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BSI 21/30431933 DC:2021 Edition

BSI 21/30431933 DC:2021 Edition

$13.70

BS ISO 4437-4. Plastics piping systems for the supply of gaseous fuels. Polyethylene (PE) – Part 4. Valves

Published By Publication Date Number of Pages
BSI 2021 29
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This document specifies the characteristics of valves made from polyethylene (PE) for piping systems in the field of 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 PE pipes or fittings conforming to ISO/DIS 4437−2:2021 and ISO/DIS 4437-3:2021 respectively.

Valves made from materials other than PE, designed for the supply of gaseous fuels conforming to the relevant standards can be used in PE piping systems according to ISO 4437 , provided that they have PE connections for butt fusion or electrofusion ends, including integrated material transition joints, conforming to ISO 4437-3:2021 .

It also specifies the test parameters for the test methods referred to in this document.

In conjunction with Parts 1, 2, 3 and 5 of ISO 4437 , it is applicable to PE valves, their joints and to joints with components of PE and other materials intended to be used under the following conditions:

  1. a maximum operating pressure, MOP, up to and including 10 bar 1

    1

    1 bar = 0,1 MPa =105 Pa; 1 MPa = 1 N/mm2.

    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.

  2. an operating temperature between −20 °C to 40 °C.

NOTE 2

For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in ISO/DIS 4437-5 .

ISO 4437 (all parts) covers a range of maximum operating pressures and gives requirements concerning colours.

NOTE 3

It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.

This document covers valve bodies designed for connection with pipes with a nominal outside diameter d n ≤ 400 mm.

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BSI 21/30431933 DC
$13.70