| Anotace |
ČSN EN 12201-4 This document specifies the characteristics of valves or valve bodies made from polyethylene (PE) for buried and above ground applications, intended for the conveyance of water for human consumption, raw water prior to treatment, drains and sewers under pressure, vacuum sewer systems, and water for other purposes, with the exception of industrial applications. The intended use includes sea outfalls, laid in water and pipes suspended below bridges. 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 EN 12201-2 and EN 12201-3 respectively. Valves made from materials other than PE, conforming to the relevant standards can be used in PE piping systems according to EN 12201, provided that they have PE connections for butt fusion or electrofusion ends, conforming to EN 12201-3, or material transition joints (e.g. flanged joints). It also specifies the test parameters for the test methods referred to in this document. In conjunction with EN 12201-1, EN 12201-2, EN 12201-3 and EN 12201-5, this document is applicable to PE pipes, fittings and valves, their joints and joints with components of PE and other materials intended to be used under the following conditions: a) allowable operating pressure, PFA, up to 25 bar1; b) an operating temperature of 20 °C as a reference temperature. The EN 12201 series covers a range of allowable operating pressures and gives requirements concerning colours and additives This document covers valves for pipes with a nominal outside diameter dn <= 400 mm. |