Seats, closures, gates and body linings cast in silicon carbide, zirconia and other technical ceramics.
Ceramic where the flow is fastest: seat, closure and throat.
Cast close to final shape, ready to fit the valve.
In slurry and ash service, the valve parts worth making in ceramic are the ones in the flow path: seats, balls and discs, gates, nozzles and the lining of the body where the stream speeds up. Blasch casts these in silicon carbide grades, zirconia, silicon nitride or alumina, near net shape and with tight, repeatable tolerances, so seats and closures fit without heavy machining. They run in ash and mill discharge valves in power plants, in slurry valves for mining, and in chemical and titanium dioxide plants.
A valve that throttles or closes squeezes the flow through a small opening. Velocity peaks between seat and closure, and the solids in the stream cut into exactly the surfaces that have to seal tight.
Hardened steel and overlays slow that down, but the seat still loses its shape, the valve starts to pass, and the next step is a rebuild or a new valve.
Ceramic parts keep their sealing faces longer under the same particles. Because they are cast close to final dimensions, a replacement seat or disc fits the way the first one did.
A valve in abrasive service wears where the flow is fastest, so the ceramic has to sit where the velocity is, not where it is easiest to fit.
Parts for butterfly, ball and slide gate valves, as single components or as ceramic and metal assemblies.
Seats, balls and discs with closely toleranced sealing faces, for valves that have to shut off against solids.
Slide gates, ash control valve parts, multiport outlets and mill discharge valve components.
Small ancillary parts in the flow path that wear out the valve or the line if they are made of metal.
The grades include alumina bonded, reaction bonded, nitride bonded, oxide bonded and sintered silicon carbide, zirconia and silicon nitride. Zirconia and silicon nitride suit parts that need toughness, silicon carbide parts that see the hardest particles. Zirconia ceramics
The Blasch forming process holds a linear tolerance of about plus or minus 0.5% straight from the mold, which keeps sealing faces and mounting dimensions repeatable from one batch to the next. How the parts are cast
Valves are used in mining and mineral processing, power generation, chemical processing and cement production. Ceramics for mining and mineral processing
The fittings before and after a valve wear for the same reason, see in-line chokes and reducers and ceramic pump components. The full range is on wear products.
Yes. Send the valve type, size and the dimensions of the worn part. A Blasch engineer designs the ceramic part to fit the existing body.
It depends on the load. Where a closure takes impact, the engineer chooses a tougher grade or a ceramic and metal assembly, and keeps the ceramic in compression.
Butterfly, ball and slide gate valves, and the ash and mill discharge valves found in coal and biomass plants.
Tell us the valve type, the size and what flows through it. A Blasch engineer proposes the ceramic parts for that valve.
