Installation; Mounting Of The Procap On The Digester - Flowserve NAF ProCap User Instruction

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

5 Installation

5.1 Mounting the ProCap valve on the digester
The NAF ProCap capping valve is intended to be used for cooking of wooden chips in
a batch digester. The valve shall be mounted to the digester top flange using the lower
flange connection of the valve.
During the lifting of the valve to its position on the digester top, please make sure
to follow the safety precausions in Section 4!
When installing the valve to the digester, make sure that the valve is installed in a position
enabling the actuators and other equipment to be removed without the need to
remove the valve from the digester.
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. If a water mirror should be used (see Section
5.5), the water mirror should be connected to the top of the valve and the chip chute
connected on top of the water mirror. We recommend to use an inspection hatch
located at least 400 mm/16" above the valve.
If the ProCap is operated directly from the DCS without the Local Control Box and the
Pneumatic Cabinet, the solenoid valves used are normally of the type 5/2 function for
all the pneumatic parts; big actuator, jammer and small actuator. We recommend:
o The jammers (5/2 function, mono stable, fail safe position= jammers
locked)
o Valve open/close action (5/2 function, bistable)
o Ball sector up/down action (5/2 function, bistable)
Note: It's important that the valve isn't opened or closed with the ball sector in the upper
position. Therefore we recommend that a bistable 5/2 solenoid valve is used for the
actuation of the smaller actuator. This will prevent the sector from being in the wrong
position after a power failure.
Note: During the operation of the ProCap valve it is mandatory that the valve can't be
opened before the pressure in the digester has dropped to zero or almost zero.
Therefore, the pressure in the digester must be used to interlock the opening of the
valve. Pressure switches may already exist, sitting in the digester itself, or can be
attached using the DN80 PN 25 connections on the valve body. The valve is delivered
with both these connections sealed with two blind flanges.
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