2/4
. 3) Finish the welding of both sides of the cap.
4) After cooling, clean body and caps
5) Rotate the valve to the original position, insert bolts and screw down nuts lightly. During
operation, it is very important to keep body and cap in a good parallel state to keep cap from
distortion.
6) Screw down all the bolts and make sure to follow the max. value of bolt screwing torque(refer
to attached list)
7) Do complete examination.
e. After installation, should make sure that pipes can bear the pressure.
4.
Operation and Use
a. Flush the ball valve and pipeline thoroughly again before operation.
b.
The operation of the valve consists of turning the stem(by manual or automated means)1/4
turn(900)clockwise to close, and 1/4 turn counter-clockwise to open.
c.
When the handle (if used) and/or stem flats or groove are in line with the pipe, the valve is
open.
d.
Operating torque requirements will vary depending on the length of time between cycles,
media in the system, line pressure and type of valve seat. The figures in the following table C
are based on PTFE seats with clean water as the media.
Table A: Torque of Stem Table B: Lock Torque of Stem Nut
5.
Maintenance
Long life and maintenance-free of valves can be maintained under normal working conditions and
in accordance with pressure/temperature and corrosion data chart.
Size
IN-LB N.M
DN6-DN10 40
4.5
DN15 44
5
DN20 53
6
DN25 89 10
DN32 115 13
DN40 168 19
DN50 221 25
DN65 354 40
DN80 575 65
DN100 885 100
Size IN-LB N.M
DN6-DN10
70
～
80 8.0
～
9.0
DN15 70
～
80 8.0
～
9.0
DN20 90
～
100 9.0
～
11.3
DN25 90
～
100 9.0
～
11.3
DN32 140
～
160 15.8
～
18.1
DN40 140
～
160 15.8
～
18.1
DN50 180
～
200 20.4
～
22.6
DN65 180
～
200 20.4
～
22.6
DN80 180
～
200 20.4
～
22.6
DN100 250
～
270 28.3
～
30.6