Valves in action -
Bleeding and venting valves EB 3.51 & EB 1.12
Bleeding and venting of ozone reactors
Drinking water treatment step 1: ozonisation
Ozone treatment for purification of raw and waste waters is done in three vessels connected in parallel. The water passing through them is enriched with ozone which reacts with the water substances to be oxidised. Remaining traces of residual ozone will later be discharged completely during the process. Basically, the requirements for valves vary substantially with regards to startup, draining or separate operational air release in these ozone reactors. The valves must be designed for large flow rates, whereas they should be able to respond reliably to relatively small pressures.
TASK // Efficient bleeding and venting during startup and operation
Whilst large air quantities are rapidly released or supplied during startup and draining, only small quantities of air and residual ozone accumulate when the ozone reactors are in operation. The valves installed there must be designed correspondingly for both dimensions. If an exhaust venting capacity of 800 Nm³/h is required for filling and 600 Nm³/h for draining, only a minimal counterpressureis sufficient to close the valves.
SOLUTION // Startup bleeding and venting valve EB 3.51 and bleeding and venting valve for continuous operation EB 1.12
When being combined, the two ozone-resistant Mankenberg bleeding and venting valves EB 3.51 and EB 1.12 fulfill any requirement for an efficient ozonisation process. The startup bleeding valve EB 3.51 reacts reliably at a system pressure starting from just 0.05 bar. It closes safely with ozone-resistant elastomers and its large seat diameter allows for evacuation of large air quantities at low pressures. As continuous bleeding valve for the operating range from 0 to 2 bar, the EB 1.12 is ideally suited to discharge the residual ozone arising in the exhaust air. It reacts reliably to the operating pressure of 0.16 bar that is usually available as counter-pressure for closing the valve.
