Definition

Noun: A type of nut specifically designed to compress and tighten the packing material within a stuffing box, a component used to create a seal around a rotating or reciprocating shaft (like a pump or valve stem) to prevent fluid leakage.

Usage

The "stuffing nut" is a mechanical part. It is threaded onto the stuffing box and tightened to apply pressure to the packing material (often called gland packing), thereby adjusting the seal around the shaft.

Examples

• Noun:
  • The mechanic tightened the stuffing nut to stop the leak from the pump shaft.
  • If the seal is too loose, you can adjust it by turning the stuffing nut clockwise.
  • Replacing the worn packing requires first loosening the stuffing nut.

Advanced Usage

• "to back off the stuffing nut": To loosen the stuffing nut, typically to reduce pressure on the packing or to allow for its replacement.
  • Before adding new packing rings, you must back off the stuffing nut.

Variants and Related Words

• Gland Nut: A synonymous term often used interchangeably with "stuffing nut."
• Packing Nut: Another common synonym.
• Stuffing Box: The assembly that contains the packing and is compressed by the stuffing nut.
• Gland Packing: The sealing material compressed by the stuffing nut.

Synonyms

• Gland nut
• Packing nut
• Adjusting nut (in this specific context)

Related Phrases

• "Tighten the stuffing nut": The primary action for compressing the packing to create a seal.

  • A small drip is acceptable, but if it streams, you should tighten the stuffing nut slightly.

• "Loosen the stuffing nut": The action to relieve pressure, often for maintenance or to allow a shaft to turn more freely.

  • If the pump is overheating, try to loosen the stuffing nut a quarter turn.

Noun

1. a nut used to tighten a stuffing box