Burkert Type 8644 - Manual (Page 49)

49
Structureandfunctionofthemodules
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.
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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
position of the valve until it is switched over. The pressurization may cause a connected actuator to move.
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Ensure that these movements of the actuator do not cause any damage or unwanted actions in the system.
Before changing the valve, we recommend bringing the system into an electrically safe basic state.
english
Type 8644