Low Fugitive Emission Plug Valves
- AZ Sealing System Solutions for a cleaner and safer environment
- According to ISO 15848, TA-Luft and API 641
AZ-Armaturen South Africa (Pty) Ltd is the only local manufacturer of this type of industrial valve in Southern Africa. We manufacture valves, strainers, check vales, and pressure-free sampling systems for the local industry for almost 40 years. We also offer the refurbishment of valves. Refurbishment of valves can usually be done in short time and at very competitive price compared to a new valve. Our workshop is fully equipped with the required experts and machinery. We also feature a large stock level, which allows short turnaround time for a multitude of valves.
ISO 15848 and API 641 set highest standards to protect people and the environment against volatile emissions and to save valuable resources.
What are fugitive emissions?
- Fugitive emissions are uncontrolled emissions of media from process plants
- This applies in particular to volatile organic compounds (VOC), such as benzene, methane, or ethanol as well as other harmful media
- At valves these emissions mainly occur at the stem
The design to cope with the stubborn challenge of emissions
Regarding the design of plug valves and related equipment, the emphasis is on the following characteristics:
- Free of cavities
- Maintenance free
- Self-lubricating
- Mounting-flange for actuators acc. to DIN ISO 5211
- Easily accessible adjustment of the plug, even with mounted actuator
- Vacuum tight
- Fugitive emission resp. German clean air act certified (TA-Luft 2002 approval)
- Certified acc. to Directive 2014/68/EU
- Firesafe design API 607 / ISO 10497
The operational conditions can be in the following parameters for a plug valve for fluctuation 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
Material of construction used (nature of some liquids or solids can accelerate wear)
We are the experts for the “3D media”: Dirty, Difficult, and Dangerous.
Depending on the media, the pressure and the temperature combination of the application, the right combination of materials for the body, the plug and the sealing materials are chosen by the client´s process expert.
The 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
Adherence to quality standards of low emissions fugitive valves
Our FSN-sealing range for Low-Emission-Valves are certified and classified according to ISO 15848-1 und API 641. There are basically 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
Feedback from the industry on their experience of switching to Armaturen valve brands
A multitude of mining related industries and large players in the mining industry itself rely on our plug valves and have hundreds installed. Due to discretion, we cannot disclose them in detail, however there are several SA Industry heavyweights included.
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