NAF Duball DL Ball Valves NFENIM4163-00-A4 05/17
USER INSTRUCTIONS
NAF Duball DL Pocket Valve
FCD NFENIM4163-00-A4 05/17
Installation
Operation
Maintenance
Experience In Motion
1
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NAF Duball DL Ball Valves NFENIM4163-00-A4 05/17
Contents
SAFETY 2
1 General 2
2 Lifting 3
3 Receiving Inspection 3
4 Installation 3
5 Operating sequence 4
6 Commissioning 6
7 Operation 6
8 Bill of Materials and recommended spare part kits 7
9 Ordering of spare parts 8
10 Maintenance 8
10.1 Removing the valve from the pipework 8
10.2 Disassembling the valve for inspection and replacement of ball,
seats and stem packing 8
10.3 Reassembly of the valve 9
10.4 Replacing seat rings 9
10.5 Replacing the Pocket ball 10
10.6 Replacing the stem packing 10
11 Fitting an actuator to the Pocket Valve 11
SAFETY
• Assess all risks to eliminate the possibility of personal
injury and material damage. Read these instructions
thoroughly.
•
Always use the necessary protective equipment and comply
with applicable safety direc
hazardous or hot/cold media.
• Never operate a valve without first ensuring there is no risk
of crush injuries. The risk is highest with automated valves.
Take necessary safety precautions to avoid unintentional
stroking of the actuator / valve.
• Never dismantle a valve or part of a valve without ensuring
the line is free of pressure and media.
•
Ball valves must always be dismantled in the semi-open
position to avoid trapping pres
2
• Always check that the valve type and material is suitable for
its intended use. This applies especially to highly oxidizing
and corrosive media. Observe also the risk of erosion or
explosion, as well as decaying medium. If in doubt, always
request a written recommen
tives when working with
sure and media.
dation from Flowserve.
1 General
This instruction provides necessary information for the correct
handling of the NAF Duball DL Pocket Valve. For additional equipment
used together with the valve, please refer to their corresponding
instructions.
If you have any doubt about the correct use and handling of a specific
version of NAF Duball DL Pocket Valve, please contact your Flowserve
representative.
The instructions and list of spare parts in this document are applicable
to the NAF Duball DL Pocket Valve in accordance with our Technical
Bulletin NFENTB4163.
As the NAF Duball DL Pocket Valve is a special applications valve,
special terms and conditions may apply. Please refer to specific
purchase.
NAF Duball DL Ball Valves NFENIM4163-00-A4 05/17
2 Lifting
All lifting must be carried out on the valve itself and not on the
actuator. The mounting connection between the valve and the actuator
is designed principally for carrying the operating torque and the
deadweight of the actuator and is not designed to support the weight
of the valve. See Figure 1.
4 Installation
Before installing the valve, please ensure that:
• The pipework is free from impurities
• The pipe end connectors between which the valve is to be installed are
parallel and are correctly aligned
• The distance between the pipe ends correspond to the valve length,
including gaskets.
The valve must not be used for pulling together or aligning incorrectly run
pipes as this will cause improper loads on the valve and pipe which could
lead to severe problems during operation. See Figure 2.
Incorrect installation
Correct installation
Figure 1: Schematic lifting of a valve with mounted actuator. Note that
the final lifting of the valve into a vertical pipe requires different lifting
points.
3 Receiving Inspection
All valves leaving our facility are inspected and tested in accordance
with the relevant requirements or in accordance with the special
provisions specified by the purchaser. Valves equipped with actuators
are subjected to functional testing and are adjusted in such a manner
that every unit is ready for direct installation in the pipework. However,
NAF always recommend that a receiving inspection is to be carried out.
We suggest the following inspection procedure:
• Check that the valve delivered is correct in terms of type, size,
equipment, etc.
• Examine the valve, actuator and valve positioner for possible damage
that may have occurred during transport.
Figure 2: Ensure that the pipe ends align and have the correct gap
A typical application for the NAF Duball DL Pocket Valve is when it’s installed
in the reject pipe of a sand separator. See Figure 3. Make sure that the valve
is mounted in the correct flow direction as indicated by the flow arrow on
the valve body.
NAF strongly recommend that a Duball DL valve is installed upstream of
the Pocket Valve. This valve is to be open in normal operation and only shut
when the Pocket Valve is to be inspected/serviced.
If not supplied by NAF, two on/off valves should be installed on each of
the flush connections (1 & 2 as shown in Fig. 3) in close proximity to the
Pocket Valve. The Pocket Valve and the on/off valves should be operated as
described in Section 5, “Operating sequence”.
The pipes should be supported on each side of the valve in order to
relieve the valve of unnecessary loads and avoid vibrations.
The actuator used on the Pocket Valve should be supported in order
not to introduce unnecessary loads and to minimize any potential
influence from vibration.
Locate the valve so it will be easily accessible for inspection and
service.
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3
Outlet with
liquor
NAF Duball DL Ball Valves NFENIM4163-00-A4 05/17
Inlet with liquor
Duball DL
ball valve
Body flushing
connection 1
Figure 3: Mounting of the Pocket Valve in a Sand Separator application
5 Operating sequence
The NAF Duball DL Pocket Valve is operated by the following sequence:
1. The Pocket Valve is in “Filling mode”. Sand/debris is collected in the
Pocket ball.
2. When the Pocket ball volume is approximately 50% full (volumes for
the different sizes can be seen in Table 1) the “Discharge sequence”
(emptying) is initiated and CCW (counterclockwise) rotation of the
Pocket ball starts. Connection 1 is set to “ON” (open) and body flushing
starts. This flushing inhibits sand/debris to be collected in the body of
the Pocket Valve. Body flushing at connection 1 should remain “ON”
until the Pocket Ball has completed a full discharge sequence.
4
3. CCW rotation continues from 0 to 140 degrees.
4. Final Discharge position is reached at 140° and rotation stops.
Connection 2 is set to “ON” (open) and ball flushing starts. It is
Pocket valve
Ball flushing
connection 2
Drain/mud/sand
recommended that the Pocket ball remains in this position for at least
10 seconds. However, due to the nature of the debris in the Pocket ball,
a longer flushing may be needed.
5. Discharging is completed and connection 2 is set to “OFF” (close) and
ball flushing stops. The Pocket ball starts CW (clockwise) rotation back
to the open/fill position.
6. CW rotation continues from 140 to 0 degrees.
7. The “Discharging sequence” is now completed and rotation stops. Body
flushing from connection 1 is set to “OFF” (close) and stops. The valve
is now back in “filling mode”.
A schematic figure of the operating sequence can be seen in Figure 4.
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