The NMY-type piston rod seal is a precision-engineered, small cross-section U-ring sealing element specifically designed for hydraulic cylinder piston rods. This specialized seal represents an intelligent alternative to conventional O-ring sealing solutions in compact hydraulic applications.
Compact O-Ring Interchangeable Design:
The NMY seal features a distinctive small cross-section profile engineered for direct interchangeability with JIS B 2401 P-series O-rings. This thoughtful design approach allows engineers to upgrade existing O-ring groove designs to superior U-ring sealing performance without modifying housing dimensions. The seal’s compact geometry makes it ideally suited for small-bore hydraulic cylinders where installation space is at a premium.
Precision Material Technology:
The NMY series is manufactured from specialized NBR compounds engineered for hydraulic service:
Standard Material: NBR (RN906)
Temperature Range: -10°C to +80°C
Maximum Pressure: 14 MPa (without backup rings) / 21 MPa (with backup rings)
Maximum Speed: 0.5 m/s
Hardness: Optimized for hydraulic sealing applications
Fluid Compatibility:
The NMY seal demonstrates excellent compatibility with a wide range of hydraulic fluids, including general petroleum-based hydraulic oils, water-glycol hydraulic fluids, and water-oil emulsion hydraulic fluids.
Key Performance Advantages:
Superior Sealing Performance: Provides significantly more stable sealing performance compared to O-rings, with enhanced leakage control throughout the operating cycle.
Excellent Friction Characteristics: The optimized U-ring geometry delivers superior frictional properties compared to O-ring alternatives, reducing breakout friction and ensuring smooth rod motion.
Wear Resistance: The precision-formulated NBR compound provides robust abrasion resistance, ensuring extended service life in demanding hydraulic applications.
Backup Ring Compatibility: For higher-pressure applications up to 21 MPa, the NMY seal can be used with compatible PT101 backup rings available in both bias-cut and endless configurations.
Direct O-Ring Replacement: Enables seamless upgrading from O-ring seals without requiring housing modifications, simplifying maintenance and design improvements.
Installation Considerations:
The NMY seal must be installed in the correct orientation as specified in technical documentation
For applications without backup rings, extrusion gap limits should be verified using manufacturer-provided extrusion curves
One-piece groove installation may not be possible in all configurations; divided groove designs should be considered when technically necessary
Proper surface finishes should conform to standard sequences for optimal sealing performance
Standard Size Range:
The NMY series is available in a comprehensive range of metric sizes for small-bore hydraulic cylinders, with rod diameters typically ranging from 3 mm to 30 mm and corresponding housing dimensions precisely specified for reliable installation.
Typical Applications:
The NMY piston rod seal is ideally suited for small-bore hydraulic cylinders, compact hydraulic equipment where space optimization is critical, applications currently using O-rings that require upgraded sealing performance, general industrial hydraulic systems with petroleum-based fluids, and machinery requiring reliable rod sealing in confined installation spaces.
The NMY Piston Rod Seal represents a precision-engineered, space-optimized sealing solution that masterfully combines O-ring groove compatibility with superior U-ring sealing performance. Its thoughtful design, robust NBR construction, and excellent friction characteristics make it the preferred choice for upgrading small-bore hydraulic cylinders from conventional O-ring sealing to advanced U-ring technology without housing modifications.
Original text from: pneumatic seal https://www.bszzseal.com/
