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A pressure‑responsive hydraulic seal designed for arduous reciprocating gland applications.
Lofilm HD is a pressure responsive hydraulic seal specifically designed for arduous reciprocating gland applications, where fast pressure rises occur and side loads can be substantial. In heavy-duty horizontal applications, it operates as a highly efficient seal and also accommodates lateral or side loads.
The seal normally comprises one heavy-duty intermediate ring of rubberised fabric, a gland ring/female adapter, and a moulded rubber asymmetrical header ring that is the principal sealing element of the set.
An annular groove incorporated in the header increases its response to applied pressure. The ported 'odd-leg' header design allows gland loading to be transferred through the set to the neck bush - often not fixed - while enabling the system pressure to act on the annular groove. In addition, the rubber sealing lips conform readily to an uneven surface - such as a worn shaft - to improve sealing integrity.
In operation, the initial radial interference reduces the fluid film to a minimum over a wide range of conditions, particularly on down-stroking where excessive leakage can be hazardous. This is also important on equipment that uses auxiliary cylinders to provide rapid advance.
Gland ring/female adapter
Intermediate ring
Header ring
Standard materials - i.e. nitrile (NBR)
Special materials
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