14K Restrictor Bushings

Chesterton 14K Restriction Bushings are used in rotary equipment to form a barrier between the sealing device in the stuffing box or the pump impeller housing and the fluid in the mixing tank. The restriction that is produced reduces flush requirements and helps to minimize suspended abrasive particles from entering the stuffing box area, thus prolonging the service life of installed packing sets or mechanical seals.

 

The 14K seal tapered lip design conforms to equipment eccentricities to minimize the annular gap formed around the rotating shafts, thereby creating the smallest possible free flow area for controlling flush flow rates. A secondary beneficial effect of increasing pressure drop with the 14K is that the flush around the shaft becomes very uniform, which is critical in minimizing particulates from entering the stuffing box envelope. The dynamic lip acts as a check valve when flush is shut off.

 

The solid 14K reduces the number of packing rings required in the stuffing box which helps to reduce frictional force. Further, it helps to keep the lantern ring in its position and maintains the optimum flush rate. The 14K is manufactured from superior abrasion‑resistant polymers, while the PTFE compound offers broad media compatibility with high‑temperature capability.

 

The 14K restriction bushings are manufactured using a machining process that allows the flexibility to create any size based on equipment dimensions. Each bushing is individually manufactured and provides excellent performance in pumps, agitators, mixers, refiners, and other equipment.