At what pressure does a steam control valve with a 5 - 10 psig range deliver the maximum amount of steam?

In the context of a steam control valve operating within a specified pressure range, the maximum amount of steam delivery occurs at the upper limit of that range. In this case, a control valve designed to operate between 5 to 10 psig means that it can modulate based on the needs of the system between these two pressure points.

As the demand increases, the valve will adjust to allow more steam through to meet that demand. At the upper limit of 10 psig, the valve is fully open, allowing the maximum flow rate of steam because it is not limited by a lower pressure but rather optimized for high output. Therefore, when the system reaches this pressure, it indicates the valve's capacity to deliver steam is at its peak, making it the correct choice for when the maximum amount of steam is delivered.

Lower pressures, such as 5 psig or 7.5 psig, would restrict the flow compared to 10 psig, as those pressures do not maximize the valve's opening to deliver steam efficiently to the system. A pressure of 12 psig is outside the specified range and typically would not apply in this scenario. Hence, the upper end of the range, 10 psig, is indeed where the valve delivers