Impact of revision of the TA-Luft on the valve industry

Impact of revision of the TA-Luft on the valve industryThe revised TA-Luft refers to ISO 15848-1 to protect the general public and the neighborhood. And to prevent harmful effects on the environment caused by air pollution. All that in order to achieve a high level of protection for the environment as a whole.

From December 1, 2025, shut-off or control devices such as valves, gate valves or ball valves should be used that meet the leakage rate LB (≤ 10-4 mg/s-m) based on the circumference of the stem for pressures up to ≤ 40 bar and design temperatures ≤ 200 °C and the leakage rate LC (≤ 10-2 mg/s-m) based on the circumference of the stem for pressures up to ≤ 40 bar and design temperatures > 200 °C for the test medium helium or other suitable test media, for example methane. At pressures of > 40 bar and design temperatures ≤ 200 °C, the leakage rate LC (≤ 10-2 mg/s-m) must be fulfilled in relation to the shaft circumference and should be achieved at > 200 °C.

Seals of spindle bushings designed as high-quality sealed metal bellows with a downstream safety stuffing box meet the requirements of the leakage rate LB without separate verification.

Otherwise, DIN EN ISO 15848-1 (November 2015 edition) or other proven equivalent test or measurement methods, such as the helium leakage test or the purge gas method, must be used to verify the specific leakage rate of the sealing systems, for testing and their evaluation and qualification.

In order to ensure long-term tightness, requirements for testing and maintaining the sealing systems must be specified in management instructions.