The DKB hydraulic rod seal is a double lip U-cup rod seal designed specifically for high pressure hydraulic cylinder applications . It features a compact design with two sealing lips and an integrated anti-extrusion ring . The seal provides excellent sealing performance in demanding conditions, making it suitable for construction machinery, mining equipment, and industrial hydraulic systems .
SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise
Product Overview
The DKB seal is a high-performance rod seal specifically engineered for high pressure hydraulic applications . Unlike traditional U-cup seals, the DKB features an asymmetrical lip design with a shortened inner sealing lip that improves sealing characteristics and reduces compression set . The seal also includes an integrated anti-extrusion ring that prevents seal damage under high pressure conditions .
The compact cross-section design allows for easy installation in standard grooves, making the DKB a preferred choice for hydraulic cylinder manufacturers and repair shops .
Specifications and Parameters：
Minimum order: 10 sets
| Parameter |
Detail |
| Product Name |
DKB Hydraulic Rod Seal |
| Type |
Double lip U-cup rod seal |
| Material |
PU (Polyurethane) – standard |
| Hardness |
90-95 Shore A |
| Color |
Black、Sliver |
| Working Pressure |
≤ 40 MPa (400 bar) |
| Temperature Range |
-35°C to +100°C |
| Working Speed |
≤ 0.5 m/s |
| Medium |
Mineral oil-based hydraulic oils |
| Feature |
Integrated anti-extrusion ring |
| Application |
Rod seal for double-acting hydraulic cylinders |
Product Features
1. Double Lip Design
The DKB seal features two sealing lips that provide enhanced sealing performance . The primary lip seals the hydraulic fluid inside the cylinder, while the secondary lip helps maintain the oil film on the rod surface during retraction .
2. Shortened Inner Lip
The inner lip is intentionally shortened to improve sealing characteristics and reduce compression set . This design feature allows the DKB to maintain consistent sealing performance over extended periods .
3. Integrated Anti-Extrusion Ring
Unlike standard U-cup seals, the DKB includes an integrated anti-extrusion ring that prevents seal material from extruding into the gap between the rod and cylinder head under high pressure . This significantly extends seal life in high pressure applications .
4. High Pressure Capability
With a maximum working pressure of 40 MPa, the DKB seal is suitable for heavy-duty hydraulic applications including excavators, loaders, and other construction machinery .
5. Excellent Wear Resistance
Made from high-quality polyurethane material with 90-95 Shore A hardness, the DKB seal offers outstanding abrasion resistance and long service life .
6. Easy Installation
The compact cross-section design allows for straightforward installation without special tools .
Applications
The DKB hydraulic rod seal is widely used in hydraulic cylinders across various industries:
Construction Machinery:
● Excavator hydraulic cylinders (boom, arm, bucket)
● Loader hydraulic systems
● Bulldozer cylinders
● Backhoe loader cylinders
Industrial Equipment:
● Hydraulic presses
● Injection molding machines
● Heavy-duty hydraulic cylinders
● Agricultural machinery
Mining Equipment:
● Mining vehicle hydraulic systems
● Underground equipment cylinders
● Rock drilling machinery
Why Choose SANPING SEAL?
17 Years of Export Expertise
Guangzhou Sanping Machinery Co., Ltd., established in 2009, has served customers across South Asia, Southeast Asia, Africa, South America, the Middle East, and Europe.
Specialized Focus
We concentrate exclusively on engineering machinery high-end seals, ensuring we understand your equipment applications better than general seal suppliers.
Quality Guarantee
Every order follows our two-step quality process: pre-production sample testing before mass production, and final inspection before shipment.
Frequently Asked Questions (FAQ)
Q: What is the difference between DKB and IDI seals?
A: DKB is the revised version of the IDI rod seal . The main difference is that DKB features a higher working pressure rating (40 MPa vs 35 MPa for IDI) and includes an integrated anti-extrusion ring .
Q: What material is used for DKB seals?
A: DKB seals are made from high-quality polyurethane (PU) with a hardness of 90-95 Shore A .
Q: What is the maximum working pressure?
A: The maximum working pressure is 40 MPa (400 bar) .
Q: What colors are available?
A: We offer DKB seals in blue, green, yellow, and red .
Q: What is the temperature range?
A: The seal operates from -35°C to +100°C .
Q: What makes DKB different from standard U-cup seals?
A: DKB features a shortened inner lip for better sealing performance and an integrated anti-extrusion ring for high pressure applications .
Q: What are your payment terms?
A: We accept T/T (bank transfer), L/C, MoneyGram, Western Union, and cash.
