The benefits of system solutions for valve users
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Catalog excerpts

The benefits of system solutions for valve users - 1

The benefits of system solutions for valve users Pressure control Temperature control Technical process design 3.1. Checking of operating data Selection of system type Description and dimensioning using a pressure reducing station as an example 3.3.1. 3.3.2. 3.3.3. 3.3.4. 3.3.5. 3.3.6. Pressure reducer PREDU® Globe valves FABA® / orifice plate Safety valve SAFE Strainer / seperator Steam trap CONA® Other components Dipl.-Ing. Erhard Stork, ARI-Armaturen Albert Richter GmbH & Co. KG, D-33756 Schloß Holte-Stukenbrock Tel.: +49 5207/994-0, Fax: +49 5207/994-297, E-Mail: info.vertrieb@ari-armaturen.com, Internet:: http://www.ari-armaturen.com t000014343-2.doc

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The benefits of system solutions for valve users - 2

2/16 1. Introduction The correct functioning and right interplay of widely varying components e.g. valves in general installations, power plant stations, chemicals and petrochemicals and the processing industry, are essential for economical and smooth operation. The number of valves introduced runs from a few in small systems to several thousand in large and complex ones. These large systems must nevertheless be seen in respect of every detail not as a whole, but are able to be divided into individual subsystems. Since the functioning of these subsystems must also be able to be accurately...

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The benefits of system solutions for valve users - 3

Fig. 1: Steam pressure reducing station without auxiliary energy The exact dimensioning is described under point 3. “Technical process design". On the admission of steam, the control pipe and the water seal pot (Pos. 7) must be filled with water. The diaphragm of the pressure reducer hanging downwards together with the actuator is thus protected from the high steam temperatures. The bypass pipe is required for the manual operation of the downstream system in the case of maintenance of the strainer and the pressure reducer. For this purpose, globe valves in front and behind the pressure...

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The benefits of system solutions for valve users - 4

4/16 For controlling the reducing station, gauges in front and behind the pressure reducer are useful and the inlet pressure between the strainer and the pressure reducer should be measured, since a blockage of a strainer can be recognised by a pressure drop. For simplifying the setting and an easier recognition of any disruption, it is useful to arrange the measurement of the minimum pressure in the proximity of the pressure outlet point of the control pipe. Fig 2 shows a pressure reducing station with auxiliary energy, where instead of a pressure reducer, a pneumatic control valve (Pos.1)...

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The benefits of system solutions for valve users - 5

5/16 2.2. Temperature control Fig. 3 shows a temperature regulating station without auxiliary energy, with steam as heat transfer medium and a tube bank heat exchanger as the heat transfer device (Pos. 21). The temperature regulating valve TEMPTROL® (Pos. 1) functioning as the central component of the installation is shown in Fig 4. It functions without auxiliary energy on the principle of liquid expansion. Temperatures on the sensor bring about a change in volume in the capillary tube system, which are converted into a lift change in the actuator. The set value can be accurately set on the...

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The benefits of system solutions for valve users - 6

Adjusting knob Indicator unit Set point indicator Valve Fig. 4: Temperature regulator TEMPTROL® Capillary tube condensate collection system via the steam trap CONA-S® (Pos.17). By reason of its construction, this trap adapts itself immediately to the quantities of condensate formed according to the opening of the temperature regulating valve. The drained condensate from the seperator is collected as in the case of the pressure reduction station, but due to its higher temperature, it is taken via a nozzle tube (Pos. 22) to the condensate collection system. For starting the installation, a...

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The benefits of system solutions for valve users - 7

Fig. 5: Temperature regulating station with auxiliary energy 3. Technical process design 3.1. Checking of operating data An accurate design of a system is not possible without knowledge of exact and complete operating data. To ensure a rapid and correct design, the use of a checklist such as that shown in Fig 6 is useful. Mistakes can be avoided and the time needed for delivery shortened. 3.2. Selection of the system type The selection of the system type is determined in the first place by the principal requirements placed on the subsystem of the complete plant e.g. pressure control,...

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The benefits of system solutions for valve users - 8

altered according to the regulators employed. Systems without auxiliary energy work with proportional regulators, where options of varying accuracy are limited. Behaviour, which may be required in the case of a failure of auxiliary energy is also a co- determinant of selection of installation type; for example, control valves with a safety function in the event of energy failure may be required. Please indicate when ordering: e.g. Type 22.PRS-S with Code B, C, J, M (pressure reducing slalion at ascending pipe, PN16, valves made of EN-JS1049, pipe made ol P235GH, bypass pipe, sleam traps...

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The benefits of system solutions for valve users - 9

9/16 3.3. Description and dimensioning, using the example of a pressure reducing station The basic procedure for the design of installation systems is described in detail below, using the example of a steam pressure reducing station (Fig 1) for individual valves/components. The dimensioning of the valves is given on the basis of the following installation data Medium : Saturated steam p1 : 12 bar(g) p2 : 8 bar (g) PS1 : 14 bar(g) PS2 : 10 bar(g) Capacity : 3000 kg/h It should be noted that the pressures p1 and p2 reproduce the normal operating conditions, whereas PS1 is the protecting...

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The benefits of system solutions for valve users - 10

10/16 force, which is directed against the force of the spring. By means of setting it, it is possible to alter the pre-tension of the spring in such a way that at the desired minimum pressure the two forces are in balance. If the quantity of steam being extracted is then changed, the plug is moved until balance is again reached. To protect the diaphragm from excessive steam temperatures, the control pipe and the water seal pot are filled with water. The quick and accurate calculation of the pressure reducer PREDU® is made possible through the computer programme ARI-VASI® [3]. After the...

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