Burkert Type 8650 - Manual (Page 72)

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9. REPLACING A VALVE
DANGER!
Risk.of.injury.due.to.pressure.change!
When the valve is removed, only the P-channel is shut off. As a result, the pressure at the service outputs A or
B is reduced. A connected actuator is therefore also depressurized and may move as a result.
• If there is a fairly large volume on the actuator side, provide a shut-off option for the service ports to prevent
the actuator from moving.
9.1. Installation instructions
Before replacing the valve, ensure that the relevant equipment is in an electrically safe state.
If the respective valve position does not feature a P-shutoff, first depressurize the system.
If the valves mounted on modules with P-shutoff are changed under pressure, only a maximum of four valves may
be removed at the same time.
When the valve is being removed, a relatively large amount of air is initially released, as the P-shutoff cannot close
until the required pressure difference is reached. However, as the automatic shut-off considerably reduces the
exhaust air, only a low residual leakage remains when the P-shutoff is closed.
9.2. Installation
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When installing the valve, ensure that the seal has been inserted correctly.
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Tighten the valve to the tightening torques indicated in the operating instructions.
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When installing the valve, ensure that the service ports are also pressurized in the corresponding rest position
of the valve until it switches over. As a result, a connected actuator can perform a movement according to the
pressurization.
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Ensure that these actuator movements cannot cause any damage or unwanted operations in the equipment.
Type 8650
english
Installation