Our pressure‑responsive packing set for rods, glands and pistons. Popular with operators of older hydraulic plant.
Our Twinset packing set comprises an endless U-ring firmly supported by a header ring. The lips of the U-ring are slightly flared to provide an interference fit for initial sealing. When system pressure is applied, the sealing force is increased significantly by reaction within the tongue-shaped cavity of the U-ring.
Under slight axial compression, the header ring also spreads the U-ring lips slightly to improve low pressure sealing efficiency.
Although we recommend our more advanced designs for many traditional Twinset applications, this product remains a firm favourite with many operators of older hydraulic plant, and boasts a record of success stretching back over 50 years.
Twinset was developed for vertically reciprocating hydraulic shafts and rams. Current applications include the main rams of upstroking/gravity return presses and downstroking/prefilling type presses. It is also successful on press drawback rams, hydraulic piston heads, jacks and hoists, and hydraulic valves.
Note: This packing set should not be used under abrasive conditions or for heavy-duty applications (e.g., forging or extrusion presses), or on rams subjected to shock loads or side loads. In such cases, please contact us to recommend a suitable product.
Spring-loaded header ring
Standard materials are suitable for use with most mineral-based hydraulic fluids, lubricating oils and greases at temperatures up to +100°C (+212°F). They are also resistant to water and air.
The standards materials prove satisfactory for use with a number of fire-resistant fluids, including many of the phosphate ester type. Although swell will occur, most users find that this does not impair plant performance. Where fire-resistant fluids are used, it is essential to advise us of the type and designation.
Designed for use with heavy-duty hydraulic packings where conditions are particularly arduous.
Our compact rod/gland seal and single-acting piston seal with high and low pressure sealing capabilities.
Highly proven on industry's most arduous applications.
A compact rod / gland seal providing smooth operation and low levels of breakout and dynamic friction.
A rod and gland seal that operates reliably for long periods with the minimum thickness of fluid film on the dynamic contact surface.
A pressure-responsive hydraulic seal designed for arduous reciprocating gland applications.
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