The DKBI dust seal is a metal-cased double lip wiper seal designed to prevent dust, mud, sand, and metal particles from entering hydraulic cylinders. It features a PU (polyurethane) sealing lip encased in a steel metal frame . The double lip design provides excellent dust scraping capability, effectively protecting the piston rod and main rod seal from abrasive contaminants .
SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise
Product Overview
The DKBI dust seal is a specialized wiper seal designed for hydraulic cylinder rod applications. The “DKBI” designation indicates the seal uses a PU (polyurethane) lip with a metal frame construction – distinguishing it from the DKB type which uses an NBR rubber lip . The combination of a polyurethane wiping element securely bonded to a rust-inhibited metal case provides exceptional abrasion resistance and durability under difficult operating conditions .
The DKBI seal features a double lip design :
- Primary (Scraper) Lip – Contacts the piston rod surface, scraping off dust, mud, and debris during rod retraction
- Secondary (Dust) Lip – Blocks external contaminants from entering the cylinder
How It Works
The DKBI operates through a combination of physical scraping and elastic sealing . The precision-trimmed polyurethane wiping lip conforms to the side movement of the rod, effectively clearing away heavily deposited dirt. The metal case provides structural rigidity and ensures a secure interference fit in the mounting groove . The seal is designed for reciprocating, oscillating, or rotary motion systems .
DKBI vs DKB: What’s the Difference?
| Feature |
DKBI |
DKB |
| Lip Material |
PU (Polyurethane) |
NBR (Nitrile Rubber) |
| Structure |
Metal-cased double lip |
Rubber lip (with or without metal case) |
| Best For |
Heavy-duty, abrasive environments |
Standard applications |
Specifications and Parameters
| Parameter |
Detail |
| Product Name |
DKBI Dust Seal / Wiper Seal |
| Type |
Metal-cased double lip dust seal |
| Lip Material |
PU (Polyurethane) / Modified TPU |
| Metal Frame Material |
Steel / Cold-rolled steel sheet |
| Hardness |
90-95 Shore A |
| Working Pressure |
≤ 32 MPa |
| Temperature Range |
-35°C to +120°C |
| Working Speed |
≤ 1-3 m/s |
| Medium |
Hydraulic oil, emulsions, water, air |
| Application |
Hydraulic cylinder rod dust sealing, wiper seal |
Product Features
1. Double Lip Protection
The primary lip scrapes contaminants while the secondary lip blocks dust ingress, providing comprehensive protection for the piston rod and main seal .
2. Metal-Cased Reinforcement
The steel metal frame ensures a secure interference fit, prevents seal displacement, and provides structural rigidity .
3. Excellent Wear Resistance
The high-performance PU material provides outstanding abrasion resistance, making it ideal for harsh environments .
4. Superior Contamination Exclusion
Effective at scraping dust, mud, sand, and metal particles – ideal for construction and mining applications .
5. Simple Groove Design
Features a simple groove design that is easy to machine and allows for fast, stable installation .
6. Wide Temperature Range
Operates reliably from -35°C to +120°C, suitable for various climate conditions .
7. Strong Oil-Scraping Performance
Effectively removes excess oil from the piston rod surface during retraction .
Need DKBI metal-cased dust seals for your excavator or hydraulic cylinder applications?
Contact SANPING SEAL today with your rod size requirements. Our team will provide a free quote within 24 hours.
