BS 5157:1989

Foreword
Committees responsible
Section one. General
1.1 Scope
1.2 Definitions
1.3 Valve patterns
1.4 Size ranges
1.5 Nominal pressure (PN) and Class designation
1.6 Pressure/temperature ratings
Section two. Body ends
2.1 Flanged body ends
2.2 Butt-weld body ends
Section three. Design
3.1 Bodies
3.2 By-pass
3.3 Body to bonnet connection
3.4 Stems
3.5 Operation
3.6 Bolting
3.7 Seats
3.8 Disks
3.9 Stem glands
3.10 End connections
Section four. Materials
4.1 Pressure containing shell
4.2 Disks and body seats
4.3 Facings for disk, body seat and body
4.4 Stems
4.5 Stem glands, body seals and gaskets
4.6 Bolting
4.7 Handwheel
Section five. Testing
5.1 Production pressure testing
5.2 Test certificate
5.3 Manufacturer's certificate
Section six. Marking
6.1 General
6.2 Body markings
6.3 Identification plate markings
6.4 Material symbols
6.5 Omission of markings
Section seven. Preparation for storage and transportation
7.1 General
7.2 Body ends
7.3 Disk position
Appendices
A. Information to be supplied by purchaser
B. Weld-end preparations
C. Approximate diameters of body end ports
D. Typical steel gate (parallel slide) valves
Tables
1. Pressure/temperature ratings for Special Class butt-
    weld end valves: material carbon steel
2. Pressure/temperature ratings for Special Class butt-
    weld end valves: material carbon molybdenum steel
3. Pressure/temperature ratings for Special Class butt-
    weld end valves: material 1% chromium 1/2% molybdenum
    steel and 1 1/4% chromium 1/2% molybdenum steel
4. Pressure/temperature ratings for Special Class butt-
    weld end valves: material 2 1/4 % chromium 1 %
    molybdenum steel
5. Face-to-face dimensions and tolerances for flanged
    end valves with raised faces
6. End-to-end dimensions and tolerances for valves
    with body ends flanged to BS 1560: Section 3.1 having
    ring-joint faces
7. End-to-end dimensions and tolerances for but-weld
    end valves
8. Drain tapping sizes
9. Materials for body, bonnet and stuffing box
10. Test durations
11. Trim material identification symbols
12. Weld-end preparation
13. Approximate diameters of body end ports
Figures
1. Weld-end preparation
2. Venturi pattern with eyelet
3. Full bore pattern without eyelet
4. Pressure seal and bolted bonnet assemblies

Carbon and alloy steel valves having hard metal, nickel alloy or stainless steel facings. PN 16, PN 25 and PN 40 valves having flanged ends and Class 150, 300 and 600 valves with butt-weld ends and flanged ends in the ranges of nominal sizes DN 40 to DN 600 and 1½ to 24 inclusive.