Standards Development

Scope

This document defines the minimum performance requirements which apply to industrial isolating and check valves claiming compliance with valve product standards. It specifies test procedures and acceptance criteria for each performance requirement of this document. Valves for specific use are excluded from this standard:

a) valves to be used in water supply pipe system in accordance with EN 1074 (all parts);

b) valves to be used in gas distribution system with pressure lower than 16 bar in accordance with EN 13774;

c) valves to be used in natural gas transportation in accordance with EN 14141;

d) valves to be used for low-temperature applications in accordance with EN ISO 28921 (all parts);

e) control valves in accordance with EN 1349;

f) safety devices in accordance with EN ISO 4126 (all parts);

g) thermoplastic valves in accordance with EN ISO 16135, EN ISO 16136, EN ISO 16137, EN ISO 16138, EN ISO 16139, EN ISO 21787.

Purpose

The purpose of this document is to define the minimum performance of industrial valves included in the scope of CEN/TC 69. For years, the only required performance test has been the seat test P12 (according to EN 12266-1) carried out by the manufacturer at the end of production. In assessing potential valve seat leakage after a number of OPEN/CLOSE/OPEN cycles the user has had to rely on either manufacturers’ references or his own operational experience of a particular manufacturer.

A seat leakage endurance performance test method is defined together with performance levels that are considered to represent a range from minimum to good performance. The purpose of the endurance test method is not to be representative of the end user processes. These are very varied and not easily duplicated in any cost effective test loop. The purpose is to demonstrate the valve capacity to maintain its seat tightness performance after opening the valve repeatedly against water pressure at room temperature in laboratory conditions. This is intended to enable comparison between the endurance performance of different manufacturers’ product in a similar way to other type testing such as EN ISO 10497 and EN ISO 15848-1.