BS EN 817:2008 Sanitary tapware. Mechanical mixing valves (PN 10). General technical specifications.
BS EN 817 specifies caracteristics with which mechanical mixing valves need to comply. Specifically, it specifies dimensional, leak tightness, pressure resistance, hydraulic performance, mechanical strength, endurance and acoustic characteristics.
BS EN 817 also provides laboratory test methods to verify these characteristics.
BS EN 817 applies to PN 10 mechanical mixing valves for use with sanitary appliances installed in rooms used for bodily hygiene (cloakrooms, bathrooms, etc.) and in kitchens, i.e. for use with baths, wash basins, bidets, showers and sinks.
Replaces BS EN 817:1998
Contents of BS EN 817:
ForewordIntroduction
Scope
Normative references
Terms and definitions Designation
Marking and identification
Marking Identification
Materials
Chemical and hygiene requirements
Exposed surface conditions
Dimensional characteristics
General remarks
Inlet dimensions
Outlet dimensions
Mounting dimensions
Special cases
Flexible hoses for shower outlets
Shower outlets
Sequence of testing
Leaktightness characteristics
General
Test methods
Leaktightness of the obturator and of the mixing valve upstream of the obturators with the
obturator in the closed position.
Leaktightness of the mixing valve downstream of the obturator with the obturator open
Leaktightness of manually operated diverter
Leaktightness and operation of diverter with automatic return
Leaktightness of the obturator: cross flow between hot water and cold water
Pressure resistance characteristics – mechanical performance under pressure
General
Principle
Apparatus
Mechanical behaviour upstream of the obturator – obturator in the closed position
Mechanical behaviour downstream of the obturator – obturator in the open position
Hydraulic characteristics
General
Initial settings
Principle
Apparatus
Procedure
Determination of flow rate
Determination of sensitivity
Mechanical strength characteristics - torsion test for operating mechanism
General
Test method
Mechanical endurance characteristics
Mechanical endurance of the control device
Mechanical endurance of diverters
Mechanical endurance of swivel spouts
Backflow protection .
Acoustic characteristics
General
Procedure
Requirements
Apparatus
Pressure take-off tee
Bibliography
