Universal Seal Cage

Universal Seal Cage

Universal Seal Cage, also wel know by PTFE Lantern rings, is usually in the center of every compression packing set in a centrifugal pump. They are simple components, but get something wrong when selecting, installing or operating them, and big problems may occur in the stuffing box. A lantern ring is placed between packing rings in each packing set and extends the life of the packing, stuffing box and shaft. Ultimately, lantern rings increase the life span of the pump system.

About Universal Seal Cage

Ensuring stuffing box reliability and controlling the environment mitigate many issues in the ‘space’ where it happens.

Universal Seal Cage

Purposes:
1. Protection
2. Cooling
3. Lubrication.

Size of Universal Seal Cage / H * W (mm)

LENGTH 1200MM
7,6x11,49,0x 13,29,0x199,4x13,210,5x 14,3
10,5x2211,1x15,612,1x1712,1x25,412,6x17
13,5x19,214,2x19,215,2x20,615,2x3117x22,1
18,1x22,118,1x3819 x23,820,8x25,223,5x28,2
Remark: Considering the inch size, there may be some error between the actual delivery size and the data in this table, which will not affect installation and use.

Universal Seal Cage Structural Style

ptfe lantern ring Universal Seal Cage

Materials for Universal Seal Cage

Universal Seal Cage is made by  PTFE or PEEK.

PTFE & PEEK Strengths & Weaknesses
PTFE Strengths PTFE Weaknesses
Broad chemical resistanceCreep and cold flow
NonflammableRelatively soft
Low-temperature flexibilityLow thermal dissipation
Low coefficient of frictionPoor dimensional stability
High-temperature stabilityHigh material shrinkage
Easy to processLow rigidity
High-frequency resistanceLow electrical conductivity
PEEK Strengths PEEK Weaknesses
Tensile strength, elongation and wear propertiesNot suitable for applications involving nitric or sulfuric acid
Chemical resistanceMore costly
Withstands long exposure to high pressure, water
and steam
Difficult to process
Low flammability 
Resistant to gamma
radiation
 
Continuous use up to 500F 

How Is a Universal Seal Cage Installed?

Most packing sets have five packing rings. The lantern ring can be inserted after the second or third packing ring is installed. This all depends on where the flush port of the stuffing box is located. To ensure that the lantern ring is installed correctly, insert a small object through the flush port and feel the lantern ring. Once this is done and all the packing rings and packing follower are installed, end users should install the proper flush setup and start flushing the stuffing box. For many reasons, starting the flush before operating the pump is important. One reason is to ensure that flush water is moving through the lantern ring and into the stuffing box correctly. Care must be taken to ensure the lantern ring’s fit around the shaft is correct. Most lantern rings have a larger fit on the inside diameter and a tighter fit on the outside diameter, so frictional heat is not an issue.

PTFE lantern ring
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