With the continuous progress in industrial technology, the need for materials and technologies that meet the highest demands is also growing. This need is particularly evident when dealing with corrosive applications. In this context, the three-piece ball valve of the DG1 series stands out, which is made of the particularly corrosion-resistant material 1.4529 and was specially developed for such demanding areas of application.

In key modern industries such as the chemical, oil and gas as well as water treatment industries, corrosion resistance and reliability are crucial. Choosing the right materials and components can make the difference between smooth running operations and costly downtime. This is where the corrosion-resistant three-piece ball valve made from 1.4529 plays a key role. But what makes this material and this ball valve so special and how can it help you?

As a German manufacturer of industrial valves, we have set ourselves the challenge of providing high-quality, corrosion-resistant materials for the most demanding applications. The three-piece ball valve from the DG1 series has also been available for some time in the material variant 1.4529 and can be supplied with short delivery times. This high-alloy super austenite offers exceptional resistance to pitting, stress corrosion and crevice corrosion.

1.4529 (Alloy 926) is a highly alloyed, stainless super austenite with a high molybdenum content and low nitrogen content. This special chemical composition gives the material its outstanding corrosion resistance and makes it the preferred choice for applications where conventional stainless steels reach their limits.

• Material: 1.4529 (Alloy 926)
• Resistance: High resistance to pitting, stress corrosion and crevice corrosion
• Chemical composition: High molybdenum content, low nitrogen content
• Construction: Three-part design for easy maintenance and high reliability

Our products offer comprehensive automation solutions that meet the highest standards. The standard mounting flange in accordance with EN ISO 5211 enables direct actuator mounting without interrupting the stem. Depending on requirements, pneumatic, electric or manual actuators can be used.

In terms of safety, our products are characterized by ease of maintenance thanks to the spring-loaded V-rings made of PTFE or graphite packings. A TA-Luft is also available as an option to ensure additional safety.

The internal primary sealing, combined with anti-blowout stem, ensures leakage-free operation. This combination guarantees reliable tightness and safety, even with high switching frequencies.

The separate, fully encapsulated body seal ensures a secure sealing.

Our products are particularly easy to service and precise to install. The fully centered screw guide guides the middle section precisely to the flanges, which enables optimum storage and easy installation.

The surface of the ball is high-gloss polished and is characterized by an extremely precise contour accuracy, which guarantees exact roundness.

The seat rings ensure absolute tightness in the passage thanks to their special form. The preload of the seat rings causes a spring effect that enables reliable sealing in all pressure ranges. Available materials: PTFE, PTFE/glass, PTFE/carbon, PEEK, UHMWPE, POM and PVDF.

Further product information can be found here:

GEFA-Kugelhahn DG1 1.4529

Industrial production is faced with the constant challenge of finding efficient and reliable solutions for dealing with high pressures. This is particularly important in areas such as water management and the treatment of sewage sludge. In this article, you will learn how GEFA high-pressure knife gate valves, in particular the AT300 and AT750 models, act as specialists for these special requirements.

High-pressure valves are specialized devices designed to withstand extreme pressure conditions in industrial processes. They are indispensable in applications where liquids, suspensions or gases need to be transported under high pressure. These valves not only ensure safe transport, but also minimize the risk of leaks or failures that could cause significant safety and environmental problems.

Dealing with high pressures poses numerous challenges. On the one hand, there is the risk of material failure, which can be caused by improper design or material fatigue. The tightness of the systems must also be guaranteed in order to prevent leaks. In addition, the maintenance of such high-pressure systems requires special expertise in order to minimize downtimes and reduce operating costs.

GEFA has established itself as a leading supplier in this field with its AT300 (SD3) and AT750 (SD75) series of high-pressure knife gate valves. These valves are specially designed for use in demanding environments and offer reliable solutions for handling sewage sludge and biomass under high pressure conditions.

High pressure gate valve AT300

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High pressure gate valve AT750

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• Robustness and durability: 
  The design of GEFA knife gate valves ensures that they are highly resistant to wear and material fatigue, which extends their service life.
• Low-maintenance design:
  Thanks to the innovative seal systems and high-quality materials, maintenance requirements are significantly reduced, which lowers operating costs.
• Various application possibilities: 
  The knife gate valves are available in various nominal widths and lengths and can therefore be adapted to specific system requirements.

The main applications for GEFA high-pressure knife gate valves are in the conveying of mechanically dewatered sewage sludge or biomass with a high dry matter content. These systems are used on chamber filter presses, centrifuges for sewage sludge drying and in the piping systems of fermentation and biogas plants. Here, the valves have proven to be reliable and efficient for years.

For more information about GEFA high-pressure knife gate valves and their benefits, we recommend contacting one of our experts directly or exploring additional information on our website. Benefit from our expertise and learn how GEFA can help you optimize your processes and gain a sustainable competitive advantage.