Georg Fischer DIASTAR SIX Manuel D'utilisation D'origine page 30

5.2 FC-mode / Faile-safe-to-close
In the non-operative state, the valve is closed with spring force. When the actuator is
pressurised with the control medium (bottom connection), the valve opens. When the
control medium escapes, the valve is closed via spring force.
Pressure ranges and types
Information
• Please consider the pressure­temperature diagrams in the Planning Fundamentals
• Shown pressure ranges depend on the valve body material
Six FC
Type
Valve body
PVC-U, PVC-C, ABS, PP-H
material
Diaphragm
EPDM PTFE
20DN15...
6 bar ---
50DN40
63DN50 6 bar ---
Working pres-
→ ----
sure
Air connection
Solenoid pilot valve and matching connection thread
3/2-way solenoid valves are used to control single acting actuators (FC). They are moun-
ted either directly to the actuator via a banjo bolt or via a battery mounting plate or valve
cluster, as required.
FC mode of operation with a 3/2-way solenoid valve for bottom connection
Nominal
diameter
20DN15
25DN20
32DN25
40DN32
50DN40
63DN50
30
Ten FC
PVC-U, PVC-C, ABS, PP-H,
PP-n, PVDF, PVDF-HP
Control
pressure EPDM PTFE
max.
6 bar 10 bar 10 bar 6 bar
6 bar 10 bar 6 bar 6 bar
→ →
Six (FC)
G1/8"
G1/8"
G1/8"
PVC-C, ABS, PP-H, PP-n
Control
pressure EPDM PTFE
max.
10 bar 10 bar 6 bar
10 bar 10 bar 6 bar
→← →←
Ten (FC)
G1/8"
G1/8"
G1/8"
Sixteen FC
PVC-U, PVDF,
PVDF-HP
Control
pressure EPDM PTFE
max.
16 bar 16 bar 6 bar
16 bar 10 bar 6 bar
→ →
Sixteen (FC)
G1/4"
G1/4"
G1/4"
Control
pressure
max.