Sanitary tapware. Mechanical mixing valves (PN 10). General technical specifications

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