[SM-206792-A/3]
―
15
―
INSTALLATION
４
4.3.6 Pipe connections
(1) Tubes to be used
For use with master valves with one-touch joints, select tubes of the type
specified by us: Soft nylon tubes (F-1500 Series)
Urethane tubes
(U-9500 Series)
(2) For installation at a site that has spatters in the air, select incombustible
tubes or metal pipes.
(3) For a piping used for both hydraulic and pneumatic controls, select a hydrau-
lic hose.
When combining a spiral tube with a standard one-touch joint, fix the tube
origin using a hose band. Otherwise the rotation of the tube will decrease the
efficiency of the clamping.
For use in a high-temperature atmosphere, select fastener joints instead of
one-touch joints.
(4) When selecting from tubes commercially available, carefully study the accu-
racy of the outside diameter as well as the wall thickness and the hardness.
The hardness of an urethane tube should be 93
°
C or more (as measured by
a rubber hardness meter).
With a tube that does not have a sufficient accuracy of the outside diameter
or the specified hardness, a decrease in the chucking force may cause dis-
connection or difficulty in inserting.
Tube dimensions
Outside diameter
mm
Inside diameter mm
Nylon
Urethane
φ
4
φ
2.5
φ
2
φ
6
φ
4
φ
4
φ
8
φ
5.7
φ
5
φ
10
φ
7.2
φ
6.5
(5) Minimum bending radius of tubes
Observe the minimum bending radius of tubes. Neglecting the minimum
bending radius may cause disconnection or leaks.
Tube bore
Minimum bending radius mm
Nylon
Urethane
φ
4
10
10
φ
6
20
20
φ
8
30
30
φ
10
40
40
Outside diameter allowance
Soft or hard nylon
±
0.1mm
Urethane
φ
4,
φ
6
+0.1mm
-0.15mm
Urethane
φ
8,
φ
10
+0.1mm
-0.2mm
