Information On Reach And Rohs; Declaration On The Reach Regulation 1907/2006; Declaration On The Rohs Directive 2011/65/Eu; Further Information - Mankenberg VV Serie Originalbetriebsanleitung

Original operating manual
Vacuum breaker VV

12 Information on REACH and RoHS

12.1 Declaration on the REACH Regulation 1907/2006

The Mankenberg product provided may contain candidate substances (SVHC) in a concentration of less than
0.1% (w/w) in accordance with the Candidate List (REACH Regulation, Article 33); as per January 2021.

12.2 Declaration on the RoHS Directive 2011/65/EU

Mankenberg products are not electrical or electronic equipment and therefore do not fall within the scope of
RoHS Directive 2011/65/EU (RoHS 2, Article 4, paragraph 1 or Annex I).

13 Further information

You can obtain these instructions, the MANKENBERG data sheets quoted as well as further information –
including English language versions – from the following addresses:
Mankenberg GmbH
Spenglerstrasse 99
D-23556 Lübeck

14 Know How Vacuum Valves

14.1 Function

Vacuum breakers protect vessels and pipelines against vacuum. A vacuum can build up when a system is being
drained, when it cools down or when a pump fails. Vacuum control valves are pressure reducing or overflow
valves which control pressures below 1 bara.

14.2 Vacuum control valves

See Kow How pressure reducing valves and overflow valves.

14.3 Vacuum breakers

14.4 Operation

Vacuum breakers protect installations, vessels etc. against vacuum. They are normally closed. If the pressure
inside a tank or vessel drops below atmospheric pressure by more than the set differential pressure, the valve
opens causing the system to be vented until the set pressure difference has been established again. Vacuum
breakers remain closed when the pressure rises above atmospheric; therefore they do not offer protection
against excessive pressure.

14.5 Selecting valve type and nominal diameter

Vacuum breakers should be selected according to the pressure difference between the atmospheric pressure
and the pressure inside the vessel or pipeline, not according to the vacuum or absolute pressure in the vessel or
pipeline. All specifications given in data sheets or tables or on the scales of valves etc., relate to this differential
pressure. Another factor which must be taken into account when selecting a vacuum valve is the suction
capacity. For very small differential pressures vacuum control valves can be used as vacuum breakers.

14.6 Vacuum breaker capacity table

Please use the capacity table to select your vacuum breaker. The table applies to valve types 34 and 36. On the
left side you will find the nominal diameter; at the top (horizontally) you find the differential pressure given in bar
at which the valve opens.
VV-4.X.22.3 Issue 01.09.2022
Phone +49-451 -8 79 75 0
Fax +49-451 -8 79 75 99
E-Mail info@mankenberg.de
www.mankenberg.de
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