Valves Butterfly Valves That Can be Installed in Plastic Pipes

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Ebro Armaturen has introduced a butterfly valve that can be used in plastic pipes. Easy to remove, the valve can also be recycled as a single material and ensures easy, error-free assembly, maximum flow as well as optimal hygiene.

In redesigning its Series Z 400, Ebro Armaturen has emerged as the only company within the market to offer a butterfly valve that has been specially developed for use in plastic pipes, claims the company. Dimensions precisely adapted to the standardized PE/PP stub flange, and especially the adaptation of the inside diameter to that of PE/PP pipes, serve to ensure easy, error-free assembly, maximum flow and optimal hygiene, states the company.

PE/PP piping has many advantages over metal piping: it provides a high level of corrosion resistance, and hence offers a service life of up to 100 years. Not only that, it is much lighter and welding is performed without any naked flame. One of the resulting benefits is a much smaller carbon footprint than with metal pipes. The pipes meet high mechanical, physical and chemical standards. In addition, by using a very wide range of plastics it is possible to meet virtually all of the properties specified by customers. That is why plastics have become an integral part of nearly all industries and applications, e.g. the semiconductor industry, water management, the battery industry, the agricultural and food industry, and the drainage system sector.

To be able to exploit all the benefits of PE/PP piping to full advantage, it is necessary to accurately match all the components used to applications in plastic piping. One weak point to date has been the use of butterfly valves, as all the valves available on the market were, irrespective of their material (metal or plastic), actually designed for metal pipes.

If conventional butterfly valves made of metal or plastic are used, the different wall thicknesses of the plastic pipes can lead to a number of problems. To be able to use them in PE/PP pipes, the latter have to be adapted. The stub flange has to be machined, in many cases in the field, on the construction site or at the point of installation, which costs time and money. The consequences are a reduction in sealing surface area, larger dead spaces and greater susceptibility to corrosion. Furthermore, the additional effort required in planning and assembly is significant. These subsequent machining processes also create problems with regard to the manufacturers' warranty.

The Hagen-based valve manufacturer Ebro offers a cutting-edge solution to the problem, in the form of its new Series Z 400 butterfly valves. They are perfectly matched to the dimensions of plastic pipes. The inside diameter of the valve is the same as the diameter of standardized PE/PP stub flanges, which, as a result, no longer have to be machined. Consequently, it is no longer necessary to adapt two intrinsically incompatible systems by making subsequent corrections. There is no detrimental impact on safety during installation, operation or maintenance and warranty rights remain fully intact owing to the use of the new series of butterfly valves, mentions the firm.

In the case of the new solution, the sealing surfaces of stub flange and valve are precisely matched to one another so they provide an optimal flanged joint. As a result, it is also no longer necessary to bore or chamfer the stub flanges when installing the valve. This maximizes the stability of the flanged joint and fittings, which in turn provides the basis for a sturdy, gas-tight, pressure surge-resistant, vacuum-proof and flow-optimized design. At the same time, the valve is easy to remove and can be recycled as a single material, opines the company.

The collar can also be changed in the completely maintenance-free valve. Owing to the flow-optimized valve disc and virtually dead-space-free transitions, any pressure loss is minimized while the flow rates are maximized, explains the firm. Valve operation is highly energy-efficient and hygienic. The new series of butterfly valves is available in all sizes from OD 50 to OD 630 without any limitations and provides standardized interfaces for all types of actuators. According to the company, the new valves are ideal for general industrial applications and for sectors where German air pollution regulations ‘TA-Luft’, the German DVGW gas/water code of practice and Atex Directive 2014/34/EU (with type testing) are applied.

Seamless correlation of pipe dimension and valve in planning, assembly, service and maintenance is ensured by unambiguous data for all the relevant specifications. Whilst conventional rating plates only state the dimension of the loose flange (DN/PN), the rating plates in the entire series state all the relevant data such as SDR, OD, DN and PN.

The new butterfly valves include a wide range of special sealing materials, e.g. DVGW certifications are available for use in pipe networks for water or gas supply. It is available in all sizes from OD 50 to OD 630 without any limitations.

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