BS EN 1286:1999

Foreword
Introduction
1 Scope
2 Normative references
3 Definition
4 Classification
    4.1 Single control mechanical mixing valves
    4.2 Other mechanical mixing valves
5 Designation
6 Marking - Identification
    6.1 Marking
    6.2 Identification
7 Materials
    7.1 Chemical and hygienic characteristics
    7.2 Exposed surface condition and quality of coating
8 Dimensional characteristics
    8.1 General comment on drawing
    8.2 Low pressure mechanical mixing valves mounted on
          horizontal surfaces
    8.3 Mechanical mixing valves mounted on vertical surfaces
    8.4 Dimensions of water outlets
    8.5 Special cases
9 Leaktightness characteristics
    9.1 General
    9.2 Test methods
    9.3 Leaktightness of the mixing valve upstream of the
          obturator and of the obturator
    9.4 Leaktightness of the obturator: cross flow between
          hot water and cold water
    9.5 Leaktightness of the mixing valve downstream from
          the obturator
    9.6 Leaktightness of manual diverters
    9.7 Leaktightness of diverters with automatic return
    9.8 Summary of requirements
10 Hydraulic operating characteristics
    10.1 General
    10.2 Test method
    10.3 Apparatus
    10.4 Mounting and initial set-up procedure
    10.5 Determination of flow rate
    10.6 Sensitivity
11 Mechanical performance under pressure
    11.1 General
    11.2 Apparatus
    11.3 Testing the mechanical performance upstream of
          the obturator - Obturator in the closed position
    11.4 Testing the mechanical performance downstream of the
          obturator - Obturator in the open position
12 Mechanical endurance characteristics
    12.1 Mechanical endurance of the control device
    12.2 Mechanical endurance of diverters
    12.3 Mechanical endurance of swivel nozzles
13 Torsion resistance characteristics of the control
    13.1 General
    13.2 Test method
14 Protection against pollution of drinking water
Annex A (normative) Design of reducing adapters
Annex B (informative) Examples of pressure take-off tees
Annex C (informative) Low hydraulic resistance fittings
Annex D (informative) Summary of leaktightness tests

Defines requirements for low hydraulic resistance mechanical mixing valves designed to be used in low pressure water supply systems.

This European Standard specifies requirements for low hydraulic resistance mechanical mixing valves suitable for use in low pressure water supply systems as described in informative annex C.

This European Standard specifies:

• the dimensional, leaktightness, mechanical and hydraulic performance, mechanical endurance characteristics with which low pressure mechanical mixing valves shall comply;

• the procedure for testing these characteristics.

It is applicable:

• to low pressure mechanical mixing valves, intended for use on sanitary appliances in washrooms (toilets, bathrooms etc.) and in kitchens;

• to low pressure mechanical mixing valves used under the following pressure and temperature conditions given in Table 1.

NOTE Mechanical mixing valves for use at pressures in excess than those in Table 1 are covered by EN 817.