Flowserve Torex butterfly valves - Manual (Page 2)

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 cor-
responds to the valve length, including gaskets.
The valve must not be used for drawing together or alig-
ning incorrectly run pipes (see Fig. 2).
Wrong installation Correct installation
Fig.2.
NAF-Torex valves can be installed in any position,
regardless of the direction of flow. However, we
recommend that, if installed in a horizontal run of pipe,
the valve should be mounted with the shafts horizontal,
in order to prevent the accumulation of dirt and other
impurities around the shaft ends.
The butterfly valve body is marked with an arrow which
indicates that best tightness thereby that the differential
pressure gives an additional torque in the closing
direction while a differential pressure towards the plane
side gives an extra torque in the opening direction.
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.
Ensure that the valve is installed so that the connected
pipe ends do not obstruct the free movement of the disc
when the valve is operated.
The pipes should be supported on each side of the
butterfly valve, in order to relieve the valve of loads and
avoid vibrations.
5. Flange gasket
Gaskets to the dimensions specified in SS 359, DIN 2690
or ANSI B 16.5, 1988, Table E1, Figure E2, Class 150 can
be used.
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.
For other information concerning starting up, see
”Instructions for valve positioners” Fi 41.82A.
Ensure that the pipe ends align and have the correct
distance
7. List of materials and spare parts
Item Qty Part Material Sealtype
1 1 Body EN 1.4408/CF8M
2 1 Disc EN 1.4408/CF8M
3 1 Gland cover EN 1.4408/CF8M
4 1 Stem, upper EN 1.4460
5 1 Stem, lower EN 1.4460
6 1 Clamp ring
DN >250 EN1.4408/CF8M
DN<=250 EN1.4436/
AISI316
7 1 Retaining EN1.4436
8* 1 Gasket Graphite
9* 1 Gasket Graphite
10* 1 Seat ring Inconel 718 05-07,17
11* 1 Seat ring EPDM 66
12* 1 Seat ring FPM 55
14* 1 Seat ring PTFE carbon reinforced 85,86,8A,8B
15*
1)
1 Clamp ring
DN >250 EN1.4408/CF8M
DN<=250 EN1.4436/
AISI316
16* 1 O-ring EPDM 06,66,86
17* 1 O-ring EPDM 06,66,86
18* 1 O-ring FPM 05,55,85
19* 1 O-ring FPM 05,55,85
20* 1 Backing ring PTFE
21* 1 Boxpacking Graphite 07,17
22 1 Cup spring EN1.4310 0B, 8B
23 1 Gland cover EN 1.4408/CF8M
24A 1
Boxpacking Zebra-
CL™
V-ring PTFE 0A, 8A
24B 1 Boxpacking Safeguard V-ring PTFE liveloaded 0B,8B
26 1 Stem bearing Metaloplast
27 1 Stem bearing Metaloplast
28 2 Screw A4
29 2 Nut A4
30 2 Screw A4
31 2) Screw A4
37 1 Washer Metaloplast
1) Clamp ring item15 must be included if the valve is to be
converted from some other type of seat to a PTFE seat ring.
2) Quantity depending on dimension.
*) Recommended spare parts.
Other material combinations are available to order - consult your NAF representative.