Technical Data; Gland Nut Torque; Stem Assembly Torque; Insert Torque - Flowserve Worcester V-Flow 51 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

Size
graphite build (Nm)
DN 15
DN 20
DN 25
DN 32
DN 40
DN 50
DN 80
DN 100
DN 150
DN 200
Worcester V-Flow 51 / 52 Series User Instruction – WCENIM0026-01
Table 2 Torque Data
Gland nut –
PTFE build (Nm)
5 – 7
5 – 7
6 – 10
6 – 10
8 – 12
8 – 12
30 – 37
30 – 37
50 – 55
50 – 55
Page 12 of 15
Gland nut – Stem assembly
6 – 9
6 – 9
8 – 12
8 – 12
13 – 18
13 – 18
80 – 90
80 – 90
90 – 110
90 – 110
Insert (Nm)
(Nm)
3 – 5 65 – 75
3 – 5 65 – 75
4 – 6 70 – 80
4 – 6 70 – 80
6 – 8 80 – 90
6 – 8 90 – 100
18 – 22 700 – 740
18 – 22 900 – 1065
23 – 28 1500 – 1700
23 – 28 1800 – 2000