• main graphic - pressure reducing valve DM 555 - control curve

The Mankenberg pressure reducing valve DM 555 provides the usual reliability of a self-acting industrial valve whilst it features the regulating curves of a control valve. We would like to show you what makes the control characteristics of Mankenberg’s DM 555 so unique. Let us have a look on how such control curves are structured.

graphic - normal control curve

First of all, we take a glance on a typical self-acting control valve curve:

It is normal for a self-acting industrial valve to have a certain control deviation and this is considered during selecting the suitable valve. A control deviation of ±10 % from the pre-set downstream pressure (dotted lines) in the range from 10 % to 75 % of the max. Kv value is common. Anyhow, the control deviation occurs only if one or more operating parameters change. These may be either the upstream pressure or the Kv value. In general, the typical control curves of self-acting industrial valves rather tend to be falling. In return, such valves do not require any external energy, which would have, for example, significant safety advantages in the event of a power failure.

General information on the valve control curve

The control curve of a pressure control valve features the control characteristics and/or the control deviation of a valve. In addition, the maximum Kv value can also be read off. The Kv value is a flow coefficient determined with water at 1 bar ΔP and a water temperature of 20 °C.

In a nut shell: The Kv value describes the flow rates in m3/h. A high Kv value simply states that much fluid can flow through the industrial valve. The Y-axis of a control curve indicates the adjustable downstream pressure [bar]. The X-axis indicates the Kv value. So the diagram provides information on how much fluid may flow through the valve at a determined pressure which must be regulated.

pressure reducing valve DM 555 - control curve

The DM 555 makes a control valve USP obsolete

Normally, control valves have a very linear control curve. By means of auxiliary energy they are capable of counteracting the control deviation. Our engineers prove with the DM 555 that this is no USP of control valves. The new Mankenberg pressure reducing valve DM 555 features a linear control curve that usually only control valves achieve. Thanks to the perfect balance of forces within the DM 555, the valve has nearly no pressure losses and has almost no control deviation. Just mechanical art!

Other advantages of the DM 555

We must admit that the following advantages are no USP of the DM 555 but rather the advantages of all self-acting industrial valves that also the DM 555 can pride boast of.

You have already read about the significant safety advantages in the event of a power failure. Additionally, self-acting control valves help to reduce the complexity of bulky processes. Particularly because Mankenberg works in an agile and digital manner, we are aware of the advantages of self-acting valves. It is clear that process analyses of your plants are absolutely necessary! However, in times of Big Data only the relevant pieces of information should be passed along and data bases should be kept lean. Self-acting control valves manage this issue because they are installed, adjusted and then operate self-actingly. Mankenberg call this „set & forget“.

Did you know that our valves are successfully installed also in the mining sector or in oil and gas pipelines? The reason is that no electricity network must be laid in a pit or in the desert for controlling the pressure.

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