This standard establishes the standards and tightness classes of pipeline valves (hereinafter referred to as valves) with nominal diameters from DN 3 to DN 2000 for nominal pressures from PN 1 to PN 420 of all types (shut-off, check, safety, control, distribution and mixing, phase separation) and all types (gate valves, taps and butterfly valves), as well as for combined fittings. The tightness standards given in the standard are used for all types of tests, as well as when checking the tightness of the valve valve during operation. This standard is suitable for conformity assessment purposes