Burkert Type 8644 - Manual (Page 51)

51
Structure and function of the modules
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
pneumatic base module with integrated p shut-off 7.4.2.
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%*.
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The operating pressure range must be between 5 and 7 bar if the P shut-off is used, otherwise there may be
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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
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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.
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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
Typ 8644
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