Rated Pressure
It is stated without a unit quantity. Its numerical value states the permissible working gauge pressure in bar at a temperature of 20°C (68°F) to which a component or specified material may be subjected. In the field of pump technology, it is common to use pressure ratings according to DIN 2401 for the range from PN 1.6 to PN 200.
Preferential designation for pressure ratings are 1.6; 2.5; 4; 6; 10; 16; 25; 40….