
10
6.2 Inspection
■
Ball valve
・
Ball [Fig.6-5]
Measure the outside diameter, and if it is out of the
allowable range, replace the ball with a new one.
Allowable range of the ball
DP
-
10Fi S
φ
14.3
~
S
φ
16.3 mm
DP
-
20Fi S
φ
24.3
~
S
φ
27.8 mm
・
Valve seat [Fig.6-6]
Measures the dimension shown on the left figure, and if
it is out of the allowable range, replace the valve seat
with a new one.
Allowable range of the valve seat
DP
-
10Fi
2.4
~
5.9 mm
DP
-
20Fi
2.8
~
7.0 mm
6.3 Installation
For installation, see [Exploded View] on the separate sheet and install in the reverse order of
disassembly.
Tightening torque for the valve stopper and valve cap
DP
-
10Fi, DP
-
20Fi
20 N
・
m
<
NOTE
>
Make sure there is no dust on the seal surface and
the seal is not damaged.
Be sure to replace the PTFE O ring with a new one.