Valve Design - Flowserve NAF ProCap User Instruction

NAF ProCap Capping Valve User Instruction – FCD NFENIM4155-00-A4 11/18
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Valve design

The NAF ProCap Capping Valve is intended to be used in batch digesters. The valve is
mounted to the top flange of the digester and it automates the filling of wood chips
into the digester. During the cooking sequence, the valve is closed and gives a tight
seal to avoid gas/media leakage from the digester.
The valve shall be mounted to the digester top flange using the lower flange
connection of the valve. The chip chute can be connected to the ProCap valve using
the bolt pattern in the clamping ring on the top side of the valve.
The unique design of the ProCap is based on a ball sector which is lifted and lowered
from the seat by a lifting mechanism. This lifting mechanism is an eccentric hub which
is operated by a separate, smaller actuator.
The main parts of the complete automated ProCap, seen in Figure 1, are:
• NAF ProCap valve, including a safety locking device, the "jammer".
• NAF Turnex (big) pneumatic actuator, for the opening/closing of the valve
• NAF Turnex (small) pneumatic actuator, for the lifting/lowering of the ball sector
• Limit switches
There are also several optional devices available. We strongly recommend to use these
in order to facilitate the installation, maintain a high tightness and minimize
maintenance. These are the main optional devices:
Figure 1: ProCap including actuators, jammer and
limit switches
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