Why the Need Variable Orifice Air Valve Technology? – A Brief Overview The need for a Variable Orifice Air Valve specifically in preventing damaging Surge and Waterhammer has been understood for more than 40 years. There have been several attempts to commercially produce a Variable Orifice Air Valve design. Most attempts required manual adjustment of […]
Points to Consider When Sizing and Positioning Air Valves – a 27 Year Review 27 years ago, the author wrote a booklet titled “Points to Consider When Sizing and Positioning Air Valves”, this was followed up with another book “Air Valve Technology Reviewed” in 1996 – both contained Air Valve Sizing and Positioning guides. These […]
4 Myths About Air Valve Design and Performance There are many myths regarding Air Valve design and performance. Four of the most popular ones are: Myth 1 – An Air Valve Is an Air Valve is an Air Valve…………. In a recent discussion on Air Valve performance with a senior design engineer from a prominent Consulting […]
Variable Orifice Air Valves vs Anti-Shock Air Valves Perhaps I should start off with a confession. The confession is this; I was part of the Anti-Shock development team in the 1990’s and for many years led this technology locally and globally in both a Technical and Marketing capacity and, through seminars and technical writings. These […]
Air Valve Technology a Critical Review The need for adequate, total and efficient pipeline performance has become more critical in recent times. This is due to the growing shortage of experienced maintenance teams, the increased focus on sustainable infrastructure development and the focus on Life Cycle Costing and pipeline efficiencies. Air valves are amongst […]
Sizing and Positioning Air Valves is a tedious but very critical process in pipeline design. REXUS introduces an easy to use Sizing and Positioning app that allows for the accurate sizing and positioning of air valves. Data can be imported from an Excel spreadsheet and computed results can easily be printed or exported to Excel […]
Do You Know Everything There Is To Know About Air Valves? Air valves generally constitute a small cost to the total value of a pipeline project but if incorrectly selected, sized and positioned, could result directly or indirectly into a host of pipeline destructive phenomena including Surge, Waterhammer, corrosion and high energy consumption. The last […]
Empirical research confirms in over a decade of results conducted by several researchers on a variety of conditions, that the most critical factor that determines the creation of surge and waterhammer on closure of the Large Orifice of an Air Valve, or the prevention thereof, is the size of the Orifice at that critical point […]
