Low Fugitive Emissions Valves for Mining Projects

2. The operational conditions

The operational conditions can be in the following parameters for a plug valve for fluctuating temperatures:

Firesafe DIN-EN:

• DN 15 – 600

• PN 10 – 40

ASME:

• NPS ½“– 24“

• Class 150 – 300

PT range:

• -30 < T < 230/280°C

• Vacuum 10-8 mbar.

3. The material of construction used

The nature of some liquids or solids can accelerate the wear of valves. Thanks to tons of experience gathered from and investment in continuous product research and development, AZ-Armaturen South Africa (Pty) Ltd has built a reputation as an expert in “3D media”: Dirty, Difficult, and Dangerous.

“Depending on the media, the pressure and the temperature combination of the application, the right combination of standards materials for the body and the plug, as well as the sealing materials are chosen by the client´s process expert,” explain the Application Engineers.

Typical standard body materials include:

Carbon Steel 1.0619, ASTM A216 WCB

Stainless Steel 1.4408, ASTM A351 CF8M

Stainless Steel 1.4308, ASTM A351 CF8

Unalloyed stainless-steel casting (low Temp.)

1.1138

LCC/LCB/A352

The standard plug materials include:

Stainless Steel 1.4408, ASTM A351 CF8M

Stainless Steel 1.4308, ASTM A351 CF8

Available special materials, with which the company is also familiar, are:

• Ductile cast iron EN-JS1049, ASTM Gr 60-40-18 / A395

• Alloy

• Monel

• Nickel

• Zirconium

• Titan

• Tantalum and other materials on request according to the application

4. Adherence to quality standards

The popularity of AZ-Armaturen’s low-emission valves pivots around quality. The FSN-sealing range for Low-Emission-Valves is certified and classified according to ISO 15848-1 and API 641.

High-quality standard is evident in two sealing systems for the low emission range:

• Firesafe safety sealing (API 607) Type FSN for fluctuating temperatures with 3x graphite packing (adjustable) for additional stem sealing; Tmax 280°C

• Firesafe safety sealing (API 607) Type FSN-SL for fluctuating temperatures with 3x graphite packing (live loaded disc springs) for additional stem sealing; Tmax 280°C.

Industry endorsement

Low-emissions valves have been endorsed by the industry. Thus, far, there has been positive feedback from clients on their experience of switching to AZ-Armaturen low-fugitive emissions valve brands. “A multitude of miningrelated industries and large players in the mining industry itself relies on our valves and have hundreds installed. Due to discretion, we cannot disclose them in detail. However, there are several SA Industry heavyweights included.”

Tapping into close to 40 years experience

AZ-Armaturen South Africa (Pty) Ltd is the only local manufacturer of this type of industrial valve in Southern Africa. The company manufactures valves, strainers, check valves, and pressure-free sampling systems for the local industry for close to 40 years.

AZ-Armaturen also offers refurbishment of valves. Refurbishment of valves can usually be done in a short time and at a very competitive price compared to a new valve. Its workshop is fully equipped with the required experts and machinery. Even more, it also features a large stock level, which allows short turnaround time for a multitude of valves.

free of cavities & maintenance

Product range

Plug Valves with PTFE-sleeve two-way and multi-way valves

HIGH PERFORMANCE valves for processes with demanding requirements

Valves with PFA / FEP lining full safety for operator and environment

Sampling systems safe, representative, reliable

Control plug valves precise equal percentage or linear control

Piping accessories metallic or with PFA / FEP lining, lined strainers, lined ball check valves, lined sightglasses

Actuation aligned, verified and tested components

Special solutions customized plug valves made of cast and forged special materials