Burkert Type 8640 - Manual (Page 107)

107
Pneumaticbasemodule
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+S,
• An integrated P shut-off is also available for the modules MP11.
MP11 MP12
D6 D8
- G 1/8"
D 1/4" NPT 1/8 "
- D6*
M7 -
- M7*
- D 1/4"*
* Special design 3-fold module with 10 mm valves
21.2. 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 8640