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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 SPGW Seal is a high-pressure heavy-duty piston seal with excellent leakage control and superior extrusion and wear resistance
The SPGW seal is a combination of a PTFE based slipper seal energised by an elastomer profile ring and completed with two Back-up rings (POM). It is manufactured with a predefined interference fit, which together with the squeeze of the elastomer part ensures a good sealing effect even at low system pressure. At higher pressures the elastomer part is energised by the system pressure and consequently activates the slipper seal in the radial direction.
The Back-up rings prevent the slipper seal from extrusion and ensure a long service life even under harsh conditions.
| Technical data | ||||
| Temperature | -40°C / +100°C | |||
| Pressure | Up to 45MPa | |||
| Speed | Up to 1.5m/s | |||
| Medias | Mineral oil based hydraulic fluids /water oil and glycol / oil emulsions | |||
| Material | Elastomer NBR Friction ring Bronze-filled PTFE Back-up rings Polyoxymethylene (POM) | |||
| Advantages | Low friction coefficient; no stick-slip effect Possible increase in extrusion gaps Excellent extrusion resistance even during pressure peaks Excellent abrasion resistance Assembled by deformation | |||
| Applications | The SPGW seal is the recommended sealing element for double acting pistons of hydraulic cylinder working in very harsh conditions such as: Excavators, Mobile machinery, Heavy duty hydraulic cylinders | |||
| Part number | Bore diameter | Groove diameter | Seal height | Groove width |
| ØD1 H9 | Ød1 h9 | H1 | L1 0/+0.20 | |
| SPGW40*30*9 | 40 | 30 | 8.5 | 9 |
| SPGW45*35*9 | 45 | 35 | 8.5 | 9 |
| SPGW50*36*9 | 50 | 36 | 8.5 | 9 |
| SPGW55*41*9 | 55 | 41 | 8.5 | 9 |
| SPGW60*46*9 | 60 | 46 | 8.5 | 9 |
| SPGW63*48*11 | 63 | 48 | 10.5 | 11 |
| SPGW65*50*11 | 65 | 50 | 10.5 | 11 |
| SPGW70*55*11 | 70 | 55 | 10.5 | 11 |
| SPGW75*60*11 | 75 | 60 | 10.5 | 11 |
| SPGW80*65*11 | 80 | 65 | 10.5 | 11 |
| SPGW85*70*11 | 85 | 70 | 10.5 | 11 |
| SPGW90*75*11 | 90 | 75 | 10.5 | 11 |
| SPGW95*80*11 | 95 | 80 | 10.5 | 11 |
| SPGW100*85*12.5 | 100 | 85 | 12 | 12.5 |
| SPGW105*90*12.5 | 105 | 90 | 12 | 12.5 |
| SPGW110*95*12.5 | 110 | 95 | 12 | 12.5 |
| SPGW115*100*12.5 | 115 | 100 | 12 | 12.5 |
| SPGW120*105*12.5 | 120 | 105 | 12 | 12.5 |
| SPGW125*102*16 | 125 | 102 | 15.5 | 16 |
| SPGW130*107*16 | 130 | 107 | 15.5 | 16 |
| SPGW130*116*17.5 | 130 | 116 | 17 | 17.5 |
| SPGW135*112*16 | 135 | 112 | 15.5 | 16 |
| SPGW140*115*16 | 140 | 115 | 15.5 | 16 |
| SPGW140*117*16 | 140 | 117 | 15.5 | 16 |
| SPGW150*127*16 | 150 | 127 | 15.5 | 16 |
| SPGW150*134*16 | 150 | 134 | 15.5 | 16 |
| SPGW160*137*16 | 160 | 137 | 15.5 | 16 |
| SPGW170*147*16 | 170 | 147 | 15.5 | 16 |
| SPGW180*157*16 | 180 | 157 | 15.5 | 16 |
| SPGW185*162*16 | 185 | 162 | 15.5 | 16 |
| SPGW190*167*16 | 190 | 167 | 15.5 | 16 |
| SPGW200*177*16 | 200 | 177 | 15.5 | 16 |
| SPGW210*187*16 | 210 | 187 | 15.5 | 16 |
| SPGW220*197*16 | 220 | 197 | 15.5 | 16 |
| SPGW225*202*16 | 225 | 202 | 15.5 | 16 |
| SPGW230*207*16 | 230 | 207 | 15.5 | 16 |
| SPGW240*217*16 | 240 | 217 | 15.5 | 16 |
| SPGW250*222*17.5 | 250 | 222 | 17 | 17.5 |
| SPGW260*232*17.5 | 260 | 232 | 17 | 17.5 |
| SPGW270*242*17.5 | 270 | 242 | 17 | 17.5 |
| SPGW280*252*17.5 | 280 | 252 | 17 | 17.5 |
| SPGW300*272*17.5 | 300 | 272 | 17 | 17.5 |
| SPGW320*292*17.5 | 320 | 292 | 17 | 17.5 |
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.
