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Table 11: Inlet and outlet lengths
State of process
medium
Gas
NOTICE
!
Premature wear and leakage due to insuffi‑
cient support or suspension.
In the following versions, the control valve
must be supported or suspended:
− Valves that are not installed with the actua‑
tor in the upright position on top of the
valve.
Attach a suitable support or suspension to
the valve.
Vent plug
Vent plugs are screwed into the exhaust air
ports of pneumatic devices. They ensure that
any exhaust air that forms can be vented to
the atmosphere (to avoid excess pressure in
the device). Furthermore, the vent plugs al‑
low air intake to prevent a vacuum from
forming in the device.
Î Locate the vent plug on the opposite side
to the workplace of operating personnel.
EB 8020-1 EN
Q
a x DN
Valve conditions
Ma ≤ 0.3
0.3 ≤ Ma ≤ 0.7
b x DN
Inlet length a
Î On mounting valve accessories, make
sure that they can be operated from the
workplace of the operating personnel.
Note
The workplace of operating personnel is the
location from which the valve, actuator and
any mounted valve accessories can be ac‑
cessed to operate them.
5.2.2
Additional fittings
Insulation
Only insulate control valves with bellows seal
up to the bonnet flange of the valve body for
medium temperatures below 0 °C and above
220 °C.
Test connection
Versions with bellows seal fitted with a test
connection (G
1
Mounting and start-up
Q
Flow rate
a
Inlet length
b
Outlet length
Outlet length b
2
2
) on the top bonnet allow
/
8
4
10
33
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