Flowserve Valtek Mark 14 - Manual (Page 12)

Valtek Mark 14 Control Valves FCD VLENIM0115-00 – 06/06
1
7.10 Replace the packing, guides and spacers into the bonnet. The appropriate User Instructions
have detailed instructions for each packing style.
7.11 Place the bonnet into the body, sliding it over the plug stem until it comes to rest on the body
bonnet shelf.
7.12 Refer to Figure 2 and place the bonnet pressure seal into the body and around the bonnet in
the same manner as the seat seal.
7.13 Place the bonnet pressure seal retainer over the bonnet pressure seal.
7.14 Refer to Figure 1 and place the four segmented bonnet retaining rings into their groove with
the side marked “TOP” facing towards the top of the valve.
7.15 Place the bonnet flange into the body until it rests on the body bonnet flange shelf. Align the
flange bolt holes approximately with the bonnet threaded bolt holes.
7.16 Apply thread lubricant compound (Loctite Blue or equivalent) to the bonnet bolts, place
two disk springs in parallel (nested, see Figure 3) under each bolt. Tighten the bolts in an
alternating star pattern in several increments until the minimum torque value shown in Table 2
is achieved.
Figure 3 – Bonnet Bolting
NOTE: For best long term bonnet sealing, the bolting should be re-tightened after system pressure is
applied to the body.
7.17 Place the actuator on the body and bolt it to the body tightly. Using air, stroke the actuator to
the bottom of its stroke and hold it there.
7.18 Install the split stem clamp and bolting. Stroke the plug open. Turn the plug stem out of the
actuator stem threads an additional amount according to Table 3. This will ensure that the
piston in the actuator does not hit the yoke before the pilot plug makes contact with its seat.
CAUTION: If binding or sticking is observed, discontinue stroking the valve and reassemble using
the above steps. Failure to do so could cause serious valve damage.
Table 3 – Plug Adjustment
Valve Stroke Turn the plug out an additional:
in. mm in. mm
3 or less 76 or less 0.19 5
4 102 0.25 6
6 152 0.38 10
8 203 0.50 13
a
Figure 6, Bonnet Bolting
Bonnet Flange Bolting
Disc Springs
Bonnet Flange
Body
Bonnet
Segmented Retaining Ring
Pressure Seal Retainer
Pressure Seal
Figure 6, Bonnet Bolting
Bonnet Flange Bolting
Disc Springs
Bonnet Flange
Body
Bonnet
Segmented Retaining Ring
Pressure Seal Retainer
Pressure Seal