Valve Seal Case Study

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The top layer of the pad is a non-woven Polypropylene (which allows moisture to soak through) with a bottom layer of moisture proof Polyethylene to contain the absorbent crystals within the middle of the pad. There are different size and shape combinations depending on the food product in question.

Customer Profile

This company is a leading manufacturer of components for central heating systems including manual valves, motorised valves and connectors.


Sealing Challenge

Initially the customer used operators to create the individual absorbent pads by layering the materials and manually sealing them with hot seal technology.

This was time consuming and costly, so they commissioned a purpose built machine for their production line to automate the process.

Ceetak designed the QPH module of the machine for the cross seal phase but the customer was using Ultrasonic welding technology for the second phase to create the side seals.

They found this method of sealing to be problematic and they were not achieving the desired results.

Ceetak Solution

We supplied a moulded version of the seal in a new material; a glass fibre and PTFE filled acetal. This improved the wear properties and also provided a high integrity finish to allow smooth movement within the valve. We also adapted the surface flatness to provide a better seal and improve the sealing integrity.


The new design sealed effectively and the customer was pleased with the overall savings made per valve.

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