Gas terugslagkleppen in thermische procesinstallaties | wittgas.com

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Gas terugslagkleppen in thermische procesinstallaties

W M U Vieting
WMU Design manager Gerhard Vieting

WMU, a company for heat treatment systems for industry and environmental technology in Bönen, Germany, has successfully used non-return valves from WITT for years. Their design manager Gerhard Vieting is impressed by their quality.

„We use WITT non-return valves, because we are impressed by the many advantages of this product: The low opening pressures, the simple connections and lower pressure loss are major considerations."

WMU (www.wmu-gmbh.de) manufactures thermal process equipment. This includes continuous furnaces with integrated conveyer belts, roller hearth furnaces, vertical kilns and other thermal process equipment. For this equipment WMU has used non-return valves which can be installed independently of position for many years.

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As a rule, equipment for thermal processes is operated with a number of different gases simultaneously. These frequently include natural gas, hydrogen, nitrogen and various mixtures of these. Gas mixing and metering equipment is connected in series with the furnaces. WMU uses various non-return valves from WITT's wide range of products to prevent uncontrolled formation of explosive mixtures in the lines.

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Diverse toepassingen in de ovenbouw

The heat treatment process in the furnace begins as soon as the product to be treated enters the furnace on the conveyer belt. Usually the gas control devices are located in the rear section of the system near the gas feed.

The lower figure shows a non-return valve model NV 200 installed in a gas supply panel for continuous furnaces with nitrogen as purging gas and hydrogen as the process gas. Here it prevents formation of gas mixtures which could endanger the process, for example from the purging gas mixing with the hydrogen.

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Model NV 200 on gas feed panel for nitrogen purging line.

The great advantage of the NV 200 is its compact design and its capability for combining with all conventional threaded fitting systems.

Naturally the non-return valve is also available directly with WITT threaded fittings. The Wittfix pipe fittings are one example.

Moreover this demanding valve system ensures extremely high tightness for minimum leakage in all non-return valves systems.

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Here the Model NV 200 is shown on a gas feed panel for process and auxiliary gases (natural gas, ammonia).

The gas feed panel supplies a furnace used for carbonizing and carbonitrating, i.e. hardening steel. Model NV 200 prevents undesired gas mixtures, which could endanger the process.

W M U Vieting
Chef Constructie WMU
Gerhard Vieting

WMU Wärmebehandlungsanlagen GmbH für Industrie und Umwelttechnik Warmtebehandelingsinstallaties voor Industrie en Milieutechniek) in Bönen past sinds jaren met succes gas terugslagkleppen van WITT toe. Chef Constructie Gerhard Vieting is van voordelen van deze techniek overtuigd.

Wij passen WITT gas terugslagkleppen toe omdat we de vele voordelen van deze armaturen naar waarde weten te schatten: de lage ingangsdruk, de eenvoudige aansluiting en het geringe drukverlies hebben ons overtuigd.

WMU (www.wmu-gmbh.de) produceert thermische procesinstallaties. Daar horen o.a. doorloopovens met geïntegreerde transportbanden, rolovens, schachtovens en andere warmtebehandelingsinstallaties bij.

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Het type NV 200 wordt bij WMU ook bij gasmengers voor de toevoer van een waterstofschachtoven toegepast. Hij wordt tussen twee toevoerleidingen geschakeld om een betrouwbare vermenging mogelijk te maken.

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