prEN 488 rev

District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene prEN 488 rev

Scope

This European Standard specifies requirements and test methods for valves of prefabricated thermally
insulated valve assemblies comprising a steel valve, rigid polyurethane foam insulation and an outer casing of
polyethylene for use in directly buried hot water networks with pre-insulated pipe assemblies in accordance
with EN 253.
This European Standard applies only to factory made prefabricated insulated valve assemblies for continuous
operation with hot water at various temperatures in accordance with EN 253, Clause 1 and the valve
assemblies with a maximum operation pressure of 25 bar. For higher pressures, additional demands apply.
NOTE For this application, the following valve types are commonly used: ball valves, gate valves, and butterfly
valves.
This European Standard does not include calculation rules for loads and stresses. These depend on the
configuration of the system as it is installed. The design and installation rules are given in EN 13941