Ensuring environmental protection through tightness: the influence of modern valves on emission prevention
Abstract
Through enhanced sealing systems, contemporary industrial valves play a huge role in helping prevent emissions and comply with environmental regulations in the process industry.
1. Introduction
Globally, the demand for an environmentally friendly industry is getting louder. The focus is often on the process industry, and on the understated but crucial component: valves. A large proportion of industrial emissions are generated by tiny leaks in valves, connections, or seals. This is precisely where the problem lies - but also the way to a solution. Many of these emissions can be easily avoided if valves are reliably sealed. This article is about how modern valve technology can accomplish that, and consequently make a quiet but important contribution to environmental protection.
2. Problem definition: Emissions from valves
Industrial plants release significant amounts of hazardous gases every year into the environment - often called „fugitive emissions“, from their valve bodies, stem seals, or flange connections. In addition to environmental and human risk, they can also lead to financial losses and regulatory breaches. Valves are often used in extreme temperature-pressure conditions and harsh media. This is especially true for chemical, petrochemical, and energy-generating plants. Due to this, the development of reliable and durable sealing solutions is so challenging. The balance of tightness and environmental responsibility is crucial, without compromising performance.
3. Norms and standards for limiting emissions
To reduce fugitive emissions, various international regulations define requirements for the tightness of fittings:
TA Luft (Technische Anleitung zur Reinhaltung der Luft) – German standard, relevant for the EU area. It requires proof of low-emission construction types under ISO 15848 or VDI 2440.
ISO 15848-1/2 – International standard for measuring emissions from valves under operating conditions (type examination and production monitoring).
EPA LDAR (Leak Detection and Repair, USA) – Defines systematic testing and monitoring measures for leakage sources in systems.
API 622 / 624 / 641 – American standards for low-emission packings, valves and equipment, especially in the oil and gas industry. Today, compliance with these standards is not only a regulatory requirement, but is also becoming increasingly necessary from an economic perspective - especially in the context of ESG targets and sustainability certifications.
4. State-of-the-art: Innovative technologies for reducing emissions from industrial valves
With the increased requirements for environmental accountability, operational safety and compliance with regulations, advanced solutions have become established in valve technology. These technologies enable a significant reduction in fugitive emissions and represent the current status of technology for the low-emission design of industrial valves.
One of the most efficient technologies is the use of bellows sealing systems. Bellows seals completely separate the medium from the atmosphere through multi-layer metal bellows. This solution ensures absolute tightness even at high pressures and temperatures and is primarily used in sensitive applications such as the chemical and nuclear industries. The complete encapsulation of the stem eliminates dynamic sealing surfaces and results in maintenance-free operation over numerous actuation cycles. Bellows sealed valves meet the requirements of current emission standards such as TA Luft, ISO 15848 and API 624.
At the same time, low-emission packing systems based on high-density materials such as expanded graphite or PTFE compounds have been developed. These packings usually have a multi-layer design and are kept at a constant sealing force by pre-tensioned systems, often in combination with spring-loaded elements. This compensates for loosening of the packing and prevents leaks over the service life of the valve. In addition, thermal decoupling is used between the process medium and the spindle area to minimize ageing of the seal.
The use of additive manufacturing is an exciting development in valve technology. Thanks to 3D printing, it is now possible to produce sealing elements and housing shapes that were previously technically almost impossible or extremely difficult to manufacture. Complex geometries, specially adapted to the medium used or the flow conditions, can be manufactured to fit precisely and save material. This opens up new possibilities for minimizing leakage paths - directly in the design process. Where compromises in sealing surface design were previously necessary, 3D printing now allows maximum functionality while reducing emission risks at the same time.
Double sealing systems with a monitored cavity are used particularly in sensitive applications. A cavity is provided between two rows of packing, which is either filled with inert gas or pressure-monitored. If a leak occurs, this is detected immediately via pressure changes or media leakage in the interstitial space. This technology enables reliable early detection and meets the highest safety requirements, especially for toxic or highly reactive media.
Utilizing low-wear materials, particular coatings like Diamond-Like-Carbon (DLC), or focused surface finishes, minimizes the friction between the spindle and seal. This results in less heat generation, less abrasion, and a significantly longer service life for the sealing systems, which in turn minimizes the likelihood of leaks during operation.
It is fair to say that technological progress in the field of low-emission valves and fittings is making a significant contribution to the ecological transformation of the process industry. The combination of mechanical precision, digital intelligence, and innovation in materials technology now enables a level of protection that was unimaginable just a few years ago. These solutions are not just a response to regulatory pressure, but also a key component of sustainable plant technology.
5. Conclusion
The tightness of industrial valves is a key element in the fight against industrial emissions. Evolving valve technology makes emission prevention possible and helps companies to comply with environmental regulations and operate more sustainably. The technological advancement, particularly in sealing technology and sensor integration, is opening up new avenues for a low-emission and sustainable process industry. The investments in low-emission systems are not only a cost factor, but a strategic necessity.