Flowserve Trunnball - Manual (Page 2)

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 diffi cult damages
during operation. See Fig. 2.
Wrong installation Correct installation
Fig. 2. Ensure that the pipe ends align and have the
correct distance
NAF-Trunnball valves can be installed in any position
and with optional fl ow direction.
However, we recommend that, if installed in a horizontal
run of pipe, the valve should be mounted with the stem
pointing vertically upwards. If the valve is installed in a
vertical run of pipe, the body half (2) according to fi g. 3
should be at the top to enable the ball and the seat ring to
be replaced without the need for removing the valve from
the pipework.
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 1988, Table
E1 Figure E2, SS 359 or DIN 2690 are recommended.
6. Starting up
Before starting up, fl ush 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 fl ushed 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 No. Qty. Part Material
1 1 Body EN 1.4408/CF8M
2 1 Body EN 1.4408/CF8M
3 1 Ball hard chrome EN 1.4408/CF8M/Hcr
4 2 Seat ring Alloy 6
5 1 Stem, assembly EN 1.4460
6 1 Circlip Spring steel
7 1 Backing ring PTFE
8 1 Upper lid EN 1.4436
9 4 Screw A4
11 1 Packing box PTFE/PTFE+25%C
12 1 Bushing PTFE+1.4401
13 1 Anti-friction washer EN 1.4436
14 1 Sealing ring PTFE
15 10 Screw A4-80
16 12 Nut A4
17 2 Screw A4-80
18 2 Key A4
19 1 Ball EN 1.4408/CF8M
20 1 Ball Alloy 6
21 2 Seatring EN 1.4436/PTFE+25%C
22 1 Bearing PTFE+1.4401
23 2 Trunnion plate EN 1.4470
24 2 Spring ASTM A316
25 2 Sealing ring PTFE+15%Graphite
26 1 O-ring FPM
28 1 Spring ASTM A316
29 1 Supporting ring Spring steel
30 1 Washer A4
31 1 Supporting ring PTFE
32 2 O-ring EPDM
33 2 Bushing PTFE reinforced carbon
34 1 Sliding washer PTFE reinforced carbon