EB 8140 EN
11
Design and principle of operation
the valve and by a radial shaft seal (4.1) at
the actuator.
3.1 Fail-safe action
The fail-safe position of the valve upon sup-
ply air (signal pressure) failure is determined
by how the piston and actuator spring are
arranged in the pneumatic actuator.
Fail-close (FA/NC)
The actuator spring closes the valve upon air
supply failure. The valve opens when the sig-
nal pressure increases.
Fail-open (FE/NO)
The actuator spring opens the valve upon air
supply failure. The valve closes when the sig-
nal pressure increases.
3.2 Technical data
The nameplate provides information on the
control valve version (see section 2.1). More
information is available in Data Sheet
u
T 8140.
Table 1:
Technical data
Valve sizes
DN 15 to 80
Material
Cast iron EN-GJL-250 (EN-JL1040)
Type of connection
Flange
Nominal pressure
PN 16
Seat-plug seal
Soft seal
Characteristic
Quick-opening
Compliance
Actuator
30 cm² (Ø=63 mm) · 60 cm² (Ø=90 mm) · 120 cm² (Ø=125 mm)
Permissible signal pressure
Minimum
à
According to section 3.4 · Maximum 8 bar
Signal pressure connection
G ¼
Temperature range
Perm. medium temperature
–10 to +180 °C
Perm. ambient temperature
–10 to +60 °C
Permissible flow velocity
Max. velocity at the valve
outlet
Liquids: 3 m/s · Gases: 0.3 Mach
