4
- Remove the O ring, valve seat, ball and valve stopper.
[Fig.4.5]
4.2 Inspection
■
Ball Valves
- Ball [Fig.4.6]
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-10Fs S
φ
14.3 - S
φ
16.3 mm
DP-20Fs S
φ
24.3 - S
φ
27.8 mm
- Valve seat [Fig.4.7]
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-10Fs
4.6 - 7.8 mm
DP-20Fs
4.8 - 8.2 mm
4.3 Installation
For installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly.
Tightening torque for vertical tie rod
2 N
･
m
＜
NOTE
＞
- Make sure that there is not any dust on the seal surface and
that any sealed part cannot be damaged.
- Replace the locking nut with a new one regardless of its
condition. [Fig.4.8]
- Replace the PTEE or FFKM O ring with a new one
regardless of its condition.
- Retighten the tie rods immediately before starting the pump.
(See Section “8. Retightening the Tie Rods”)
Fig.4.5
Fig.4.8
Fig.4.6
Fig.4.7
