Burkert Type 8644 - Manual (Page 48)

48
Structureandfunctionofthemodules
non-return valve for the vent connections
As certain applications require a functionality with non-return valves, there are also appropriate types for this purpose:
• Without non-return valve,
• Non-return valve in R,
• Non-return valve in R+S,
• An integrated P shut-off is also available for the modules MP11 (2-fold mono and 8-fold mono).
mp11 mp12
D6 D8
D4 G 1/8"
D 1/4" NPT 1/8"
M5 D6*
M7 M5*
- M7*
- D4*
- D 1/4"*
* Special design 3-fold module with 10 mm valves
7.4.2. pneumatic base module with integrated p shut-off
general description
The P shut-off can be integrated in the module for the pneumatic base modules MP11, 2-fold and 8-fold versions.
This option allows a defective valve to be changed under pressure without having to depressurize the complete
valve cluster or system. When the valve is changed by a mechanism, the open cross section is reduced until only
a slight residual leakage occurs.
features and restrictions
If the P shut-off is used, there are some restrictions with respect to the operating data of the complete system:
→
The flow rate of the valves Type 6524 / 6525 is reduced to approx. 60%*.
→
The operating pressure range must be between 5 and 7 bar if the P shut-off is used, otherwise there may be
problems with the P shut-off.
→
As the pressure supply for the pilot valves is not shut off if valves are used with external control assist air, the P
shut-off can be used only in conjunction with the valves with internal control air within the restricted pressure range.
→
The P shut-off can be combined with the integrated non-return valves.
NoTE!
If using the P shut-off base modules, ensure that the pressure supply of the valve clusters is designed with a cor-
respondingly large volume (minimum hose diameter 8/6 mm).
* Mean value from measurements
english
Type 8644