Technical articles by ARI® experts

The team of experts at ARI® regularly contribute to and publish articles in specialist journals on the topic of industrial valves and engineered systems for the control, isolation, safety and draining of liquid and gaseous media.

Here is a selection of these technical articles for you to read.

Technical Articles

knowledge-specialist-articles-industrial-valves-ari-armaturen

Valve solutions for hydrogen applications

Thursday, April 1, 2021

Hydrogen is considered to be a versatile energy carrier of the future that does not emit direct greenhouse gases in use. At the same time, the medium hydrogen places high demands on valves. Hydrogen is the lightest element in the periodic table, has a high gravimetric energy density and can lead to material embrittlement under certain conditions. Key aspects to be considered when selecting valves for use in hydrogen are outlined in the following article:

Technical Articles

Advanced environmental protection – the ZETRIX way!

Tuesday, March 1, 2016

Both TA-Luft [1] and DIN EN ISO 15848-1 [2] [3] aim to mitigate or reduce fugitive emissions which are harmful to the environment and human health. TA-Luft is a comprehensive German regulation which specifies binding technical requirements for classified installations in accordance with the 4th Federal Emmission Control Act. EN ISO 15848-1 [2] [3] is an international standard which provides users with evaluation criteria for classifying valves (isolation and control devices), to enable different designs or brands to be compared. Although compliance with the requirements of TA-Luft is considered to be proof of a sealing system’s quality –not just in Germany but in many other countries too – EN ISO 15848-1 [2] [3] is playing an increasingly important role in the chemical, petrochemical and process industries.

Technical Articles

Operational Behaviour of Safety Valves with Constant Superimposed Backpressure

Wednesday, April 1, 2015

When selecting spring loaded safety valves, an accurate knowledge and consideration of the specific operating conditions are vital to ensure that these devices work reliably. As optimal resource use becomes an increasingly relevant criterion, plant owners focus particular attention on components that can be depended on absolutely – even at their physical limits. In the design of a safety valve, the existence of a backpressure must be considered in addition to the usual parameters for dimensioning. In this present report, the function of a safety valve is intended to be shown when a constant superimposed backpressure is present in the discharge and thus acts against the direction of opening of the safety valve.

Technical Articles

Water hammer in valves – solutions to improve stability

Monday, October 18, 2010

Very strong pressure pulses or surges, also referred to as water hammer, often occur in fluid-conducting pipes. The stresses on the pipes, valves and apparatus can be so high that the equipment concerned is damaged – or in extreme cases actually bursts. Before effective measures can be taken to combat this problem, it is important to analyse exactly which kind of water hammer is involved and what causes it. No matter how carefully a facility is planned and constructed, the risk of pressure surges cannot always be completely ruled out, particularly if the plant is modified or extended or the operating mode changes frequently. If the plant components are designed with sufficient stability, half the battle is won.

Technical Articles

Back pressure safety valves

Thursday, April 29, 2004

When dimensioning and selecting safety valves for vessels and installations, it is important that this fitting should not be considered as being separate from its supply and blow-off pipes. The pressure and flow situation in neighbouring pipes and installation components may have an appreciable adverse influence on the functioning of safety valves. The resulting reduction of the mass flow leads to a rise in pressure. In extreme cases, unstable functioning behaviour in the form of flutter and hammering may lead to the valve becoming torn away. An accurate knowledge of the behaviour of safety valves and of the admissible limits in relation to back pressure, is a condition of avoiding the problems described. Various regulations [1,2,3] either specify the admissible back pressure, or refer to the manufacturers of the safety valves.

Back to previous page

You may also be interested in

Here you will find related topics and further information about ARI-Armaturen.

Your ARI® plus: our comprehensive service

Benefit from our many years of experience and our comprehensive services!

To our service offers

Find the right ARI® product for you here

With over 20,000 products in more than 200,000 variants, we can meet the exact requirements of your industry and processes.

To our product catalogue

Knowledge: Technical articles

Technical articles by ARI® experts

Valve solutions for hydrogen applications

Advanced environmental protection – the ZETRIX way!

Operational Behaviour of Safety Valves with Constant Superimposed Backpressure

Water hammer in valves – solutions to improve stability

Back pressure safety valves

You may also be interested in

Your ARI® plus: our comprehensive service

Find the right ARI® product for you here

How can we help you?

Send us your message

Your concern:

Your concern:

Your contact at ARI®:

Your contact at ARI®:

Your contact at ARI®:

Your contact at ARI®:

Your contact at ARI®:

Are you looking for a local contact?