Flowserve NAF-Duball ball valves - Manual

1
NAF-Duball ball valves
Maintenance and installation instructions
List of spare parts
Fi 41.61(4)GB
08.01
Contents
SAFETY
General 1
Lifting 2
Receiving inspection 3
Installation 4
Flange gaskets 5
Starting up 6
List of materials and spare parts 7
Ordering of spare parts 8
Maintenance 9
To remove the valve from the pipework 9.1
To inspect and replace the ball and seat rings 9.2
Valves with PTFE seat rings 9.3
T-version 9.4
Valves with chromium-plated ball and
seat rings in alloy 6 9.5
Valves with ball in alloy 6 and seat ring 9.6
To change the upper stem seal 9.7
To change the stem bearing and seal 9.8
To inspect and replace the packing of
graphite type 9.9
Fitting the actuator to the valve 10
SAFETY
- Assess all the risks to eliminate the risk of personal
injury and material damage. Read these instructions
thoroughly!
- Always use the necessary protective equipment
and comply with applicable safety directives when
working with hazardous or hot/cold medium.
- Never operate a valve without first ensuring that there
is no risk of crush injuries. The risk is highest with
automatic valves.
- Take necessary safety precautions to prevent
unintentional manoeuvre - i.e to atmosphere.
- Never dismantle a valve or part of a valve without
ensuring that the line is free of pressure and any
content.
- Ball valves must always be dismantled in semi-open
position to avoid trapping pressure and medium.
- Always check that the valve type and material is
suitable for its intended use. This applies especially to
highly oxidising and corrosive medium. Observe also
the risk of erosion and explosion as well as decaying
medium. If in doubt, always request a written
recommendation from NAF AB.
1. General
The instructions and list of spare parts in the succeeding
are applicable to NAF-Duball ball valves in accordance
with catalogue sheet Fk 41.61GB.
The product codes of NAF-Duball valves are as follows:
888225-XXXX 1) 888226-XXXX 1) 888227-XXXX 1)
888425-XXXX 1) 888426-XXXX 1) 888427-XXXX 1)
888525-XXXX 1) 888526-XXXX 1) 888527-XXXX 1)
888625-XXXX 1) 888626-XXXX 1) 888627-XXXX 1)
888725-XXXX 1) 888726-XXXX 1) 888727-XXXX 1)
888295-XXXX 1) 888296-XXXX 1) 888297-XXXX 1)
888495-XXXX 1) 888496-XXXX 1) 888497-XXXX 1)
888595-XXXX 1) 888596-XXXX 1) 888597-XXXX 1)
888695-XXXX 1) 888696-XXXX 1) 888697-XXXX 1)
888795-XXXX 1) 888796-XXXX 1)
1) XXXX=Size
2. Lifting
All lifting must be carried out on the
valve itself and not on the actuator.
The joint between the valve and
the actuator is designed principally
for carrying the operating torque
and the deadweight of the actuator
(see Fig. 1).
Fig. 1. Lifting of the valve
3. Receiving Inspection
All valves leaving our works 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 completely ready for direct installation in
the pipework. However, in view of damage that may have
occurred during transport, it is advisable that receiving
inspection be carried out, if possible.
We would 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
regarding possible damages.