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The TWA extreme duty rotary valve is used extensively in the power generation and minerals industries due to their exceptionally long wear life.
Low maintenance is designed into this valve from the start- it is not a modification of a standard valve but an out and out special designed to cope with the most abrasive products where normally a rotary valve could not be used.
The rotor is cast from a single piece of ni-hard 500 Brinell and ground to size. The liner is adjustable and made from the same exceptionally hard material.
Ni-hard, unlike a thin wear coating, is hard all the way through, will not flake or pit and is very strong. |
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However a rotary valve is only as strong as its weakest point- usually the shaft seals. The TWA pioneered the use of mechanical shaft seals and they last as long (if not longer) as the service life of the valve without adjustment, lubrication or maintenance.
When eventually the valve does wear, the rotor can be reground and a new, undersize liner fitted at the fraction of the cost of even a new "standard" rotary valve.
The TWA is the most economic long-term valve available and the payback on these valves is normally extremely quick.
For the ultimate in valve longevity, the TWA can also be fitted with an alumina ceramic tiled rotor and liner. |
