BS 5433:1976

Foreword
Cooperating organizations
Specification
Section one. General
1 Scope
2 References
3 Definitions
4 Illustrations
5 Nominal size
6 Marking
Section two. Dimensions, testing and materials
7 Dimensions
8 Testing
9 Materials
Section three. Workmanship
10 Castings
11 Forgings
12 Machining
13 Thickness of parts
Section four. Design and construction
14 Waterway
15 Seat
16 Screw threads
17 Head seal
18 Washer plate
19 Bodies and heads
20 Method of attaching crutch or square head
21 Clearance between crutch and stuffing box
22 Joint washers
23 Seat washers
24 Glands and gland packings
25 Union connections
26 Hexagonal shoulders
Tables
1 Materials
2 Head seal features
3 Dimensions of underground stopvalve bodies
4 Dimensions of heads and glands
5 Dimensions of square heads, crutches, spindles,
    washers and washer plates
6 BS Whitworth threads (external) on spindles for
    engagement with head threads (internal) limits and
    tolerances: free class
7 BS Whitworth threads (internal) on heads for
    engagement with spindle threads (external) limits
    and tolerances: normal class
8 BS Whitworth form screw threads (external) on heads
    for engagement with body threads (internal) limits
    and tolerances: medium class
9 BS Whitworth form screw threads (internal) on bodies
    for engagement with head threads (external) limits
    and tolerances: medium class
10 BS Whitworth form screw threads (external) on glands
    for engagement with stuffing box threads (internal)
    limits and tolerances: medium class
11 BS Whitworth form screw threads (internal) in
    stuffing box for engagement with gland threads
    (external) limits and tolerances: medium class
12 Parallel spigot and cone end tail pipes for
    underground stopvalves
Figures
1 Underground stopvalve
2 Dimensions of underground stopvalve bodies
3 Dimensions of heads and glands
4 Square heads
5 Dimensions of crutches, spindles, washers and washer
    plates
6 Reference diagram for ends, tail pipes and nuts

Copper alloy screwdown stopvalves, nominal sizes ½ to 2.

This British Standard applies to copper alloy screwdown stopvalves of nominal sizes from ½ to 2 for installation on underground water service pipes. The nominal size is that corresponding to the pipe size of the thread at the end connection. It includes stopvalves with ends screwed internally or externally or arranged in accordance with clause 25, and fitted with a crutch or with a square head.