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Water Treatment: Prepared for all Applications

Drinking water is a precious and ever increasingly scarcer resource. The need by mankind for water increases continuously. Therefore the responsible handling of clean water and its supply increasingly becomes a priority for consumers, the economy and the authorities. To secure the supply of drinking water for the population and agriculture, as well as process water for energy production and industry, more and more water treatment plants are installed.

Buschjost offers a wide palette of products in water treatment for diverse demands:

  • Diaphragm valves of brass, stainless steel and plastic are developed especially for the medium of water and are best suited for the control of inlet water and for flow control in processing procedures.
  • Solenoid valves without differential pressure, which are increasingly being used for customized solutions, are proven products, for example, for ozone or control or air control.
  • Our valves, as well as the customized solutions, are found in applications from seawater desalination up to water sample analysis.

The applications reach from the control and regulation of polluted sea-, river- and brackish water to ultra-pure water production for the semi-conductor and pharmaceutical industries. Our valves are as used in small mobile water purification plants just as in large stationary sea water desalination plants.

Reverse osmosis is, for instance, one application area for Buschjost valves. This is a physical method for the concentration of materials dissolved in liquids in which the natural osmotic process is turned around by pressure. Reverse osmosis is used in the water treatment of drinking water and process water and for waste water treatment.

Thereby, the active principle is as follows: If, in a system of  solutions of different concentration e.g. water with different salt content, become separated by a semi-permeable membrane, the more highly concentrated one therefore attempts to dilute itself. Water molecules enter into the concentrated solution through the membrane. One only speaks of reverse osmosis when water molecules from the space with the more highly concentrated solution penetrate the half-permeable membrane in the direction of the lower concentrated solution. The pressure exerted on the concentration (e.g. with a pump) must thus exceed the osmotic pressure.

By the fact that the membrane is so fine-pored that the molecules of salts and mineral substances do not pass through, a high-quality filtration effect is achieved. With reverse osmosis, the water, now a constant 90 °, is rinsed past to the membrane surface. A subset penetrates through and is filtered.

The rest goes into circulation once more as a concentrate  or is collected and disposed of. All particles and molecules which are smaller than 0,002 mm are filtered out, thus also germs and spores.

The Buschjost solenoid valves offer all the necessary conditions for the application area. They have, for example, a suitable pressure range of 5 to 6 bar, EPDM seal and the right material. In the feed-/supply, brass valves are frequently used, while for the rinse and drain pipelines valves of high-grade steel or plastic are used. Buschjost valves can also serve FDA or NSF approval.

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