Building materials & glass

The manufacture of building materials is a broad field and offers innumerable opportunities to employ different valves from Schubert & Salzer Control Systems. Typical control valve applications can be found in preparation and processing of base materials for the production of roof tiles or isloation material (e.g. glass or rock wool) or styrofoam, also for the production of cement, lime stone and aerated concrete. For the latter segmented disc valves type 5020 or 5030 but also sliding gate control valves type 8021 are used at autoclaves to precisely control steam and condensate. Precise control at good life time and tight closure are key aspects here where conventional valves face severe problems through heavy contamination of the steam and condensate.

For the production of glass and stone wool, sliding gate valves type 8021 and 8024 control phenolic resins. The extrem compactness of these valves in combination with their top mounted position make the suitable for the most restricted installation environments.

Roof tile production angle seat valves are needed to supply dye stuff, water and chemicals, where these robust valves offer a very long service life. Another application here is the supply of dye pigments and processing of waste waters through Schubert & Salzer pinch valves, where a pneumatically compressed tube stops or releases those visous, slurry or powderish products.   Also the robust ball sector valves have proven themselves in the rough environment of roof tile production, e.g. on mixers for minerals and quartz sands.                

In cement and lime production angle seat valves dose grinding agents or act as quick acting backpulse filter cleaning valves. Sliding gate control valves are used at ovens and furnaces to control natural gas, furnace oil, O2 or air.

Since 3500 a. D. glass is produced by melting quartz sand (SiO2), soda (Na2CO3) and lime (CaCO3), whilst further ingredients may be added to facilitate certain properties or colours in the glass. The glass quality is determined by a very high control precision during the supply of O2, Oxyfuel and natural gas into the melting furnace. Depending on its composition the melting temperatur can vary between 1000 and 1600 °C. This optimised mixture of O2 and fuel at each individual burner depends on a high control precision delivery by the control valve. the Schubert & Salzer sliding gate control valves providing very fast reaction times due to their short strokes and small actuators have shown to be an ideal solution here. Stroke lengths between 6 and 9 mm and very low driving froces allow a very fast prices control, enabling very dynamic changes of flow rates necessary during the smelting process. Even after the smelting process sliding gate valves are used to control urea or ammonia for  desulfurisation of the exhaust gases. Sliding gate valves can be supplied also for hazardous (Ex) areas and with DVGW approvals.