Overview
The Dorot pressure reducing valve is of the balanced seat type. The inlet pressure, when acting on the two openings A and B with the same section, is compensated, and does not exert any force on the pin-plug system when the degree of valve opening changes.
Two forces act on the diaphragm: The outlet pressure creates a force that tends to close the plug, and is opposed by the spring mechanical force, that tends to open the plug. This results in the pressure reducing valve acting like a balanced seat type, where the outlet pressure is almost unaffected by variations in inlet pressure.
