |
| DKK680*650*80 | 680 | 650 | 80 | 668 | 674 | 8.5 | 36.5 | 21.75 | 15 |
| DKK700*670*80 | 700 | 670 | 80 | 688 | 694 | 8.5 | 36.5 | 21.75 | 15 |
| DKK750*720*80 | 750 | 720 | 80 | 738 | 744 | 8.5 | 36.5 | 21.75 | 15 |
| DKK800*770*80 | 800 | 770 | 80 | 788 | 794 | 8.5 | 36.5 | 21.75 | 15 |
| DKK1200*1170*80 | 1200 | 1170 | 80 | 1188 | 1194 | 8.5 | 36.5 | 21.75 | 15 |
| DKK1400*1370*80 | 1400 | 1370 | 80 | 1388 | 1394 | 8.5 | 36.5 | 21.75 | 15 |
1.our price:
Our price is not the lowest one, but compared with the same quality level product,ours is the best one.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Kind: Oil Seals,O-ring, Rod/Piston seal, Gas seal, Guide elements, Large sized Seals Customized Seals.
Material: NBR/EPDM/FKM/Silicone/HNBR/PU
4. Shipping:
Quickly delivery, with several delivery ways, such as DHL/FEDEX/UPS/TNT express, Air and Ocean shipping way. We have several express accounts and can help you save cost.
5, about customized Service:
Drawings or samples, it is enough. We can produce colored rubber seal just based on your drawing or samples with kinds of colors. We also can give the professional advice based on your requirement.
