4
4.2 Inspection
■
Ball valve type
▪
Ball [Fig.4.9]
Measure the outside diameter, and if it is outside the usable
range, replace the ball.
Usable range of Ball
NDP-15 S
Ø
20.0 ~ S
Ø
22.8 mm
▪
Valve seat [Fig.4.10]
Measure the dimension shown at left, and if it is outside the
usable range, replace the seat.
Usable range of Valve seat
NDP-15
2.6 ~ 5.7 mm
■
Flat valve type
▪
Flat valve [Fig.4.11]
Measure the dimension shown at left, and if it is outside the
usable range, replace the seat. If the seal ring is worn out or
cracked, replace it.
Usable range of Flat valve
NDP-5
2.5 ~ 3.1 mm
NDP-15
4.3 ~ 5.0 mm
▪
Valve seat [Fig.4.12]
Measure the dimension shown at left, and if it is outside the
usable range, replace the seat.
Usable range of Valve seat
NDP-5
5.8 ~ 7.1 mm
NDP-15
8.2 ~ 10.0 mm
▪
O ring (other than PTFE)
If O rings is worn out or cracked, replace it.
4.3 Installation
For installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly.
Tightening torque for manifold retainer bolts or nuts
NDP-5 7.5
N•m
NDP-15 12
N•m
< NOTE >
▪
Make sure there is no dust on the seal surface and the seal
is not damaged.
▪
Replace the PTFE O ring regardless of its condition.
