![]() Full port valves are required for applications in which flow rate and pressure drop are critical considerations and are especially preferred for more viscous media. When fully open, a full port valve will cause little to no pressure drop, which is the difference in media pressure on either side of the valve. This means that a ½” standard port ball valve is designed to fit in an NPS ¾ pipe.įull port valves have low flow resistance, and therefore can act as just another stretch of pipe when fully open. Standard port (or standard bore) valves are meant to fit in the next-smallest pipe size. For example, a 1 ¼” full port ball valve is meant for a NPS 1 ¼ pipe. However, there are two different size classifications for valves.įull port (or full bore) valves have a port, or hole, whose diameter matches that of the pipe it’s in. Valve sizes directly correlate to the diameter of the pipe in which they are placed. Once you know the size classification of your pipes, you will know which size valves you might need. Measure the inside diameter of the pipe across the opening.Consult a pipe sizing chart to determine the nearest DN or NPS value.įinding the size of a female pipe fitting is much simpler, and only requires a ruler and a calculator.Using the ruler, straighten the string and measure from the end of the string to the point of contact. ![]() ![]() Wrap the string around the pipe and mark the point of contact.To measure a male pipe fitting, you’ll need a piece of string, a ruler, and a calculator. If a pipe is unmarked, or you’re not sure of its size, you can determine this using some simple tools. This is because pipes are named and classified based on their “nominal” or “trade” names to simplify things for example, a pipe with an NPS 3 classification might have an inside diameter measuring 3 ⅝ inches. When measured with an accurate ruler, a pipe’s exact diameter might not exactly conform to any DN or NPS size classification.
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