Burkert Type 8644 - Manual (Page 51)

51
Structureandfunctionofthemodules
Valves Operating principle Operation Width type
3/2-way C (NC) Internal control air 16 6526
D (NO)
C (NC) Control assist air
(External)
D (NO)
C - vacuum (NC)
5/2-way H Internal control air 10 6525
Control assist air
(External)
Internal control air 16 6527
Control assist air
(External)
5/3-way L Lock middle
position
Internal control air 10 0460
N Deaerated
L Lock middle
position
16 0461
N Deaerated
5/2-way impulse H Internal control air 10 0460
16 0461
NoTE!
Valves with control assist air
If valves are used with control assist air, the exhaust air escapes from the pilot valve into the environment. Valves
with control assist air cannot be combined on the valve cluster with valves with internal control air, as the con-
nection X (see Chapter “7.2. Connection modules”) is used differently.
Valves 6524 and 6525 (Exception: Type 6524 2 x 3/2-way)
The assembly of the valve cluster Type 8644 with the valves 6524 and 6525 is authorized for use in Zone 2
in accordance with II 3 G Ex nA II T4 with the number PTB 02 ATEX 2048.
Restrictions for use in Zone 2
CAuTIoN!
For valve types 6526 and 6527 the valve switch-off time restriction T
OFF
≥ 0.2 s must be observed for use in
Zone 2 with temperature class T4 under the following conditions:
• at quick switch-on cycles (valve switch-on time T
ON
< 3 s)
• maximum ambient temperature of +55° C
• maximum permitted overvoltage of U
Nominal
+ 10 %
english
Type 8644