Table of Contents
Advertisement
4. Nominal Size Selection Method
4.1 Pressure reducing valve specification selection chart
Refer to the above selection chart to select the most appropriate pressure reducing valve.
Find the point of intersection of inlet pressure(P
of intersection is within range(A), reduce pressure in two stages. When within range (C),
maximum performance cannot be obtained. When reducing pressure in two stages,
maximize the distance between the valves (at least 3 m).
4.2 Safety valve setting pressure chart
This chart is for setting the safety valve (for alarms) used for steam pressure reducing
valves.
Determine the reduced pressure of pressure reducing valve. Find the intersection point (A)
with the chart curve. Next, find point (B) by proceeds horizontally from point (A) to the left
until the 'Setting pressure of safety valve' axis. The setting pressure of the safety valve
should be higher than the pressure of the point (B).
) and reduced pressure(P
1
-7-
). When the point
2
■EPDT-098a■
Advertisement
Table of Contents
