How to read valve size?
Valve Size: The valve pipe size is often simply noted in inches, however, you may also find the pipe size noted with a DN prefix. This stands for “diameter nominal” and the number following the prefix is the valve pipe size in millimeters. The valve size is an integral part of valve selection and application. Basically, the size of the valve determines the flow rate and pressure of a fluid that goes through it within a pipeline. Valve sizes also have an effect on the cost, operating, and maintenance requirements of a pipe system.
Does valve size matter?
Correct valve sizing is crucial for several reasons. We cover some of them below. Limiting pressure drop is an essential consideration; therefore, the valve must be appropriately sized to accommodate the required flow rate while preventing excessive pressure drop or loss within the system. Again, an oversized valve will result in a high stroke count, which over time will wear down your valve trim and packing much faster than it should under normal operation. This can lead to deterioration of the trim, resulting in poor performance and potential environmental issues.