Flowserve NAF-Duball ball valves - Manual (Page 2)

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4. Installation
Before installing the valve, ensure that the pipework is
free from impurities, that the pipe ends between which
the valve is to be installed are parallel and are correctly
aligned, and that the distance between the pipe ends
corresponds to the valve length, including gaskets. The
valve must not be used for drawing together or aligning
incorrectly run pipes as this will cause needless loads on
the valve and pipe which may lead to difficult damages
during comming operation. See Fig. 3.
Wrong installation Correct installation
Fig. 3. Ensure that the pipe ends align and have the
correct distance
NAF-Duball valves can be installed in any position and
for either direction of flow.
However, we recommend that, if installed in a horizontal
run of pipe, the valve should be mounted with the stem
pointing vertically upwards.
The pipes should be supported on each side of the
valve, in order to relieve the valve of loads and avoid
vibrations.
Locate the valve so that it will be easily accessible for
inspection and service, particularly if the valve is equipped
with an actuator and a valve positioner.
5. Flange Gaskets
Gaskets with sizes according to ANSI B16.5, Table E1
Figure E2, SS 359 or DIN 2690 are recommended.
6. Starting up
Before starting up, flush the pipework - with all valves
in the open position - so that any impurities that may
damage the sealing surfaces of the valve and impede its
operation will be flushed away.
See also Fi 41.82 - Instruction Manual for NAF valve
positioner giving useful hints for starting up.
7. List of Materials and Spare Parts
Item Qty Part Material
1 1 Body EN 1.4408/CF8M
2 1 Body EN 1.4408/CF8M
3 1 Ball EN 1.4408/CF8M
4* 2 Seat ring PTFE carbon reinforced 10%
5 1 Stem assembly EN 1.4460
6 1 Circlip Spring steel
7 1 Backing ring PTFE
8 1 Washer A4
9 ** Screw A4
10* 1 Backing ring PTFE
11* 2 O-ring EPDM
12* 2 Bushing PTFE carbon reinforced
13* 1
Anti-friction
washer
PTFE carbon reinforced
14* 1 Seal ring PTFE
15 1 Bolt A4
16 1 Nut A4
17 1 Stud A4
18 2 Key Steel
19 1 Ball
EN 1.4408/CF8M hard chrome
plated
20 1 Ball Alloy 6
21 2 Seat ring SS/Alloy 6
22* 2 Seat seal PTFE carbon reinforced
23 1 Gland cover EN 1.4408/CF8M
24* 1 Boxpacking Graphite
25 2 Bolt A4
26 2 Nut A4
27 1 Split ring EN 1.4436
28 1 Ring Alloy 6
29 2 Bushing Alloy 6
30* 1 Seal ring Graphite
31* 2 Seal ring Graphite
32 1 Stem extension EN 1.4460
33 2 Actuator yoke Zink plated steel
34 1 Stop screw A4
* Recommended spare parts
** Qty depends on the DN.
Items 23—34 are for the stuffing box version for 350°C. Material combinations others than
those specified are available to order - consult your NAF representative.