Samson 3374 - Page 24

3-8 EB 3018 EN
Design and principle of operation
Differential pressure across the valve
The minimum required differential pressure Δp
min
across the valve is calculated as follows:
Δp
min
= Δp
restriction
+
(
V
)
2
K
VS
·
Δp
min
Minimum differential pressure across the valve in
bar
Δp
restriction
Differential pressure created at the restriction for
measuring the ow rate in the regulator
V Adjusted ow rate in m³/h
K
VS
Valve ow coefcient in m³/h
·
Table 3-1: Technical data·Valves·All pressures in bar
Type2423 Valve Balanced by a bellows Balanced by a diaphragm
Valve size DN15 to 250 DN65 to 250
Pressure rating PN 16, 25 and 40
Max. medium temperature 150°C
1)
Max. ambient temperature 50°C
Conformity
· ·
1)
Use an intermediate insulating piece (1990-1713) for DN15 to 50 and water temperatures ≥130°C.
Table 3-2: Technical data∙Electric actuators for valve sizes DN15 to 250
Type... Electric Actu-
ator
Fail-safe action: Valve size DN
Actuator stem
extends 15 to 25 32 to 50 65 to 100 125 to 250
5827-N1 –
• – – –
5827-A1 •
5827-N2 –
– • – –
5827-A2 •
5827-N3
–
– – • –3374-11
3374-21 •
3374-15 – – – –
•
3374-25 •