ISO 16486-4:2022 pdf – Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 4: Valves

ISO 16486-4:2022 pdf – Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 4: Valves.
1 Scope This document specifies the characteristics of valves made from unplasticized polyamide (PA-U) in accordance with ISO 16486-1, intended to be buried and used for the supply of gaseous fuels. It is applicable to isolating unidirectional and bi-directional valves with spigot ends or electrofusion sockets intended to be fused with PA-U pipes or fittings conforming to ISO 16486-2 and ISO 16486-3 respectively. Valves made from material other than unplasticized polyamide designed for the supply of gaseous fuels conforming to the relevant standards are permitted to be used in PA-U piping systems according to the ISO 16486 series provided they have relevant PA-U connections for butt fusion or electrofusion ends (see ISO 16486-3). The component, i.e. the complete valve, is required to fulfil the requirements of this document. This document also specifies the test parameters for the test methods it describes. In conjunction with ISO 16486-1, ISO 16486-2, ISO 16486-3 and ISO 16486-5, this document is applicable to PA-U valves and their joints and to joints with components of PA-U and other materials intended to be used under the following conditions: a) a maximum operating pressure (MOP) of up to and including 18 bar 3) , or limited to 16 bar under regional CEN requirements, at a reference temperature of 20 °C for design purposes; NOTE 1 For the purpose of this document and the references to ISO 8233, MOP is considered to be nominal pressure. b) an operating temperature of −20 °C to 40 °C; NOTE 2 For operating temperatures between 20 °C and 40 °C, derating coefficients are specified in ISO 16486-5. This document covers valves for pipes with a nominal outside diameter, d n , ≤ 400 mm. 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.
ISO 8233, Thermoplastics valves — Torque — Test method ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous fuels and hydrocarbon fluids ISO 16486-1, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 1: General ISO 16486-2, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 2: Pipes ISO 16486-3:2020, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA- U) piping systems with fusion jointing and mechanical jointing — Part 3: Fittings ISO 16486-5, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 5: Fitness for purpose of the system ISO 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow rate/pressure drop relationships EN 682, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids EN 736-1, Valves Terminology — Part 1: Definition of types of valves EN 736-2, Valves Terminology — Part 2: Definition of components of valves EN 1680, Plastics piping systems — Valves for polyethylene (PE) piping systems — Test method for leaktightness under and after bending applied to the operating mechanisms EN 1704, Plastics piping systems — Thermoplastics valves — Test method for the integrity of a valve after temperature cycling under bending EN 1705, Plastics piping systems — Thermoplastics valves — Test method for the integrity of a valve after an external blow EN 12100, Plastics piping systems — Polyethylene (PE) valves — Test method for resistance to bending between supports
3.1 General 3.1.1 external leaktightness leaktightness of the valve body (3.1.4) enveloping the space containing the gas, with respect to the atmosphere 3.1.2 internal leaktightness leaktightness between the inlet and the outlet of the valve, with the valve in the closed position 3.1.3 leakage emission of gas from a valve body (3.1.4) or any component of a valve 3.1.4 valve body main part of a valve which contains the obturating device (closing element), the seat, the packing seals and the operating stop, as applicable and provides the terminal ends for connection to the PA-U pipe/ fittings 3.1.5 operating device part of a valve for connection with the operating key which allows the opening and the closing of the valve 3.2 Terms relating to design 3.2.1 full bore valve valve with a flow section equal to or greater than 80 % of the section corresponding to the nominal inside diameter of the body end port[SOURCE: EN 736-3:2008, 3.3.1] [4] 3.2.2 clearway valve valve designed to have an unobstructed flow way, which allows for the passage of a theoretical sphere with a diameter that is not less than the nominal inside diameter of the body end port[SOURCE: EN 736- 3:2008, 3.3.2]