6 Commissioning/Start-up/Shutdown
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6.3 Shutdown
6.3.1 Measures to be taken for shutdown
During prolonged shutdown periods, ensure that the following conditions are met:
1. Drain fluids which change their physical condition due to changes in
concentration, polymerisation, crystallisation, solidification, etc. from the piping.
2. If required, flush the piping with the valves fully opened.
6.3.1.1 Valve with lever
1. Disengage the locking device in the upper part of the yoke. Move the lever in
closing direction as required and lock in position with the locking device.
6.3.1.2 Valve with manual gearbox
Turn the handwheel up to the stop in closing direction. Check on the position
indicator fitted on top that the valve is actually closed.
6.3.1.3 Valve with electric actuator
1. Disconnect the equipment from the power supply.
6.4 Returning to service
For returning the equipment to service, observe the sections on commissioning/start-
up and the operating limits (
In addition, carry out all servicing/maintenance operations before returning the valve
to service. (
Summary of Contents for BOAX-B
Page 1: ...Butterfly Valve Installation Operating Manual ...
Page 49: ......