In a recent renewal and rehabilitation project, AVK VOD-KA in the Czech Republic has supplied numerous products for both old and new installations.
The water company Jihocesky Vodarensky Svaz (JVS) supplies water to about 380,000 inhabitants in 173 towns and villages. The volume of water supplied is around 16 million m3. The water supply system is 556 km long and supplies an area of 6300 km2.
In 2023, company JVS renewed four valve shafts that were regularly flooded. The existing - and often non-functional - gate valves were replaced with AVK PREMIUM100 gate valves in DN400 together with premium all-stainless-steel extension spindles. JVS chose the solution because of the requirement for maximum quality and control reliability even in the most difficult conditions.
Thanks to the additional 1.5 mm thick protective layer of PUR, which is applied on top of a superior epoxy layer, the valve no longer needs to be protected against corrosion and stray currents by banding (external added insulation). This premium protection also saves a lot of time for the contractor on site.
JVS also appreciates that the guaranteed service life of the product well exceeds the requirement of the EU standards (many times), and AVK guarantees an extended warranty of 20 years in addition to the premium materials used in the production of the PREMIUM100 valve.
Below is an example of an AVK PREMIUM100 gate valve from the construction site and the originally changed fittings.
Rehabilitating the raw water intake system – using AVK products
Also in 2023, JVS started the renewal of almost 7 km of raw water supply pipeline from the dam to the treatment plant. A new 1200 mm diameter steel pipe will run alongside the current DN1400 line which has been in operation for 42 years since the water treatment plant was commissioned.
The project also includes an 82 m long DN1000 line under the river, three reinforced concrete shafts, and other structures.
Several AVK butterfly valves DN1000 and DN800 in stainless steel seat design are installed on the line. These butterfly valves have the disc seated and fixed in the line so that there is no vibration of the disc during operation, eliminating the rapid wear of the seal which is essential to the functionality of the valve. This seal is uniquely shaped and is manufactured in AVK GUMMI’s own plant.
In addition to the shut-off valves, AVK supplies dismantling joints and control valves. The shafts are fitted with AVK air valves, which guarantee the necessary air supply capacity when filling or draining the line, as well as operational air supply and venting. AVK air valves has a feature of large opening for high-capacity airflow. This large opening also significantly reduces the possibility of dirt build-up. The air valves use a patented roll seal system that can be sensitive to even small pressure differences.
For us, the use of AVK products is proof that JVS relies on reliability, quality, technical support and service in their projects, which we really appreciate to be part of.
