ISO/DIS 6182-6-2015 pdf free.Fire protection – Automatic sprinkler systems -Part 6: Requirements and test methods for check valves.
This part of ISO 6182 specifies performance, requirements. methods of test and marking requirements. for check valves used to supply water in automatic fire protection systems.
Note: This is not intended to include trim valves.
2 Normative references
The following referenced documents are indispensable for the application 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.check valve valve that permits flow of water into a pipe system. prevents the reverse flow of water.
3.2 clapper type of sealing assembly. wtiich includes rotational movement NOTE See also 3.8.
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 25 mm. 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 shall be permitted to be used.
4.3 Rated working pressure
4.3.1 The rated working pressure shall be not less than 1,2 MPa (12 bar).
4.3.2 The rated working pressure shall be specied by the manufacturer.
4.3.3 Inlet and outlet connections shall be permitted to be machined for lower working pressures to match installation equipment provided the valve is marked with the lower working pressure.
4.4 Bodies and covers
4.4.1 Bodies and covers shall be made of a material having corrosion resistance at least equivalent to cast iron.
4.4.2 Cover fasteners shall be made of steel, stainless steel, titanium, or other materials with equivalent physical and mechanical properties.
4.4.3 Non-metallic materials other than gaskets. diaphragms and seals or metals with a melting point less than 800 °C shall not form part of the valve body or cover.
4.4.4 For valves with a cover plate, it shall not be possible to assemble the valve with the cover plate in a position which either improperly indicates flow direction or prevents proper operation of the valve.
4.5 Strength (see 6.3)
4.5.1 An assembled valve, with the sealing assembly blocked open. shall withstand, without rupture, an internal hydrostatic pressure of four times the rated working pressure for a period of 5 mm, when tested as specified in 6.7.
4.5.2 If the test in accordance with 6.7 is not done with standard production fasteners, the supplier shall provide documentation showing that the calculated design load of any standard production fastener, neglecting the force required to compress the gasket. does not exceed the minimum tensile strength specified in ISO 898-1 and ISO 898-2 when the valve is pressurized to four times the rated working pressure. The area of the application of pressure shall be calculated as follows.
a) If a full-face gasket is used, the area of application of pressure is that extending out to a line defined by the inner edge of the bolts.
b) If an O”-ring seal or ring gasket is used, the area of application of force is that extending out to the centre line of the “O-nng or gasket.
4.6 Access for maintenance
Means shall be provided to permit access to workin9 parts and removal of the sealing assembly.ISO/DIS 6182-6 pdf free download.
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