Valves, Actuators & Pump Control


Heaton Valves Africa wins ESDV project

August 2014 Valves, Actuators & Pump Control

In recent years, triple eccentric valves have come into vogue for process design engineers when designing new or upgrading existing plants. Many data sheets nowadays specify triple eccentric valves as opposed to the traditional ball, plug or butterfly valve. However, it was the forward thinking of the project engineering team that helped Heaton Valves Africa score a contract win over its competitors.

The client saw the benefit of buying a valve for life, rather than opting for the less expensive standard type triple eccentric valve with its limited maintenance options.

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. Something nobody else was offering at the time of this particular project.

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 will sometimes wear and the valve could eventually start to leak. According to Heaton, the costs 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 their 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.

Actuation

Again, the client chose an option with a unique feature. The DVG actuator provides a compact design and has a patented mechanism to reduce the wear effect on all loaded and sliding components, thus extending the overall lifespan. All actuators were reliability tested under temperature and subjected to severe endurance in order to get:

* SIL 3 product certification.

* SNAM Rete Gas qualification.

* Shell Global Solutions international qualification.

For more information contact Keith Mitchell, Heaton Valves Africa, +27 (0)31 902 8241, keithmitchell@heatonvalves.co.za, www.heatonvalves.co.za





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