BS 1415-2:1986

Foreword
Committees responsible
Specification
Section one. General
1. Scope
2. Definitions
3. Nominal size
4. Marking
Section two. Materials, design and construction
5. Materials
6. Castings
7. Hot-pressings
8. Connections
9. Plating
10. Method of operation
Section three. Performance
11. General
12. Flow rate test
13. Valve seat and body upstream tests
14. Body downstream tests
15. Hydraulic strength test
16. 'O' ring pneumatic test
17. Sensitivity of temperature control
18. Temperature stability of blend water under
     changing inlet pressure conditions
19. Temperature stability of blend water under changing
     temperature conditions
20. Thermal shut-off (cold water failure)
21. Temperature stability of blend water at reduced flow
     rates (for valves designed for multi-outlet
     installations only)
22. Devices to prevent cross tracking inter-
     communications of supply systems
Appendices
A. Method of test for the determination of the rate
     of flow
B. Method of test for the determination of sensitivity
     of temperature control
C. Method of test for the determination of blend
     water temperature stability under changing inlet
     pressure conditions
D. Method of test for the determination of blend water
     temperature stability under changing inlet
     temperature conditions
E. Method of test for determining the thermal shut-off
     of mixing valves when cold water inlet supply fails
F. Method of test for temperature stability of blend
     water at reduced flow rates
G. Method of test for the determination of resistance
     to cross tracking
Tables
1. Minimum flow rate in litres per second
2. Blend water temperature variations (changing inlet
     pressure)
3. Blend water temperature variations (changing
     temperature)
4. Outlet flow under cold water failure
5. Blend water temperature at reduced flow rates
6. Dimensions of pressure take-off tee
Figures
1. Blended water temperature test apparatus
2. Details of pressure take-off tee
3. Thermometer tee arrangement
4. Suggested thermometer housing details

Specifies materials, design, construction and performance requirements with a method of specifying size of thermostatic mixing valves, suitable for use with inlet supply pressures of up to 6 bar and inlet water temperature of between 10°C and 72°C.