ISO 6182-6:2020 pdf download

ISO 6182-6:2020 pdf download.Fire protection — Automatic sprinkler systems — Part 6: Requirements and test methods for check valves
1 Scope
This document specifies performance, requirements, test methods and marking requirements, for check valves used to supply water in automatic fire protection systems.
It is not applicable to trim valves.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs
ISO 898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse thread
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 check valve
valve that allows fluid flow in one direction only
3.2 clapper
type of sealing element
Note 1 to entry: See also sealing assembly (3.7).
3.3 corrosion-resistant material
bronze, brass, Monel® 1) metal, austenitic stainless steel, or equivalent metallic or plastic material conforming with the requirements of this document
3.4 flow velocity
speed of water flow through a valve expressed as the equivalent water velocity through a pipe of the same nominal size as the valve
3.5 rated working pressure
maximum service pressure at which a check valve is intended to operate
3.6 reinforced elastomeric element
element of clapper, clapper assembly or seat seals in a composite of an elastomeric compound with one or more other components
3.7 sealing assembly
main movable sealing element (such as a clapper) of the valve which prevents the reverse flow of air or water which maintains pressure in the system piping
Note 1 to entry: See also clapper (3.2).
3.8 sealing assembly seat ring
main fixed sealing element of a valve which prevents the reverse flow of water and which maintains pressure in the system piping
4 Requirements
4.1 Nominal sizes
The nominal size of a valve shall be the nominal diameter of the inlet and outlet connections, i.e. the pipe size for which the connections are intended. Sizes shall be not less than DN 25. The diameter of the waterway through the sealing assembly seat ring shall be permitted to be less than the nominal size.
4.2 Connections
4.2.1 All connections shall be designed for use at the rated working pressure of the valve.
4.2.2 The dimensions of all connections shall conform with the applicable requirements of International Standards. If International Standards are not applicable, national standards may be used.