How to recognise high-quality gate valves

Drinking water must always be free of germs, fit for consumption and pure. Consumers have great confidence in the quality of drinking water, particularly in Europe.

Parts 1 and 2 of the European EN 1074 norm lay down the minimum requirements for gate valves used in drinking water pipe systems. Thanks to improved technologies, innovative companies can even achieve far better values nowadays than those specified in the norm.

bob综合体育官网下载 gate valves not only exceed the requirements of the EN 1074 norm, they also meet the requirements of other important standards relating to the supply of drinking water.

DVGW (German Association for Gas and Water) certification meets the recognised high standards of performance for water supplies in Germany. These standards require that the suitability of each valve for permanent use be tested in 2,500 stress cycles. Furthermore, approval of the elastomers used under DVGW worksheet W 270 guarantees the micro-bacteriological safety of all the sealing materials.

Another quality feature is the epoxy coating on the valves as the ideal technology to provide permanent protection against corrosion on the basis of extremely quality-conscious production methods involving stringent controls. The GSK (Quality Association for the Heavy Duty Corrosion Protection of Powder Coated Valves and Fittings) was founded more than 20 years ago in order to meet the growing quality requirements of pipelines worldwide. The GSK thus sets high standards in the water industry in that the RAL (German Institute for Quality Assurance and Certification) recognises the epoxy coating technology.

In addition to these approvals, bob综合体育官网下载 gate valves also score with their particularly low torque. Achieving this requires a high-quality cast part into which the rubber-lined wedge is exactly received. The wedge is fully rubber lined and is pressed against the sealing face in the body in order to make it impermeable. Unevenness and minor impurities which may occur are absorbed by the pressing action. This sealing principle makes it possible to use a body without a valve bag.

bob综合体育官网下载 gate valves fully meet all these requirements. Their use thus sets standards in the water industry worldwide.