How Do the Stuffing Box and Packing Work Together? Is Tighter Packing Always Better?
The stuffing box is used to house the packing, gland follower, or other shaft seal components. After the packing is installed in the stuffing box, appropriate pressure is applied via the gland follower to form a seal between the packing and the shaft sleeve or pump shaft.
Tighter packing is not always better.
If it is too loose, excessive leakage may occur; if it is overtightened, it may increase friction, causing temperatures to rise in the packing, shaft sleeve, and related components, accelerating wear and increasing motor load.
In some industrial pumps, packing seals may need to maintain a small, controlled amount of leakage to assist with lubrication and heat dissipation. The allowable leakage rate and whether flush water is required should be confirmed according to the specific pump model, medium, and installation instructions.
Repeatedly adding packing or continually tightening the gland follower will not resolve all sealing issues. The actual cause of leakage or overheating should be identified first.
