High functional rellability under difficult operating conditions is one of the most important requirement for nearly all of our customers. As operating conditions can be highly individual. The majority valves are tailor-made to ensure they ideally meet customers needs.
We offer a comprehensive range of tight shut-off, throttle and valves as well as check valves and combinations of both Systems. The constructing of tailor-made solutions to fulfil special customer wishes is part ot our daily business. We often develop valves together with our customers completely in line with their specific requirements and wishes.
The type of medium
The foremost selection criterion is the question of the type of medium. Is it liquid, gas or steam? The inertia and viscosity of the medium are the main factors determining the characteristics of the valve. Equally important is the time the flow of the medium can take to reverse behind a turbine or pump. In certain applications, e.g. in the case of gas, this can happen within 0.2 seconds, in which time the valve must react as a protective feature.
In the case of liquid media the closure characteristics are then considered, as the valve must be dampened and close in a controlled way in order to avoid the danger of water hammer. Water hammer occurs when a valve that closes without being dampened is quickly pressed into its seat by the reverse flow of the medium when the pump is switched off. This causes a shock wave that can cause damage to the entire system.
Free-swinging or controlled
In a great number of applications the check valve is set up to swing freely, i.e. it opens when the medium flows without outside control and closes in reverse flow situations, e.g. in order to protect pumps. The valve is balanced in such a way that it is forced open by the media flow as desired. It then closes again when the media flow decreases. However, the free-swinging valves can be blocked in determined positions in order to control the flow of media by means of an overrunning clutch. The overrunning clutch makes it possible to block in the flow direction, whereas the valve still closes when the pressure drops.
Gas and steam
In the case of gas and steam systems, the first selection criterion is initially the question of whether a counterweight is sufficient for the closure system or whether a closure drive needs to be used. Closure drives have the advantage of making it possible to close the valve extremely quickly. Furthermore, they can be connected to external control systems.
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