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Sometimes even the TWA ni-hard valve wears unacceptably fast when used with extremely abrasive materials such as mica, ceramic beads or silca.
The TWA can be supplied with 92% alumina ceramic tiled wear parts, supported on a carbon steel substrate held in place mechanically and bonded using a high performance epoxy resin developed especially for ceramic tiles.
We then diamond grind the rotor and liner using our own in-house facilities to make a perfect matched pair.
The rotor and liner are fitted to a standard TWA body and mechanical seals used on the shafts to ensure a maintenance free unit. |
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To give some idea of relative longevity, MID had one application where a customer was pneumatically conveying extremely fine powdered slate. A "normal" rotary valve with a cast iron body lasted a matter of days before being totally worn out. A ni-hard TWA lasted 6 weeks and came back to MID with holes the size of tennis balls worn into the ni-hard.
A ceramic lined TWA lasts 18 months in this application between retiles, and even then they are not worn to the point of failure. The mechanical sealing system, so effective on abrasive products, is often hardly worn at all and can be reused.
We believe we have the ultimate in rotary valve longevity with the TWA. |
