Safety
 The
NHS TMV Scheme
“It is imperative that patients, residents
and staff are not scalded by water issuing at unbearable or
dangerous temperatures from outlet fittings in healthcare
and premises used by the public.”
Each thermostatic
valve has undergone third party testing to the requirements
of the NHS Estates Model Engineering Specification DO8, and
has been awarded a licence by the TMV Scheme, certifying that
they are suitable for use as Type 3.
The Health Guidance Note (HGN) makes reference
to three types of valves:
Type 1
- A mechanical mixing valve with maximum temperature stop
including single lever taps.
Type 2
- A thermostatic mixing valve with maximum temperature stop,
complying with BS1415 part 2.
Type 3
- A thermostatic mixing valve with enhanced thermal performance
complying with NHS Estates purchasing specification DO8.
Type 3 Thermostatic
Mixing Valves are suitable for use when the hot and cold
water supplies to the valves are normally within the limits
specified in table 1 below for each operating range. Only
thermostatic mixing
valves with no user-accessible adjustment of the mixed
water temperature should be used where more than one outlet
may discharge simultaneously when operated by more than one
user at the same time.
Type 3 Thermostatic
Mixing Valves having user-accessible adjustment may not
be used for supplying two different maximum mixed water temperatures;
e.g. Bath/shower mixers
unless the movement of the diverter mechanism or some other
device will automatically adjust the temperature to the maximum
mixed water temperature allowed for that mixed water outlet.
| Operating
Pressure Range |
High
Pressure |
Low Pressure |
| Maximum static pressure
- bar |
10 |
10 |
| Flow pressure, hot and cold
- bar |
1 to 5 |
0.2 to 1 |
| Hot supply temperature -
°C |
52 to 65 |
52 to 65 |
| Cold supply temperature
- °C |
5 to 20 |
5 to 20 |
|
Additional information
If you cannot find what you are looking for
or need further assistance with safety thermostatic valves,
please contact us.
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suppliers for a list of your nearest local suppliers of
quality shower and shower accessories throughout the uk.
Click
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| 
