Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
Double U-Seal & Metal Skeleton Bonded Pneumatic DK Piston
Buffer-Type Design for Rapid Full-Pressure Response, Low Friction with Lubricating Film Retention
The Pneumatic Sealing DK Integral Piston is a dual-functional component integrating sealing and guiding capabilities, specifically designed for double-acting pneumatic cylinders (both with and without end buffers). It adopts a double U-seal structure that is sulfur-bonded to a metal skeleton, with an all-over rubber coating to enhance corrosion resistance and eliminate the need for additional sealing elements during installation.
Compatible with both oil-lubricated air and initially lubricated oil-free air, this piston operates within a maximum pressure of 16bar, a surface speed of 1m/s, and a temperature range of -35℃ to +80℃ (based on NBR-based synthetic rubber materials: Shore A71 as standard, Shore A78 recommended for cylinder bores over 100mm). Its vent groove design enables rapid response to full pressure loads, while the optimized seal lip geometry maintains a lubricating film, ensuring low friction and smooth operation. It should be noted that it is not suitable for withstanding excessive loads in long-stroke or curved working conditions.
5.0
design customization
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Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
1. Product Advantages
All-in-One Functionality: Integrates sealing and guiding functions in a single unit, eliminating the need for additional components and simplifying assembly.
Superior Durability: Features a sulfur-bonded double U-seal and metal skeleton, paired with full rubber coating, to resist corrosion and wear—extending service life in harsh pneumatic environments.
Low-Friction Operation: Optimized seal lip geometry retains a stable lubricating film, reducing friction to ensure smooth movement and minimizing energy loss during operation.
Rapid Pressure Response: Built-in vent groove structure enables quick adaptation to full pressure loads, avoiding delays in cylinder actuation.
Wide Compatibility: Works with both oil-lubricated air and initially lubricated oil-free air, meeting diverse application needs without compromising performance.
2. Working Principle
The Pneumatic Sealing DK operates by leveraging its double U-seal design to create an airtight barrier between the piston and cylinder bore, preventing air leakage during pressure cycles. The metal skeleton provides structural support, ensuring the piston maintains alignment (guiding function) as it moves. When air pressure is applied, the vent groove rapidly distributes pressure across the seal, enabling instant piston response. The rubber coating and lubricating film retention further reduce contact resistance, allowing the piston to move smoothly at a maximum surface speed of 1m/s while withstanding up to 16bar of working pressure.
3. Product Details
Materials: NBR-based synthetic rubber (standard Shore A71; Shore A78 recommended for cylinder bores >100mm) bonded to a corrosion-resistant metal skeleton via sulfur vulcanization.
Working Parameters: Max working pressure: 16bar; Operating temperature range: -35℃ to +80℃ (Z5071 material) / -30℃ to +80℃ (Z5051 material); Surface speed: 1m/s.
Installation: Designed for easy fixing on piston rods—no extra sealing or complex tools required, reducing assembly time.
Design Features: Rubber-coated exterior for anti-corrosion; optimized seal lip for lubrication retention; vent groove for pressure responsiveness.
4. Application Range
Ideal for double-acting pneumatic cylinders (both with and without end buffers) in industries such as:
Automated manufacturing (conveyor systems, robotic arms)
Automotive assembly lines (pneumatic actuators for part handling)
Packaging machinery (cylinder-driven sealing or cutting mechanisms)
General industrial pneumatic systems (valve controls, linear motion devices)
Note: Not suitable for long-stroke or curved working conditions where excessive radial loads may occur.
5. FAQ
Q1: Can the Pneumatic Sealing DK be used with oil-free air?
A1: Yes, it is compatible with initially lubricated oil-free air (and oil-lubricated air), making it versatile for systems with limited lubrication.
Q2: What material options are available for different temperatures?
A2: Two standard materials: Z5051 (-30℃ to +80℃) and Z5071 (-35℃ to +80℃), covering most industrial temperature needs.
Q3: Do I need to install additional seals when using this piston?
A3: No—its integral design includes built-in sealing capabilities, so no extra sealing components are required.
Q4: Is it suitable for large-bore cylinders?
A4: Yes, for cylinder bores over 100mm, we recommend the Shore A78 rubber material to ensure optimal sealing performance under increased pressure.
6. Company Selling Points (Forever Seals)
Expertise in Sealing Solutions: With years of experience in pneumatic sealing technology, we engineer products that meet strict industrial standards for reliability and performance.
Customization Capabilities: Beyond standard DK models, we offer tailored solutions (material adjustments, size modifications) to fit unique customer applications.
Quality Assurance: Every Pneumatic Sealing DK undergoes rigorous testing (pressure resistance, temperature cycling, friction measurement) to ensure consistency.
Global Support: We provide timely technical assistance, fast delivery, and after-sales service to customers worldwide, ensuring minimal downtime for your operations.
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