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Installation
(to avoid excess pressure in the device).
Furthermore, the vent plugs allow air intake
to prevent a vacuum from forming in the
device.
Î Locate the vent plug on the opposite side
to the work position of operating person-
nel.
Valve accessories
Î During connection of valve accessories,
make sure that they are easily accessible
Table 5-1: Inlet and outlet lengths
State of process
medium
Gas
Vapor
Liquid
Flashing
Multi-phase
No saturated steam
1)
5-2
Q
a x NPS
a x DN
Valve conditions
Ma ≤ 0.3
0.3 ≤ Ma ≤ 0.7
Ma ≤ 0.3
1)
0.3 ≤ Ma ≤ 0.7
1)
Saturated steam (percentage of condensate > 5 %)
Free of cavitation/w < 10 m/s
Cavitation producing noise/w ≤ 3 m/s
Cavitation producing noise/3 < w < 5 m/s
Critical cavitation/w ≤ 3 m/s
Critical cavitation/3 < w < 5 m/s
–
–
and can be operated safely from the
work position.
5.2 Preparation for installation
Before installation, make sure the following
conditions are met:
− The valve is clean.
− The valve and all valve accessories (in-
cluding piping) are not damaged.
− The valve data on the nameplate (type
designation, valve size, material, pres-
Q
a
b
b x NPS
b x DN
Flow rate
Inlet length
Outlet length
Inlet length
Outlet length
a
2
2
10
2
2
10
2
20
2
2
2
10
2
10
2
20
2
20
10
20
EB 8012 EN
b
4
4
4
4
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