PSD Rod Seal
Overview
The PSD rod seal is a compact, heavy-duty sealing system designed for extreme operating conditions in hydraulic cylinders. It combines robust sealing, high extrusion resistance, and reliable contamination exclusion in one integrated unit, excelling particularly under high pressure, low speed, and challenging environments.
Key Features
Multi-Component, Single-Groove Design: Integrates a low-friction sealing element (e.g., PTFE composite) and an elastomeric loading ring (e.g., HNBR) into a unified structure.
Robust Anti-Extrusion Support: Features a rigid metallic or high-strength plastic support ring embedded or mechanically paired to prevent gap extrusion at very high pressures.
Dual-Lip Geometry: Includes a pressure-adaptive primary sealing lip and a heavy-duty integrated wiper/scraper lip.
Wide-Temperature and Media Compatibility: Designed to perform in a broad temperature range and with various hydraulic fluids and environmental contaminants.
Function
Provides zero-leakage or micro-leakage sealing under high and fluctuating pressures.
Aggressively excludes abrasive particles, water, and other harsh contaminants.
Maintains sealing integrity under side loads and rod misalignment.
Resists extrusion in applications with large pressure spikes and radial clearance variations.
Typical Applications
Construction and Mining Equipment: Excavator, bulldozer, and drilling cylinders.
Heavy Industrial Machinery: Metal-forming presses, rolling mills, and large clamping cylinders.
Marine and Offshore Hydraulics
Applications subject to shock loads, dirty environments, and severe duty cycles.
Advantages
Superior Pressure and Extrusion Resistance: Ideal for pressures exceeding 40 MPa.
Exceptional Durability and Long Service Life in abrasive or chemically aggressive conditions.
Stable Sealing under low-speed or oscillating movements.
All-in-One Simplicity: Reduces design complexity compared to multi-part seal stacks.
Installation Notes
Requires a precision-machined, deep rectangular groove.
Must be installed with the primary sealing lip facing the fluid side and the heavy-duty scraper lip facing the environment.
Critical surface finish on the rod (hard chrome-plated, fine roughness) is essential for optimal performance.
Conclusion
The PSD rod seal is an engineered solution for the most demanding rod sealing challenges, where extreme pressure, contamination, and reliability are non-negotiable. It delivers maximum security and durability in a single, robust package.
Original text from: pneumatic seal https://www.bszzseal.com/
