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  • BSI
    BS 7942:2011 Thermostatic mixing valves for use in care establishments. Requirements and test methods
    Edition: 2011
    $526.05
    / user per year

Description of BS 7942:2011 2011

This British Standard specifies performance and material requirements and gives test methods for three types of TMV, of nominal size up to and including DN25, for use in care establishments. The TMVs covered by this standard are those which are suitable for the hot and cold water supply pressures and temperatures given in Table 1, and those which are suitable for the applications given in Table 2.

Annex A to Annex E give the apparatus and test methods for the durability of TMVs, Annex F to Annex M and Annex O to Annex S give the apparatus and test methods for the performance of TMVs. Annex N gives an assessment of transient values, Annex T gives a summary of thermal performance requirements and Annex U and Annex V give recommendations for commissioning and in-service tests.

Table 1 TMV general use conditions

Pressure/temperature range High pressure (HP) Low pressure (LP)
Operating pressure
 Maximum static water pressure (MPa) 1.0 1.0
 Flow pressure, hot and cold (MPa) 0.1 to 0.5 0.02 to 0.1
Operating temperature
 Hot supply temperature (°C) 55 to 65 55 to 65
 Cold supply temperature (°C) 5 to 20 5 to 20

Table 2 Mixed-water temperature

Application Designation A) Mixed-water temperature (at point of discharge)

°C max.
Bidet HP-B, BE; LP-B, BE 38
Shower HP-S, SE; LP-S, SE 41
Washbasin HP-W, WE; LP-W, WE 41
Bath (44 °C fill) HP-T44; LP-T44 44
Bath (46 °C fill) HP-T46; LP-T46 46
Bath and shower mixer (44 °C bath fill) HP-D44; LP-D44 41 (shower);
44 (bath)
Bath and shower mixer (46 °C bath fill) HP-D46; LP-D46 41 (shower);
46 (bath)

NOTE For washbasins, washing is assumed to take place under running water.

A) A TMV with a diverter designation (D) has the capability to change and control the mixed-water outlet temperature in line with the temperatures defined above when the supply path is changed from bath to shower or shower to bath.


Standard NumberBS 7942:2011
TitleThermostatic mixing valves for use in care establishments. Requirements and test methods
StatusConfirmed
Publication Date2011-01-31
ReplacesBS 7942:2000
DescriptorsDesignations, Performance testing, Mixing valves, Valves, Thermal testing, Pressure, Sanitary appliances, Temperature, Thermostatic valves, Commissioning, Leak tests, Performance, Installation, Health and welfare facilities, Hot-water supply systems, Marking, Baths, Instructions for use, Flow rates, Nursing homes, Durability, Water valves, Temperature control, Showers, Endurance testing, Draw-off taps, Hospitals, Water, Bidets, Cold-water supply systems, Wash-basins
ICS91.140.70 Sanitary installations
CommitteeB/504/-/8
ISBN978 0 580 63237 2
PublisherBSI
Pages60

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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