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Introduction
B722-20-880 Issue D
The rate of pressure rise cannot be controlled by the manual vent-valve, so if the manual vent-valve is used it must
only be opened after the EXT pump speed has fallen to 50% of full rotational speed.
If a TAV vent-valve is used, but the rate of pressure rise cannot be limited, the vent-valve must only be opened after
the speed of the EXT pump has fallen to 50% of full rotational speed.
Figure 1 - Maximum allowed rate of pressure rise during venting: pressure against time (with the pump initially
at full rotational speed)
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