The service conditions are the conditions under which a valve operates in the plant. While choosing a valve for a specific operation, the service conditions should be known in order to make an informative decision. The minimum service conditions to choose a valve are as follows:
P = Pressure
T = Temperature
M = Medium
A = State of Aggregate
For severe conditions and for control applications, further information about the service conditions (e.g. differential pressure, velocity, flow rate, operating cycles, etc.) are essential to choose the correct valve.