What is the pH-value?

What is the pH-value?

The pH-value represents a measure of the neutrality, acidity or basicity of an aqueous solution.

Pure water is neutral and has a pH of 7. The range below 7 is described as acidic and that above as basic or alkaline.

A strong acid has a low pH. 

A value of 5.5 is unlikely to cause skin irritation. 

What importance does the pH-value have for the valves?

Depending on the pH-value of the liquid used, the material of the valve is selected: 

• 0-6: stainless steel

• 7: brass

• 8-14: stainless steel