The KDAS compact piston seal is a 5-component combination seal specifically designed for piston sealing in double-acting hydraulic cylinders . It consists of one elastic rubber sealing ring, two backup rings, and two guide rings . This integrated design provides both sealing and guiding functions in a compact space, making it ideal for hydraulic cylinders in excavators, loaders, bulldozers, and other engineering machinery .
SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise
Product Overview
The KDAS seal is a bidirectional piston seal that combines sealing and guiding functions in one compact assembly . The 5-component design includes an elastic rubber sealing ring in the middle, with one backup ring and one guide ring placed on each side . The sealing ring provides the primary sealing function, the backup rings prevent extrusion under high pressure, and the guide rings provide piston guidance and absorb radial loads .
This design allows for a shorter piston length and lower production costs, as the seal and guide rings share the same groove .
Specifications and Parameters：
Minimum order: 10 sets
| Parameter |
Detail |
| Product Name |
KDAS Compact Piston Seal |
| Type |
5-Component Combination Seal |
| Material |
NBR (sealing ring) + PU/POM (backup rings) + POM (guide rings) |
| Hardness |
90 Shore A (sealing ring) |
| Color |
NBR sealing ring: Black / Backup rings & Guide rings: Blue, Yellow, Orange, Green |
| Working Pressure |
≤ 40 MPa |
| Temperature Range |
-35°C to +110°C |
| Working Speed |
≤ 0.5 m/s |
| Medium |
Mineral oil-based hydraulic oils, fire-resistant hydraulic fluids, biodegradable fluids |
| Application |
Piston seal for double-acting hydraulic cylinders |
Product Features
1. 5-Component Integrated Design
The KDAS seal combines sealing ring, backup rings, and guide rings in one compact unit . The guide rings provide piston guidance and absorb radial forces, while the backup rings prevent seal extrusion under high pressure .
2. High Pressure Resistance
With a maximum working pressure of 40 MPa, the KDAS seal offers excellent resistance against extrusion and maintains stable performance under shock loads and pressure peaks .
3. Compact Installation
The seal and guide rings share the same groove, allowing for a shorter piston total length . This compact design reduces piston production costs and saves space.
4. No Twisting or Rolling
The special geometric design of the NBR sealing ring prevents twisting and rolling during installation and operation .
5. Good Anti-Leakage Performance
The bidirectional sealing design provides reliable sealing in both directions, effectively preventing hydraulic fluid leakage .
6. Easy Assembly
The backup rings and guide rings feature a split design (angled cut), making them easy to install without special tools .
7. Wide Temperature Range
With an operating range from -35°C to +110°C, the KDAS seal performs reliably in various climate conditions .
Applications
The KDAS compact piston seal is widely used in hydraulic cylinders for reciprocating motion applications :
● Excavator hydraulic cylinders
● Loader hydraulic systems
● Bulldozers
● Forklifts
● Cranes
● Agricultural machinery
● Injection molding machines
● Hydraulic gates
● Industrial hydraulic equipment
Available Sizes
● KDAS seals are available in a wide range of standard sizes.
● Custom sizes are also available upon request .
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 does KDAS stand for?
A: KDAS refers to a standard type of 5-component combination piston seal design .
Q: What are the five components of the KDAS seal?
A: The KDAS seal consists of one elastic rubber sealing ring (center), two backup rings, and two guide rings .
Q: What materials are used for KDAS seals?
A: The sealing ring is made of NBR rubber; the backup rings are made of PU (polyurethane); the guide rings are made of POM (acetal) .
Q: What is the maximum working pressure?
A: The maximum working pressure is 40 MPa .
Q: What is the temperature range?
A: The seal operates from -35°C to +110°C .
Q: Is this seal suitable for double-acting cylinders?
A: Yes, the KDAS seal is specifically designed for bidirectional sealing in double-acting hydraulic cylinders .
Q: What are your payment terms?
A: We accept T/T (bank transfer), L/C, MoneyGram, Western Union, and cash.
