The "TA-Luft" (Technische Anleitung zur Reinhaltung der Luft) is a German regulation on air pollution control, whose first edition dates back to 1964, and most recently in 2002.
The TA-Luft approval is carried out on valves and similar products in reference to VDI 2440 Ed 2000, EN ISO 15848/1-2, Technical Instruction on Air Quality Control n. 18.104.22.168 (TA-Luft).
The manufacturer shall identify the type of valve and seal that must be certified and prepare an appropriate operating procedure. This test involves the artificial aging of the valve in the usual conditions of service in the presence of an inert tracer gas like helium.
Before and after the leak test of the valve, functional tests are performed, such as opening and closing.
Once the phases of control and verification are completed, the control certificates are drawn up (by the manufacturer, if equipped with qualified personnel and equipment at Level II in the LT method, or by the laboratory that performed the tests). The inspector countersigns these certificates and then he issues an inspection report that will be the basis for the certificate, which identifies the type of product under consideration. The latter has a range of applicability specified in the reference standards and may be produced by the manufacturer as long as no significant changes occur at the design level.
With a similar procedure to that described for the “TA-Luft”, the fire safe approval may also be obtained. In reference to API 607, API 6FA and EN ISO 10497 the sealing ability of the valves will be tested and assessed, subject to specific conditions of thermal stress, by exposure to flames.