A valve for life
September 2014
Valves, Actuators & Pump Control
The standard type triple eccentric valve has very limited maintenance options which render it unserviceable should there be any wear to the valve seat or it gets damaged as the seat is machined into the body with a weld-overlay.
Since its launch at Valve World 2000, Orton gained an edge in this highly competitive technology by introducing its second generation triple eccentric valve – a valve where not only the seal on the disc can be changed, but the seat in the body as well.
Triple eccentric valves are metal seated with resilient seat capabilities – there is zero leakage through the seat and because of the triple offset design there is no rubbing between seat and seal ring on the disc, thus sealing integrity is maintained. That is the theory, however, in practice the body seat does sometimes wear and the valve could eventually start to leak. The cost of re-machining the body seat of a standard type valve is unviable, which then means the valve must be replaced.
Another motivating factor for Orton to develop its bolted seat design was to extend the range of applications for the valve. Being able to service a valve is an important feature for applications where abrasive fluids, corrosive media, high cycles or thermal stresses may cause damage to the sealing components (body seat and seal ring). With the introduction of this feature, the choice of suitable seat materials has increased over the limited traditional ones that may only be welded to the base body material.
For more information contact Keith Mitchell, Heaton Valves Africa, +27 (0)31 902 8241, [email protected], www.heatonvalves.co.za
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