Flowserve Valtek Mark 10 Survivor Control Valves User Manual
Page 18
Valtek Mark 10 Survivor Control Valves FCD VLENIM0036-05 – 07/09
18
5.2.9.10. Stroke the valve open. Turn the plug back into the actuator stem one quarter turn.
This will ensure that the plug will not contact the seat during operation.
5.2.9.11. Remove the seat ring from the body. Set and tighten the stem clamp.
5.2.10. Valves with separate seats (and no seat ring bolts)
5.2.10.1. Place a flange gasket, seat ring and finally seat ring gasket onto the downstream
pipeline.
5.2.10.2. Retract the valve plug and carefully lower the body/actuator assembly onto the seat
ring and gasket.
CAUTION:
a
Be careful to not strike the plug head against any object during this process.
5.2.10.3. Insert the upstream flange gasket, flange and piping. Slowly stroke the valve to its
closed position to center seat ring in pipe line. Install the flange bolting and tighten
per industry standards.
5.2.11. Valves with bolt on seats
Just before installing the valve in line follow these steps to center the seat ring:
5.2.11.1. Place the valve in an upright position. Place the seat ring and seat gaskets into the
valve body.
5.2.11.2. Slowly stroke the valve to its closed position. Stroke the valve several times to center
the seat ring. Retract the plug and tighten the seat ring bolting.
5.2.11.3. Take care not to bump or move the seat ring during assembly into the line. If the seat ring
is moved during installation, remove the valve and repeat steps 5.2.12.1 to 5.2.12.1.2.
Table I: Common Packing Lubricants
Lubricant
Manufacturer
Temperature Range
Description / Applications
°F
°C
Krytox
E.I. DuPont
-5 to 550
-20 to 287
Fluorinated general purpose grease;
handles common liquids and gases;
good lubricity in harsh mediums;
nonflammable, chemically inert;
won’t harm plastic or metal parts
GP-460
Acheson
32 to 1000
0 to 537
Anti-seize lubricant containing high
purity graphite in petrolatum.
Table II: Suggested Bonnet Bolting Torque Values
Bolt Size (in.)
Nut/Stud Material
Carbon Steel
Stainless Steel
ft-lb, ±10%
N m, ±10%
ft-lb, ±10%
N m, ±10%
5
/
8
80
108
50
68
3/4
140
190
90
122
7
/
8
230
312
150
203
1
350
475
220
298
1
1
/
8
510
691
330
447
1 1/4
730
990
460
624
1
3
/
8
990
1342
630
854
1 1/2
1320
1790
840
1139