ERHARD Brochure
16Pages

Lasting protection with ERHARD Pro-Enamel

Enamel – a fascinating traditional material Around 3,500 years ago the first pieces of jewellery were enamelled on Cyprus as burial objects. The Romans and Celts also knew this fascinating material, whose resistance is demonstrated by the fact that many of these valuables have retained their original beauty even after thousands of years in the ground. For many centuries, enamel was used for producing jewellery, and in later times it was also used for household goods and road signs. Today, thanks to its special properties, enamel is also an indispensable engineering material in a large...

The enamel slurry is sprayed onto the metal, especially for large valves such as this butterfly valve. After it has been fired in the furnace at over 700 °C, the desired vitreous, high-strength enamelling is created in the required colour. There are several steps in the manufacture of high-quality enamelling. Firstly, all the raw materials are finely ground and melted; the molten material is then poured into water and quenched. The result is a granular, vitreous frit, which is now finely ground, during which water, clay and silica dust as well as turbidity materials and pigments are added....

ERHARD Pro-Enamel – optimum protection for valve and medium The basis for perfect enamelling to the DIN 51178 standard is the correct metallic substrate. ERHARD makes its valves from high-quality spheroidal graphite cast iron, which contains precisely defined fractions of carbon, silicon, manganese, phosphorus, sulphur, magnesium, aluminium and other trace elements. Perfect bonding during firing only occurs with this exact mixture. ERHARD Pro-Enamel – more than just a coating With enamelling, the vitreous enamel does not lie on the component as a sepa1 2 rate layer, as is the case with...

Thanks to these properties, the products can be used in a wide range of applications, from raw water to drinking water and seawater through to sewage, even if it is acidic or alkali. ERHARD Pro-Enamel not only protects the valve on the inside, but also securely and reliably protects fully enamelled valves from corrosion on the outside. Therefore, even in soil class III, no further protective measures are necessary before the valve is installed. Safety for drinking water and use The flow of the enamel material during the melting process produces an extremely smooth surface, far smoother than...

The enamel professionals for many decades ERHARD valves with vitreous enamel have been successful on the market for many decades; this means that we have extensive experience and comprehensive process know-how for this technology. A modern enamelling plant in our factory in Heidenheim enables us to achieve flexible and yet high-quality production, as we can seamlessly monitor all the steps of the enamelling with ERHARD Pro-Enamel. This begins with the degassing annealing in the first firing furnace, which is followed by the surface treatment of the workpiece. Before it can be enamelled, the...

Valves with ERHARD Pro-Enamel for every task Fully enamelled ERHARD maintains a wide range of fully enamelled valves in stock: ERHARD Underground ERHARD ROCO Premium ERHARD Premium hydrant & ERHARD butterfly valve* Multamed gate valve* saddle clamp* CITY hydrant Partly enamelled The product range is supplemented with numerous models, which not only have an EKB coating on the outside, but also have enamelling on the inside of the valve: ERHARD ROCO butterfly valve, ERHARD EAK butterfly valve ERHARD TWIN-AIR valve optionally dismantling type ERHARD non-slam nozzle check valve * ERHARD ROCO...

ERHARD underground hydrant with Pro-Enamel Hydrants have numerous areas of use in drinking water nets, for example: • drawing fire-fighting and emergency water, • providing temporary network connections during emergency deployments, • venting lengths of pipes and • temporary water supply for events or on construction sites. ERHARD offers its users the economic product variants of its hydrant family. For this reason, the ERHARD hydrant has proven its worth to utility companies, fire services and in other areas of use for many years. ERHARD underground hydrants represent the latest state of...

Properties and advantages at a glance Shut-off cone made from PUR Properties and advantages High tensile strength, low water absorption and therefore low wear Inner fittings made from tubular steel High stability with simultaneously low weight Connection flange with integrated seal and Easy assembly and installation recesses for positioning the ratchet 4 Complete draining of the hydrant for optimum hygiene Safety interlock Prevents the fittings from being ejected, if the working pressure is still applied during dismantling ERHARD Pro-Enamel

ERHARD ROCO Premium butterfly valve with Pro-Enamel The purpose of butterfly valves is to reliably start and stop the flow of media safely and at any time. The ERHARD ROCO Premium butterfly valve, with nominal sizes DN to DN 600, with its numerous innovative details represents consistent continued development of ERHARD butterfly valves, tried and tested for decades. Perfect force and form closure – the new polygonal shaft-hub connection The innovative polygonal shaft-hub connection has a fully closed valve eye, does not require any additional connection elements and, therefore, no...

Properties and advantages at a glance Soft-sealing, opening with double eccentricity Optimum sealing performance and easy to open and butterfly valve with securely fixed profile ring close, minimum mechanical stress Connection of drive shaft and valve disc by means of Reliable force transfer without play and with innovative polygonal shaft-hub connection high torque reserves for maximum safety Valve disc with optimised flow performance Low pressure loss and high cost-effectiveness High-quality enamelling and perfected design Long valve life due to corrosion protection with with ERHARD...