KFR valve

from Wikipedia, the free encyclopedia
The articles check valve , non- return valve and KFR valve overlap thematically. Help me to better differentiate or merge the articles (→  instructions ) . To do this, take part in the relevant redundancy discussion . Please remove this module only after the redundancy has been completely processed and do not forget to include the relevant entry on the redundancy discussion page{{ Done | 1 = ~~~~}}to mark. Kai Kemmann ( discussion ) 03:38, 14 Apr. 2017 (CEST) (Copied from check valve - DAWR ( discussion ) 01:37, 17 Oct. 2019 (CEST))

A KFR-valve is a k ombiniertes F reistrom valve with R ückflussverhinderer . It is a straight-way valve , usually in the form of an inclined seat valve , which is particularly aerodynamically shaped (in order to cause little pressure loss and noise). The integrated, controllable backflow preventer secures the drinking water against backflow of the service water into the connection line of the utility company.

A KFR valve can be recognized by the test screw located in the direction of flow "in front of the valve disk". It is used to check the functionality of the backflow preventer. Many valves also have a small drain cock for emptying the pipeline, which is arranged in the flow direction "after the valve disc".

According to DIN EN 1717 (old DIN 1988), a backflow preventer must be installed at the house connection of the drinking water installation "in the direction of flow behind" the water meter . This usually takes place either in the form of a KFR valve, a combination with a water filter and pressure reducer or a separate non-return valve . This backflow preventer must always be kept in working order by the operator of the building installation. It must be checked regularly whether the valve actually does not allow any backflow.

A KFR valve must always be installed in accordance with the direction of the arrow marked on the valve, otherwise the valve disc may come off.

Web links