BS 6283-3:1991

Committees responsible
Foreword
Specification
Section 1. General
1.1 Scope
1.2 Definitions
1.3 Nominal size
1.4 Marking
Section 2. Materials
2.1 General
2.2 Bodies and associated parts
2.3 Sealing and diaphragm materials
2.4 Spring materials
Section 3. Design and construction
3.1 General
3.2 End connections and flow dimensions
3.3 Valve seat attachment
3.4 Guides and moving parts
3.5 Provision for deposits and drainage
3.6 Adjustment
3.7 Springs
3.8 Easing gear
Section 4. Performance
4.1 Production tests
4.2 Type tests
Appendices
A Information to be supplied by the purchaser
B Production tests
C Torque tests
D Back pressure test
E Opening and reseating temperature test
F Opening and reseating pressure test
G Discharge capacity test
H Water discharge test
J Endurance test
Tables
1 Nominal size of valve
2 Minimum dimensions of flow passages
3 Maximum value of dimension X as shown in figure 1
4 Torque
Figures
1 Typical arrangement of combined temperature and
     pressure relief valves
2 Test arrangement for opening and reseating
     temperatures and pressures
3 Test arrangement for discharge capacity

Design, construction and testing of combined temperature and pressure relief valves of the automatic reseating type, specifically intended for use with and protection of storage water heaters of the unvented type. Does not give recommendations on application or installation of the valves.