Nominal Size Selection Method; Specifications Selection Chart; Safety Valve Setting Pressure Chart; Characteristics Chart - Yoshitake GP-2000 Installation & Operation Manual

5. Nominal Size Selection Method

5.1 Pressure reducing valve specification selection chart

5.2 Safety valve setting pressure chart

5.3 Characteristics chart

(1) Flow rate characteristics chart
(2) Pressure characteristics chart
Refer to the above selection chart to select
the most appropriate pressure reducing
valve. Find the point of intersection of
inlet pressure (P
(P ). When the point of intersection is
2
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).
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).
• Shut-off pressure raise : 0.02 MPa or less
• Offset : 10% or less of setting pressure
(Minimum value: 0.02MPa)
Reduced pressure is set to 0.14 MPa
when inlet pressure is 1.75 MPa. The
chart indicates a variation in reduced
pressure when the inlet pressure is
changed from 0.2 to 2.0 MPa.
-7-
) and reduced pressure
1
■EPDT-014f■