Devices to prevent pollution by backflow of potable water - In-line anti-vacuum valves DN 10 to DN 50 inclusive - Family D, type A

2Scope / Description

This document specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of in-line anti vacuum valve family D Type A.This document covers in-line anti vacuum valve family D Type A, intended to prevent pollution of potable water by backflow, caused by backsiphoning only.It is applicable to in-line anti vacuum valve in denominations DN 10 up to DN 50.It covers in-line anti vacuum valve of PN 10 that are capable of working without modification or adjustment:-  at any pressure, up to 1 MPa (10 bar);-  with any pressure variation, up to 1 MPa (10 bar);-  in permanent duty at a limited temperature of 65 °C and for maximum 1 h at 90 °C.It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.