Burkert Type 8644 - Manual (Page 52)

52
Structure and function of the modules
procedure when replacing a valve
CAuTIoN!
Only one valve may be removed at the same time. •
During removal, observe that only the P channel is shut off! This means that a pressure on the working out- •
puts A or B is released when the valve is removed. This also means that a connected actuator is also depres-
surized and a movement may be triggered as a result.
If there is a larger volume on the actuator side, attach a shut-off option for the working connections to prevent •
the actuator from moving.
When the valve is removed, a relatively large amount of air is initially blown into the open for functional reasons, as
the P shut-off cannot close until the required pressure difference is reached. However, as the automatic shut-off
reduces the exhaust air significantly, only a residual leakage remains when the P shut-off is closed.
When installing the valve, ensure that the seal is inserted correctly.
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Install the valve at the tightening torques indicated in the operating instructions.
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When installing the valve, ensure that the working connections are also pressurized in the corresponding rest
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position of the valve until it is switched over. The pressurization may cause a connected actuator to move.
Ensure that these movements of the actuator do not cause any damage or unwanted actions in the system.
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Before changing the valve, we recommend bringing the system into an electrically safe basic state.
Typ 8644
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