Technical Data; Gland Nut Torque; Stem Assembly Torque; Insert Torque - Flowserve Worcester V-Flow 53 Series User Instructions

10 Technical Data

10.1 Gland nut torque

The torque to be applied to the gland nut to ensure the correct amount of stem
sealing.

10.2 Stem assembly torque

The torque required to operate the assembled stem before the ball and seats are
fitted to the valve.

10.3 Insert torque

The torque required to fully tighten the insert of one piece valves to achieve metal to
metal contact.

10.4 Interface torque

The torque required to fully tighten the bolts that retain both parts of the body to
achieve metal to metal contact.

10.5 Torque data

Gland nut –
Size
build (Nm)
DN 15
DN 20
DN 25
DN 32
DN 40
DN 50
DN 65
DN 80
DN 100
DN 150
DN 200
Worcester V-Flow 53 / 54 Series User Instruction – WCENIM0027-01
Gland nut –
graphite PTFE build
(Nm)
5 – 7 6 – 9
5 – 7 6 – 9
6 – 10 8 – 12
6 – 10 8 – 12
8 – 12 13 – 18
8 – 12 13 – 18
21 – 26 19 – 24
30 – 37 80 – 90
30 – 37 80 – 90
50 – 55 90 – 110
50 – 55 90 – 110
Table 2 Torque Data
Stem
assembly
(Nm)
3 – 5
3 – 5
4 – 6
4 – 6
6 – 8
6 – 8
8 – 11
18 – 22
18 – 22
23 – 28
23 – 28
Page 12 of 15
Interface
Insert (Nm)
(Nm)
65 – 75
65 – 75
70 – 80
70 – 80
80 – 90
90 – 100
85 – 95
55 – 65
55 – 65
85 – 95
210 – 220