Stuffing box packings are regarded as reliable and durable elements of sealing technology. Since they provide reliable leakage protection with high chemical and temperature resistance, stuffing box packings are used in various technical systems. They are preferably found in mechanical engineering such as pump technology or valve technology, but also in the chemical or metalworking industry as well as in tool and mould making.
Stuffing box packings are used to seal a rotating or axially moving shaft against the effects of liquid or vapour pressures, as well as against penetrating dirt or escaping lubricant.
A stuffing box consists of the stuffing box packing (the actual seal) and a stuffing box gland (a flange-like sleeve), with which the stuffing box packing is pressed axially by means of screws or springs.
With elastic sealing material, the axial compression also results in radial compression of the stuffing box packing on the shaft. Thus the sealing gap can be adjusted to a minimum adapted to the operating conditions. A small leakage cannot be completely excluded, but is often desired.
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