Don’t put too much trust in plastic valves

resin valve
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Plastic valves resist corrosion | Plant Engineering
Type 14 diaphragm valves feature all thermoplastic construction for corrosion resistance in aggressive applications. Val...

Plastic valves are used for corrosive liquids because they are made of a corrosion-resistant material.

However, plastic valves have weaknesses, so you need to carefully consider when to use them.


Resin valves can crack because they are made of resin.

They can crack surprisingly easily when exposed to sunlight and deteriorate, or when they come into contact with hard objects such as tools.

The risk of exposure to sunlight is lower if the valves are placed indoors, but indoor conditions are almost never used in chemical plants.


Resin valves have a chance of leaking.

Because of their high corrosion resistance, leakage from the point of view of corrosion is unlikely to occur.

Leaks in resin valves are due to problems with connection joints and sealing materials.

Methods that are prone to leaks, such as screw joints, are common, and parts that deteriorate easily, such as O-rings, must be used.

Resin valves should be selected carefully due to the risk of leakage and long-term use.


resin pipe