Pressure Measurement & Control


Material selection of mechanical pressure switches

May 2021 Pressure Measurement & Control

For different applications, the careful and application-oriented selection of the materials of the parts is a key factor for selecting suitable mechanical pressure switches for industrial machines. The process medium and medium temperature are also critical factors for an application. It is important to evaluate the application before selecting a suitable and functional mechanical pressure switch.

A mechanical pressure switch is designed with process connection, measuring element, switch contacts, electrical connection and set point adjustment screw. The commonly used material for the case and wetted parts (process connection) is galvanised steel or brass. For humid working environments, stainless steel (for example, ANSI 303) is the best choice. If the plant manufacturer wants to reduce the cost, steel with zinc nickel coating can be a good solution.

One of the core parts of a mechanical pressure switch is the measuring element. For these elements elastic diaphragms or stainless steel pistons are commonly used. The diaphragm is designed for vacuum or low pressure ranges up to 16 bar, whereas the piston is suitable for higher pressure ranges up to 350 bar. For different media and medium temperatures, a wide range of materials to meet the different requirements is available. For example, nitrile butadiene rubber (NBR) is suited for air, hydraulic oil and medium temperatures from -20°C to 80°C. If the medium is water, ethylene propylene diene monomer rubber (EPDM) is a better solution. For medium temperatures up to 100°C, fluorosilicone rubber (FVMQ) is a solution to fulfil the high-temperature requirements.

WIKA offers the right pressure switch for each application.


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