Flowserve Valtek Mark 14 - Manual (Page 11)

11
Valtek Mark 14 Control Valves FCD VLENIM0115-00 – 06/06
flowserve.com
Figure 2 – Pressure Seal Assembly
7.6 Refer to Figure 2 and assemble the pressure seal as follows:
7.6.1 Place the seat ring pressure seal retainer over the pressure seal with the axial leg
pointed down toward the pressure seal.
7.6.2 The disk spring is a Bellville washer style spring. Place the large disk spring in next
so that the OD makes contact with the pressure seal retainer.
7.6.3 Place the disk spring retainer in next so that its stepped surface is facing up.
7.7 Refer to Figure 1 and place the four segments of the seat retaining ring in the body groove.
Make sure that the side marked “TOP” is facing towards the top of the valve.
7.8 Apply thread locking compound (Locktite Blue or equivalent) to the thread of the socket head
bolts used to compress the seat ring pressure seal. Tighten the bolts down in an alternating
star pattern in several increments until the minimum torque value shown in Table 2 is
achieved.
Table 2 – Seat and Bonnet Torque Values
Bolt Size
Bolt Material
A193 B7/B16 A193 B8
inches ft-lb N m ft-lb N m
3 ⁄
8
18 24.4 13 17.6
7 ⁄
16
29 39.3 22 29.8
1 ⁄
2
44 59.7 33 44.7
9 ⁄
16
64 86.8 48 65.1
5 ⁄
8
88 119 66 89.5
3 ⁄
4
158 214 118 160
7 ⁄
8
257 348 192 260
All values are +/- 10%
7.9 Place the pilot operated plug assembly through the seat ring until in comes to rest on the seat.
For instructions on working with pilot operated plug assemblies please refer to Pilot Operated
Trim IOM; Document number VLENIM0064. To obtain a PDF of this IOM, visit
www.flowserve.com
NOTE: The plug should insert smoothly into the seat ring. If binding or sticking occurs, remove the
plug immediately and check for damage and misalignment.
Figure 2, Pressure Seal Assembly Cross Section
Centerline
Disc
Spring
Retainer
Disc
Spring
Pressure
Seal
Retainer
Pressure
Seal
Figure 2, Pressure Seal Assembly Cross Section
Centerline
Disc
Spring
Retainer
Disc
Spring
Pressure
Seal
Retainer
Pressure
Seal