Einleitung; Intended Use - Mankenberg NV 93 Betriebsanleitung

0 Einleitung

This manual is intended to assist users of a MANKENBERG float valve NV during installation, operation
and maintenance. Read the manual thoroughly before installing or putting this valve into service.
Failure to follow the following instructions – particularly the cautionary and warning
notes – may lead to hazards and may invalidate the manufacturer's warranty.
MANKENBERG is at your servíce for any assistance and queries.
caution
See Section 11 <Further information> for the addresses.
Technical information is also available at www.mankenberg.de

1 Intended use

A MANKENBERG float valve NV for vessels and pipelines is intended for registering the liquid level by
a float and to adjust its flow rate for regulation. As standard, the float is designed for non-foaming liquids
of the density of water in pressureless vessels.
The use of the fitting with liquids of other density and the operation in a pressurized vessel need adjustment
of the float and therefore must be checked with MANKENBERG.
MANKENBERG float valves for installation in vessels NV 93, NV 94 or NV 98 are installed inside
the vessel.
MANKENBERG float valves for installation on vessels NV 67e are installed at the outside of the
vessel with inlet and/or outlet pipes.
MANKENBERG float valves for pipelines NV 16, NV 16e, NV 26 and NV 66e are installed in the
pipeline. The float is positioned inside the vessel and controls the valve by a lever system or a cable pull.
MANKENBERG planning documents are available to give users precise assistance in selecting and de-
signing the appropriate fitting, e.g.:
In the section <NV/NR: Level control valves>:
<Know-how on level controllers/float valves>
<Selection float valves>
<Data sheets NV.... > with technical data and tables of the setting ranges and the dimensions.
A float valve is not a safety valve for the protection against overpressure.
If an overpressure limitation is necessary, a suitable fitting must be present.
note
These valves are no shut-off elements ensuring a tight closing of the valve. In accordance
with DIN EN 60534-4 and/or ANSI FCI 70-2 they may feature a leakage rate in closed
position in compliance with the leakage classes II – V:
Leakage class II (metal sealing double seat cone) = 0.5% K
Leakage class III (metal sealing cone) = 0.1 % K
Leakage class IV (PTFE seal cone) = 0.01 % K
note
Leakage class V (soft seal cone) = 1.8 x 10
*D=seat diameter
MANKENBERG valves are supplied as standard for screw-mounted or flange-mounted pipeline/tank
connections – also for special connections if required.
The upper limit of the permitted operating data for pressure and temperature is permanently marked on
each fitting supplied.
In the following sections the different construction types are combined under the heading of "Float
valves" apart from a few sections that only apply to the construction types mentioned.
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x Δp x D* [l/h]
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