Burkert Type 8640 - Manual (Page 108)

108
Pneumaticbasemodule
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.
CAUTION!
Danger from loose deposits or components!
When releasing a valve under pressure with P shut-off deposits or aged constituents could be ejected.
• Use a suitable pair of protective glasses when replacing valves.
Before changing the valve, we recommend bringing the system into an electrically safe basic state.
english
Type 8640