Page 2 of catalogue Butterfly valves of Erhard GmbH & Co. KG

Butterfly valves today for the requirements of tomorrow
The purpose of butterfly Valves is to reliably start and stop the flow of media safely and at any time. They have numerous advantages compared to other types of valves, such as Gate valves: A Less space required within Pipe systems A Minimised stress in the elastomers in the seal area due to eccentric valve bearing A More favourable valve disc flow over the whole working range compared to obturators positioned perpendicular to the pipe A Lower operating torques, especially for larger nominal sizes New challenges ... Today's production and operation of butterfly valves requires sophisticated, perfected know-how, to satisfy the differentiated requirements: A Increased use of Stainless steel pipes increases the requirements for comprehensive protection against corrosion. A International standards, approvals and test regulations set maximum quality requirements (e.g. the requirements according to KTW, DVGW standards W270 or G260) A Rising energy costs require optimum flow performance with minimum pressure losses to ensure economic operation. A And last but not least, only long life valves and low maintenance costs ensure that the personnel costs necessary for operation are minimised. After all, nowadays, all the costs incurred over the whole life of the valve (life cycle costs) play a decisive role in the choice of product. ... and the solutions from ERHARD The wide range of ERHARD butterfly valves fills these requirements in a particular way. Innovative and customer-focused product development, state of the art engineering, production and assembly technology and continuous quality assurance throughout take place at ERHARD, concentrated in one location – for top quality “Made in Germany” before, during and after installation. This not only applies to the innovative ERHARD ROCO Premium butterfly valves, developed still further and available in nominal sizes DN 150 to DN 600 but also to ERHARD's EAK butterfly valves, tried and tested for many years. Well over 70 years of experience in the development and manufacture of butterfly valves is available for practically proven, robust and cost-effective designs. All types are of course based on current standards. Wide range of uses ERHARD butterfly valves are suitable, among other things, for drinking water, non-drinking water, gas and air as well as for wastewater and suspensions. This results in fields of application in drinking water extraction, production and distribution, in water transport, wastewater engineering and gas supply as well as in industry. The large range of nominal sizes and pressure ratings as well as the flexible installation and drive options are the perfect solution for many and diverse problems.

With its population of about 270,000, Arak is the capital of the Markazi province in the centre of Iran and the most important industrial town of the region. To ensure the energy supply of the city, the construction of a 4 x 325 MW power plant was started near the oil refinery in 1997. The valves for the cooling water units of all four blocks (which can can be operated using both crude oil and natural gas) were provided by ERHARD. The discharge side of the cooling water pump is fitted with a butterfly valve DN1400, complete with a Hydraulic drop-weight actuator. The four cooling towers, each 135 m high, are equipped with one additional butterfly valve DN900 each to serve as emergency opening valves. In case of large variations in temperature, these valves must fully open within a few seconds.

2