To achieve zero leakage between a moving member and a relatively stationary part a wide range of seals and rings are employed. However the most common least expensive and versatile is the Gland packing. Gland packing provides a dynamic seal for a rod shaft or stem via housing or gland which is packed with resilient or semi- resilient material providing a localized contact area which offer a physical barrier to leakage.
T N Venkataramani
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