EN 817-2008 pdf download.Sanitary tapware – Mechanical mixing valves ( PN 10 ) -General technical specifications.
8 Leaktightness characteristics
8.1 General
This clause describes the test methods that shall be carried out to verify the Ieaktightness of the mechanical mixing valve and specifies the corresponding requirements (see 0).
8.2 Test methods
8.2.1 Principle
The principle of the test consists of checking under cold water pressure the leaktightness of:
— the obturator (see 8.3);
the complete mixing valve (see 8.4);
— the bath/shower diverter (either manual or with automatic return) (see 8.5 and 8.6).
In the case of a diverter with automatic return being considered to provide backflow prevention, it shall comply with
the requirements of EN 14506.
8.2.2 Apparatus
A hydraulic test circuit capable of gradually supplying the required static and dynamic pressures and of maintaining them throughout the duration of the test(s).
8.3 Leaktightness of the obturator and of the mixing valve upstream of the obturator with the obturator in the closed position
8.3.1 Procedure
a) Connect the mixing valve to the test circuit:
b) with the outlet orifice open, and the obturator closed:
C) apply to the inlet of the mixing valve a water pressure of (1,6 ± 0,05) MPa [(16,0 ± 0,5) bar] and maintain It for
(60 ± 5) s.; during this period, move the temperature control device over its full operating range.
8.3.2 Requirements
— Verification of leaktightness upstream of the obturator:
— throughout the duration of the test there shall be no leakage or seepage through the walls:
— Verification of leaktightness of the obturatoi-:
— throughout the duration of the test there shall be no leakage of the obturator, i.e. at the outlet.
8.4 Leaktightness of the mixing valve downstream of the obturator with the obturator open
8.4.1 General
Not applicable when the outlet cannot be closed.
8.4.2 Procedure
a) Connect the mixing valve to the test circuit:
b) with the outlet orifice(s) artificially closed, and the obturator open;
C) apply to the inlet of the mixing valve a water pressure of (0,4 ± 0,02) MPa ((4,0 ± 0,2) bar] and maintain It for (60 ± 5) s; during this period, move the temperature control device over its full operating range:
d) reduce gradually the pressure to (0,02 ± 0,002) MPa ((0,2 ± 0,02) bar] and maintain It for (60 ± 5) s.
8.4.3 Requirement
Throughout the duration of the test there shall be no leakage, or seepage through the walls.
8.5 Leaktightness of manually operated diverter
8.5.1 Procedure: flow to bath
a) Connect the mixing valve, in its normal position of use, to the test circuit;
b) put the diverter in the flow-to-bath mode, the outlet to bath being artificially closed and the outlet to shower open;
c) apply a static water pressure of (0,4 ± 0,02) MPa ((4,0 ± 0,2) bar] and maintain it for (60 ± 5) s:
d) gradually reduce the pressure to (0,02 ± 0002) MPa ((0.2 ± 0.02) bar] and maintain It for (60 ± 5) s;
e) check for leakage at the outlet to shower.
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EN 81 7:2008 (E)
8.5.2 Requirement: flow to bath
There shall be no leakage at the outlet to shower.
8.5.3 Procedure: flow to shower
a) Put the diverter in the flow-to-shower mode, the outlet to shower being artificially closed and the outlet to bath open;
b) apply a static water pressure of (0.4 ± 0,02) MPa ((4,0 ± 0,2) bar] and maintain it for (60 ± 5) s;
c) gradually reduce the pressure to (0,02 ± 0,002) MPa ((0,2 ± 0,02) bar] and maintain it for (60 ± 5) s;
d) check for leakage at the outlet to bath.
8.5.4 Requirement: flow to shower
There shall be no leakage at the outlet to bath.
8.6 Leaktightness and operation of diverter with automatic return
8.6.1 Procedure: flow to bath
a) Connect the mixing valve, in its normal position of use, to the test circuit;
b) connect the hydraulic resistance corresponding to the flow rate class marking — see EN ISO 3822-4 to the shower outlet (for example: for marking A, class A resistance will be used during testing);
c) put the diverter in the flow-to-bath mode with the outlets to bath and shower open;
d) apply a dynamic pressure of (0,4 ± 0,02) MPa ((4,0 * 0,2) barJ and maintain it for (60 ± 5) s:
e) check for leakage at the outlet to shower.
8.6.2 Requirement: flow to bath
There shall be no leakage at the outlet to shower.
8.6.3 Procedure: flow to shower
a) Put the diverter in the flow-to-shower mode with the outlets to bath and shower open;
b) apply a dynamic pressure of (0,4 ± 002) MPa ((4,0 ± 0,2) barj and maintain it for (60 ± 5) s;
c) check for leakage at the outlet to bath:
d) gradually reduce the pressure to (0,05 ± 0,002) MPa ((0,5 ± 0,02) barj and maintain it for (60 ± 5) s;
e) check the diverter position and check for leakage at the outlet to bath;
f) dose the mixing valve obturatoc check the diverter position.
8.6.4 Requirement: flow to shower
— There shall be no leakage at the outlet to bath whilst the diverter remains in the flow to shower position;
— the diverter shall not return to the flow to bath position at any pressure  (0,05 * 0.002) MPa ((0,5 ± 0.02) bar];EN 817-2008 pdf download.