Solenoid valves are often misapplied as well. Generally, a solenoid valve is required to default to a desired position, referred to as fail-safe, upon loss of power. In the case of a two way valve, either closed or open, or a three way valve, either left port or right port. In some of these cases the process control system will compensate for the one valve operating improperly, but in the event of a power loss the results might be disastrous. Understand and write out precisely what function the valve is to perform.
Material compatibility is critical to the safe operation of a system and personnel safety.
The result of a material misapplication can be catastrophic. Additional expenses for clean up of the chemical spills and fines may also be expected. Every materials manufacturer publishes an easy to use chemical compatibility chart, which takes the guesswork out of specifying compatible materials. Unfortunately, anxious designers are notorious for ignoring the published temperature ratings of valve and seal materials, assuming that they all have a built in safety factor. In a few cases, that's true.