When it comes to the production and processing of metals having the right valve in the right place is essential if things are to run smoothly. The requirements may vary depending on where a valve is used, but they are always high: process-stability, long-lasting life time, easy maintenance and precise control are just a few examples.
Schubert & Salzer valves very precisely controls gases in burner installations in primary and secondary metallurgy or in alloying and galvanising processes as well as cooling water in continuous casting plants.
Further applications can be found in gas cleaning for denitrification with ammonia or in quenching flue gases. Valves are used in steam applications for vacuum systems and blast furnaces, for abrasive media such as coal powder or ore slag, in blowing systems as well as in mold cooling and in hot or cold rolling systems.
Types of valves used in Metallurgy sector
Sliding Gate Control Valves
When it comes to precise control of liquid and gaseous media, sliding gate valves are particularly suitable. Users appreciate the significantly lower consumption of energy due to the smaller actuator and extremely short valve stroke of 6-9 mm. Typical applications are control of O2/natural gas in burner systems, cooling water control in continuous casting and rolling processes; the control of N2 for inerting, argon flushing in alloying, as well as air regulation for zinc thickness adjustment on strip galvanizing plants or ammonia control for denoxification. The extremely rapid opening times of sliding gate valves enabling very high switching frequencies are ideal for the pulsed injection of oxygen in cupola and blast furnaces.
Angle seat valves in the form of on/off and control units offer a particularly compact construction and perform a very high number of switch cycles. In its many versions, the construction of the valve gives a highly efficient flow rate and can even be used in lightly contaminated media. They are available with a threaded connection as well as with welding ends or flanges. Actuation is either pneumatic or electric. The seat valves are ideal when liquid and gaseous media need to be shut off securely and without closing impact. Gases principally used in metallurgy include O2, H2, natural gas, argon and N2. Also water, oils, fuels, emulsions, chemicals or even steam are used. A special application in foundries is the shooting of cores or the compaction of the sand in molding plants using compressed air.
Ball sector valves
Schubert & Salzer’s ball sector valves have proved themselves particularly as control valves for abrasive, particle-loaded, dusty, viscous and crystallising media. Due to their especially designed ball sectors they are self-cleaning. They are precisely controlled by electric actuators and pneumatic actuators with top-mounted positioners. Typical applications include controlling the supply of coal powder to furnaces, of air in galvanizing plants and of contaminated water in mold cooling, as well as in the spray cooling in hot and cold rolling mills with high rangeability.