24
EB 8091-1 EN
Mounting and start-up
Mounting position
Generally, we recommend installing the
valve with the actuator upright and on top of
the valve.
Vent plug
Vent plugs are screwed into the exhaust air
ports of pneumatic and electropneumatic de-
vices. They ensure that any exhaust air that
forms can be vented to the atmosphere (to
avoid excess pressure in the device). Further-
more, the vent plugs allow air intake to pre-
vent a vacuum from forming in the device.
Î
Locate the vent plug on the opposite side
to the workplace of operating personnel.
Î
On mounting valve accessories, make
sure that they can be operated from the
workplace of the operating personnel.
Table 3:
Inlet and outlet lengths
Q
a x DN
b x DN
State of process
medium
Valve conditions
Inlet
length a
Outlet
length b
Gas
Ma ≤ 0.3
2
4
0.3 ≤ Ma ≤ 0.7
2
10
Vapor
Ma ≤ 0.3
1)
2
4
0.3 ≤ Ma ≤ 0.7
1)
2
10
Saturated steam (percentage of condensate > 5 %)
2
20
Liquid
Free of cavitation/w < 10 m/s
2
4
Cavitation producing noise/w ≤ 3 m/s
2
4
Cavitation producing noise/3 < w < 5 m/s
2
10
Critical cavitation/w ≤ 3 m/s
2
10
Critical cavitation/3 < w < 5 m/s
2
20
Flashing
–
2
20
Multi-phase
–
10
20
1)
No saturated steam
Q
Flow rate
a
Inlet length
b
Outlet length
Содержание 3510
Страница 29: ...EB 8091 1 EN 29...
