BS 6283-1:1991

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 test
D Back pressure test
E Opening and reseating pressure test
F Endurance test
Tables
1 Nominal size of valve
2 Maximum value of dimension X shown in figure 1
3 Torque
Figures
1 Typical arrangement of expansion valve
2 Test arrangement for opening and reseating
     pressures

Design, construction and testing of expansion valves of the automatic reseating type, specifically intended for preventing over-pressurization due to expansion of water in storage water heaters of the unvented type. Does not give recommendations on application or installation of the valves.