BRITISH STANDARD BS5433:1976
Incorporating
Amendment Nos.1
CONFIRMED and2
DECEMBER 2007
Specification for
Underground
stopvalves for water
services
UDC696.117:621.646.651
BS5433:1976
Cooperating organizations
The Sanitary Appliances Standards Committee, under whose supervision this
British Standard was prepared, consists of representatives from the following
Government departments and scientific and industrial organizations:
British Bath Manufacturers’ Association* Institution of Public Health Engineers
British Plastics Federation* Metal Sink Manufacturers’ Association
Council of British Ceramic Sanitaryware Ministry of Defence
Manufacturers* National Brassfoundry Association*
Department of the Environment* National Federation of Builders’ and
Environmental Health Officers’ Association Plumbers’ Merchants*
Greater London Council* National Water Council*
Institute of Plumbing* Royal Institute of British Architects
Institution of Heating and Ventilating Royal Institute of Public Health and Hygiene
Engineers* Royal Society of Health*
Institution of Municipal Engineers* Water Companies’ Association*
The Government department and scientific and industrial organizations
marked with an asterisk in the above list, together with the following, were
directly represented on the committee entrusted with the preparation of this
British Standard:
Association of Manufacturers of Domestic Heating and Ventilating Contractors’
Electrical Appliances Association
British Gas Corporation Institute of British Foundrymen
British Non-ferrous Metals Technology Institution of Gas Engineers
Centre Institution of Water Engineers and
British Valve Manufacturers’ Association Scientists
Copper Ball Manufacturers’ Association National Association of Plumbing, Heating
Copper Development Association and Mechanical Services Contractors
Copper Tube Fittings Manufacturers’ Society of British Gas Industries
Association South London Consortium
Department of the Environment, Building Thames Water Authority—Metropolitan
Research Establishment Water Division
Department of Prices and Consumer Individual experts
Protection
This British Standard, having
been prepared under the
direction of the Sanitary
Appliances Standards
Committee,was published
underthe authority of the Amendments issued since publication
Executive Board on
30 November1976 Amd. No. Date of issue Comments
(c) BSI 08-1999 3570 December 1981
The following BSI references 4596 September
relate to the work on this 1984 Indicated by ? margin
standard:
Committee reference SEB/2
Draft for comment73/13411DC
ISBN ? BS5433:1976
Contents
Page
Cooperating organizations Inside front cover
Foreword iii
Section 1. General
1 Scope 1
2 References 1
3 Definitions 1
4 Illustrations 1
5 Nominal size 1
6 Marking 1
Section 2. Dimensions, testing and materials
7 Dimensions 1
8 Testing 1
9 Materials 1
Section 3. Workmanship
10 Castings 3
11 Forgings 3
12 Machining 3
13 Thickness of parts 3
Section 4. Design and construction
14 Waterway 3
15 Seat 4
16 Screw threads 4
17 Head seal 4
18 Washer plate 4
19 Bodies and heads 5
20 Method of attaching crutch or square head 5
21 Clearance between crutch and stuffing box 5
22 Joint washers 5
23 Seat washers 5
24 Glands and gland packings 5
25 Union connections 5
26 Hexagonal shoulders 6
Figure ? stopvalve 3
Figure ? underground stopvalve bodies 8
Figure ? heads and glands 10
Figure ? 13
Figure ? crutches, spindles, washers and washer plates 14
Figure ? ends, tail pipes and nuts 18
Table ? br>Table ? atures 5
Table ? underground stopvalve bodies 7
Table ? heads and glands 9
Table ? square heads, crutches, spindles washers and
washerplates 11
Table ? threads (external) on spindles for
engagementwithhead threads (internal) limits and
tolerances: free class 15
Table ? threads (internal) on heads for engagement
withspindle threads (external) limits and tolerances: normal class 15
(c) BSI 08-1999 i
BS5433:1976
Page
Table ? form screw threads (external)
onheads for engagement with body threads (internal)
limitsand tolerances: medium class 15
Table ? form screw threads (internal)
on bodies for engagement with head threads (external)
limits and tolerances: medium class 16
Table 10 — BS Whitworth form screw threads (external)
on glands for engagement with stuffing box threads
(internal) limits and tolerances: medium class 16
Table 11 — BS Whitworth form screw threads (internal)
instuffing box for engagement with gland threads
(external) limitsand tolerances: medium class 16
Table 12 — Parallel spigot and cone end tail pipes for
underground stopvalves 17
Publications referred to Inside back cover
ii (c) BSI 08-1999
BS5433:1976
Foreword
This British Standard has been prepared under the authority of the Sanitary
Appliances Standards Committee. The original idea for ? for
special stopvalves arose from ? then British Waterworks
Association (now National Water Council) who had carried out an investigation
among their members into the use and behaviour of valves based on
BS1010:1959 when used underground. Experience of the exacting conditions and
lack of accessibility in situations where they were installed led to the
recommendation for ? with special design features to match the
operating conditions.
The dimensions given are those considered necessary to ensure the production of
valves of nominal size" to2 suitable for underground water services.
It is recommended that the body of the valve and the metal components be based
on gunmetals and bronzes for strength and that attention be given to resistance
against dezincification.
There is provision for alternative methods of operation by means of either a
crutch-type handle or ? vision is made for minimum opening
torque so as to prevent the possibility of the head screwing out of the body when
the stopvalve is being opened or turned with ? 1959 has been retained and retitled “Part 1: Imperial units”.
Above-ground stopvalves are now included in the metric version BS1010-2:1973.
In this standard, dimensions are expressed in metric terms except that pipe
thread designations accord with BS2779.
Requirements for methods of testing suitability of materials for use in contact
with water for domestic purposes will form the subject of ? rd to
be prepared under the direction of the Environment and Pollution Standards
Committee (EPC/-).
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with ? does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises ? inside front cover, pagesi to iv,
pages1 to18, an inside back cover and ? This standard has been updated (see copyright date) and may have had
amendments incorporated. This will be indicated in the amendment table on the
inside front cover.
(c) BSI 08-1999 iii
iv blank
BS5433:1976
Section 1. General d) direction of flow.
1 Scope Section 2. Dimensions, testing and
This British Standard applies to copper alloy materials
screwdown stopvalves of nominal sizes from" to2
for installation on underground water service pipes. ? he nominal size is that corresponding to the pipe Dimensions for screw threads shall comply with
size of the thread at the end connection. It includes those specified in Table ? her
stopvalves with ends screwed internally or dimensions for valve bodies and components shall
externally or arranged in accordance with clause25, be as specified in Table 3, Table ? >and fitted with ? imensions for parallel spigot and cone end tail
pipes shall be as specified in Table 12.
2 References
The titles of the publications referred to in this ? dard are listed on the inside back cover. Every stopvalve shall be tested in the assembled
condition both in the fully closed position (seat test)
3 Definition and in the fully open position (body test).
For the purpose of this British Standard the In both cases the test shall consist of either a
1)
following definition applies, together with any hydraulic test at not less than21bar or a
which are relevant in BS2591-1. pneumatic test at not less than5bar while the
stopvalve is completely immersed in water.
screwdown stopvalves
Alternatively, the body test may be carried out with
any valve in which ? valve reversed and in the closed position. The
non-metallic washer is lifted from and lowered onto valve being tested shall neither leak nor sweat
the body seat by ? xis is during tests.
perpendicular to the face of the body seat and
having suitable means of connection for insertion in ? pipeline. The use of the word valve or stopvalve
9.1 Composition. The preferred metallic materials
herein shall be taken to mean an underground
for the component parts of underground stopvalves
stopvalve
are those listed in Table 1.
4 Illustrations 9.2 Alternative materials. Other metallic
materials may be used provided that they are not
Illustrations of typical stopvalves showing the less suitable than those listed in Table 1, not more
component parts are given in Figure ? sceptible to corrosion, completely immune to
These illustrations are not intended to indicate dezincification and are not of lower mechanical
design. strength.
5 Nominal size 9.3 Materials in contact with supply water. The
materials which are in contact with supply water,
Stopvalves shall be designated by their nominal including “O”-rings, gland packings, seat washers
sizes; their dimensions shall be as specified in and lubricants used in the construction, shall not
Table ? nstitute ? shall not foster
microbiological growth or give rise to taste, odour,
6 Marking cloudiness or discoloration of the water. Attention is
Stopvalves shall be legibly and permanently drawn to National Water Council requirements in
marked with the following information. this respect.
On the headwork and body:
a) manufacturer’s name or mark;
b) the number of this British Standard,
i.e.BS5433.
On the body:
c) nominal size;
1) 1bar= 105 N/m2 =100kPa.
(c) BSI 08-1999 1
BS5433:1976
Table ? >1 ? sic material form Sand castings Non-forging stock Forging
stock
3 Material specification
et
z
2 4
sn
0 0
a
1 ? r>l ? br>r
r
G ? r>a ? s
b
e
t ? br>h
z
u
e ? component parts r
r
e
P C
0 ?
m
n
g
0 ? >u u
2 ? br>n ? br>n
n
5 ? ui
t
2 2
C
S ? r>G ? br>B ? r>u
B B
l
C
B
A
4 Body ? nd nominal size" and#
only ? size1 and over ? le nominal size" and#
only ? al size1 and over ? utch ? sher plate ? re head ? ion nuts, compression nuts and
tail pipes ? ing washer Vulcanized synthetic rubber complying with the
requirements of clause6 of BS3457:1973
16 Head seal “O”-ring Rubber complying with the requirements of BS2494
17 Gland packing See clause24
18 Pinning wire for square head BS2874, CZ121 or CZ122
2 (c) BSI 08-1999
BS5433:1976
Figure ? stopvalve
Section 3. Workmanship 13 Thickness of parts
Except where there are definite dimensions given
10 Castings which provide for ? s, no part of any
Castings shall be in all respects sound and good, free component of ? of less thickness than
from laps, blow holes and pitting, and both the that shown in Table 3, line4. Minimum thicknesses
external and internal surfaces shall be clean, for unions are given in Table 12; see also clause25.
smooth and free from sand.
They shall be neatly dressed and no casting shall be Section 4. Design and construction
burned, plugged, stopped or patched.
14 Waterway
11 Forgings Except where otherwise stated, the area of
All forged components shall be sound, solid without waterway throughout the body of ? br>laminations, smooth and well finished and shall not less than the area of ? ter equal to
comply with the requirements of BS3885. the bore of the seating.
The dimensions of the waterway through the unions
12 Machining of ? not less than those stated in
Table 12 for the purposes specified in the table, or
The bodies, heads, spindles and other parts shall be
alternatively if the union ends are for copper tube
truly machined so that, when assembled, the parts
are axial and parallel with surfaces smoothly the dimensions shall be not less than is specified for
finished with the limits of the size given in the the appropriate size of union in BS864-2.
tables applicable to the various components.
(c) BSI 08-1999 3
BS5433:1976
15 Seat 16.4 Head thread. The spindle thread in the head
(internal) shall be so formed that when the spindle
The seat of ? flat and solid with the
is screwed into the head to its fully open position,
body and shall fully support the washer. The bore of
the end of the spindle projects beyond the face of the
the seat shall be rounded to ? ess
head at least0.8mm in nominal sizes up to1 and at
than0.5mm and not more than0.8mm. least1.6mm in larger sizes so that the top of the
The minimum thickness of metal supporting the washer plate shall be clear of the bottom of the head
seat shall be as given in Table 3, line3. when the valve is fully open. ?
formed at the top of the thread equal in depth to the
16 Screw threads depth of thread and in length not greater than the
16.1 General. Unless otherwise specified, all dimensions given in Table 4, line5.
threads shall be of Whitworth or metric form and
right-handed. 17 Head seal
The external thread on spindles and the The head seal shall be as shown in Figure 1,
corresponding internal thread in heads shall be as i.e.using toroidal sealing rings and chamfer-type
detailed in Table ? al, and shall comply with the following
All special threads on component parts shall be requirements.
made to the diameters and pitches specified in a) The housing dimensions and “O”-rings shall
Table ? this standard and shall comply with the requirements of BS4518 or
comply with the requirements of BS84 so far as it is BS1806 and the “O”-ring sections diameters
applicable. shall be as specified in Table 2. The “O”-ring shall
16.2 Inlet and outlet. Except where otherwise be ? fit on the head in order that it
specified in this standard, inlets and outlets of will not fall off during assembly of the head in the
valves shall: body. The rubber shall comply with the
requirements of BS2494. The minimum width of
a) for ? the same nominal size as metal to metal contact between body and head
the valve, either: flanges shall be as specified in Table 3, line7.
1) comply with the requirements of class ? erence number of suitable
Table 3M or Table ? for standard rings.
external threads; or b) The head seal shall withstand ? omply with the requirements of Table 4M breaking torque applied to the head as indicated
or Table ? for internal in Table ? movement between
threads; head and body.
or c) ? the head shall be formed at
b) for union ends, comply with the dimensions the back of the body attachment thread below the
specified in Table 12; flange, the length of which shall be not less than
the depth of the “O”-ring seal chamfer in the
or body, neither shall it prevent the body flange and
c) either: head flange engagement complying with the
1) be tapped or screwed (taper pipe thread) to requirements of b).
comply with the requirements of BS21; or
2) be tapped or screwed to comply with the 18 Washer plate
requirements of BS61; or The washer plate with its stem shall be made in one
3) comply with the requirements of clause25. piece, true all over, especially on the face on which
16.3 Spindle thread. The length of the spindle the washer will be seated. If the washer plate is a
thread shall be such that, when the washer plate is casting it shall be machined all over.
resting on the seating without any washer, ? er plate shall be free to rotate and so
of the thread equal to not less than70% of the secured as to lift with the spindle.
external diameter of the threaded portion of the Washer plates shall have ? tachment
spindle shall be in full engagement with the internal of the washer. The stud shall be screwed and
thread of the head. provided with ? ith the
requirements of BS57 or of BS1083. The length of
the screwing on the stud shall ensure that the
washout beyond the thread is always shorter than
the minimum thickness of the washer Q
(see Table ? br>4 (c) BSI 08-1999
BS5433:1976
Table ? atures
“O”-ring and housing references
Valve size, Minimum
BS4518 (metric) BS1806 (imperial) breaking torque
nominal after assembly
Section diameter “O”-ring ref. no. Section diametera “O”-ring ref. no.
mm in Nm
" 2.4 — 0.103 119 40
# 2.4 — 0.103 123 40
1 2.4 0396-24 0.103 129 40
1! 3.0 — 0.139 225 55
1" 3.0 0545-30 0.139 227 55
2 3.0 0695-30 0.139 — 55
a
0.103 in "e 2.62 mm. 0.139 in "e 3.53 mm.
An undercut used for securing the washer plate No crutch or square head shall be screwed onto the
(tolift with the spindle) shall have ? spindle.
less than80% of the minimum diameter of the The external dimensions of the square head shall be
washer plate stem given in Table 5, line12. as shown in Table 5, lines21,22 and23.
19 Bodies and heads 21 Clearance between crutch and
19.1 Minimum thickness of wall. The minimum stuffing box
thickness of wall left after threading for any When the valve is closed, there shall be sufficient
screwed parts of ? wise specified distance between the top of the stuffing box and the
shall be not less than the thicknesses given in underside of the crutch or square head in order that
Table 3, line4. the valve can be repacked without removing either
19.2 Thickness of screwed ends. Except where the crutch or square head.
the dimensions specified provide otherwise, the
thickness of metal between the minor diameter of 22 Joint washers
the thread and the bore of externally screwed ends
shall be within the limits given in Table 3, line9, Joint washers for use on parallel spigot tail pipes
shall be made of materials complying with the
and the thickness of metal on hexagon ends between
requirements of clauses6 or7 and Appendix ? diameter of the internal thread and the
BS3457:1973.
faces of the hexagon shall be not less than those
given in Table 3, line 4. 23 Seat washers
20 Method of attaching crutch or All seat washers shall be of vulcanized synthetic
square head rubber complying with the requirements of clause6
of BS3457:1973.
Normally, ? head shall be fitted on
a square spindle; the area of the inscribed square for 24 Glands and gland packings
any diameter of spindle is the smallest area
permissible for insertion in the crutch or square Glands are illustrated in Figure ?
head. The crutch or square head may be fitted by the detailed in Table 4. The packing shall be of
use of any other not less suitable device provided lubricated graphited asbestos or other equally
that the minimum area of spindle allowed and the efficient material. If the packing is not in grommet
necessary mechanical strength are preserved in the form, ? tallic washer shall be fitted
design. All crutches and square heads shall be ? the gland or stuffing box.
close fit on the spindle without shake.
Crutches shall be fixed to the spindle by riveting, ? tions
screw or other equally efficient device. Any tail pipe and coupling nut fitted to ? Square heads shall be fixed by ? as detailed in Table 12, and shall be in
(see Figure 4, type1) fastening onto or through the accordance with the dimensions and tolerances set
round portion of the spindle, but not the square, or out in Table 12 for parallel spigot and cone end
may be fixed by riveting, ? efficient unions respectively.
device (see Figure 4, type2).
(c) BSI 08-1999 5
BS5433:1976
Unions of the cone type shall have the cone end When the end of ? quired for
machined or ground to ? without the connecting to polyethylene pipe complying with the
use of grommets, washers, plastics material or other requirements of BS1972 and BS3284, the
jointing. minimum thicknesses as specified in BS864-3 shall
When the end of ? ed to be suitable for be adhered to.
connecting to copper tube, that part of the end which
forms the copper tube connection shall comply with 26 Hexagonal shoulders
the requirements of BS864-2, type B. No An hexagonal shoulder or other equally effective
departures from the requirements of this standard configuration shall be provided on at least one end
shall be made other than those essential to ensure of each stopvalve screwed with ? ess
compliance with the requirements BS864-2, type ? ion or compression joints.
or capillary union only.
Hexagonal shoulders or other equally effective
configuration shall be provided on the heads of all
stopvalves.
6 (c) BSI 08-1999
BS5433:1976
Table ? underground stopvalve bodies (see Figure 2)
All dimensions are in millimetres unless otherwise stated.
1 ? 13 14 15
Line Ref. Nominal size of stopvalve
no. on
figure Dimension " ? br>max. min. max. min. max. min. max. min. max. min. max. min.
1 ? 13.0 12.5 19.3 18.9 25.8 25.2 32.3 31.5 38.6 37.8 51.3 50.4
2 ? t
21.9 28.6 37.6 44.4 51.9 68.6
spot face
3 ? >metal supporting 3.6 3.6 4.8 5.9 5.9 7.1
seat
4 ? >walls not 2.4 2.4 3.2 4.0 4.0 4.8
threaded, etc.
5 ? br>of body thread (in 0.9531 1.2187 1.5937 1.8594 2.1562 2.8125
inches)
6 ? ternal thread
and chamfer on 12.5 13.5 16.5 18.5 20.5 23.5
body
7 ? br>contact between 2.4 2.4 3.2 4.0 4.0 4.8
body and head
8 ? 4.0 4.0 5.0 5.0 5.0 6.0
thickness
9 ? ll
ends (minor 3.4 2.6 3.6 2.6 3.8 3.1 4.8 3.9 4.8 3.9 5.6 4.7
diameter to bore)
10 ? ternal thread 12.0 15.0 19.0 22.0 22.0 25.0
(parallel)
11 ? ternal thread 15.0 19.0 22.0 25.0 25.0 28.0
(parallel)
12 ? .2 3.6 4.0 4.0 4.7 4.7
thickness
13 ?
9.0 10.0 11.0 12.0 14.0 16.0
hexagon
14 ?
29.0 36.0 46.0 57.0 65.0 82.0
flange
(c) BSI 08-1999 7
BS5433:1976
Figure ? underground stopvalve bodies (see Table 3)
8 (c) BSI 08-1999
BS 5433:1976
15
min.
4.7
1.25 6.0
1.625 5.0
24.0
22.0 44.0
23.0 19.0 53.9
19.0
14
max.
2.8125
1.645
2 24.46
15.0
13
min.
4.0
1.125 5.0
1.4375 5.0
19.0 42.0 20.8
20.0 15.0 44.4
17.0
12
max.
2.1562
1.4375
"
1 12.0 21.21
11
min.
4.0
1.00 5.0
1.250 4.0
17.0 35.0
17.0 17.63 13.0 39.6
14.0
10
max.
1.8594
1.250
!
10.017.98min.
3.1
0.875 5.0
1.0625 4.0
(see Figure 3) (see Figure
15.0 31.0
11.0 33.3
15.0 16.02
13.0
Nominal size of stopvalvemax.
1.5937
8.0
1.062516.36min.
2.7
0.75 4.0
0.750 3.0
12.0 26.0
11.0 28.0
12.0 12.82
10.0max.
1.2187
7.0
0.750
#
13.11min.
2.3
0.625 4.0
0.6875 9.0 3.0
9.0
11.0 21.0
22.2
11.0 11.22— Dimensions of heads and glands of heads — Dimensions
max.
0.9531
7.0
0.6875
"
11.51
Table 4)
P
Major diameter of external thread on Major diameter of external head (in inches) Axial length of collar
Thickness of head flange
Length of external thread, including Length of external thread, seal plain portion for head thread for Major diameter of internal spindle (in inches) for spindle Length of internal thread Axial length of recess
Dimension
Axial length of hexagon Size of hexagon across flats Major diameter of external thread on gland (in inches) Thickness of gland flange
Major diameter of internal thread for stuffing box (in inches) Axial length of stuffing box (minimum length of thread= Diameter of hole for spindle
Length of external thread on gland and internal thread in stuffing boxon
Ref.
figure
A J
K
B ? >2 ? Line
10
11 12 13 14
15
All dimensions are in millimetres unless otherwise stated. are in millimetres All dimensions
(c) BSI 08-1999 9
BS5433:1976
Figure ? heads and glands [see Table ? ]
10 (c) BSI 08-1999
BS 5433:1976
7.0 6.0
15
12.44 63.0 35.0
85.0 44.0 46.0 38.1 13.21 23.60
12.7
32.0 16.6
min.
127.0
14
in. BSF6.4
max.
/63.6
12.7 38.0
1.250
40.7 13.97 23.808.46
8.96
13
6.0
47.0 6.0
27.0
75.0 38.0 44.0 30.5 20.44
11.1
29.0 14.6
min.
114.0
12
in. BSF
max.
16
6.4
8.71
1.125
9.48
"47.6 5
30.0
33.0 20.62(see Figure ? ee Figure
11
min.
5.0
6.0
7.67
8.18
9.5
40.0
24.0
64.0 33.0 36.0 27.1 17.27
95.0 25.0 12.3
in. BSF
10
16
5.4
7.93
8.69
max.
!
/40.5
27.0
29.5 17.45 1.00
15.0
5.0
7.08
7.34
7.9
min.
33.0
20.0
31.0 33.0 22.8 15.7
59.0
82.0 22.0
11.1
Nominal size of stopvalvemax.
5.4
7.29
7.55 0.8750
O BA
33.4
22.0
24.4 15.88
14.0
5.0
6.30
6.53
8.7 6.3
min.
25.0
16.0
25.0 27.0 18.8 12.55
46.0
66.0 18.0max.
4.4
6.48
0.7482
6.73
O BA
25.4
18.0
20.4 12.7
#4.0
4.0
5.51
5.74
7.9 6.3
min.
18.3
15.0
22.0 22.0 17.2 10.95
40.0
60.0 16.0
cmax.
4.4
5.69
0.6233
5.94
2 BA
18.7 17.0
11.1
18.8
"
b
auntil December 1985.
9.2
.
18
Thickness of washer (when new) Size of stud and nut
Outside diameter of washer Length of washer plate stem Thickness of washer plate
Diameter of washer plate stem
Diameter of plain portion of spindle Major diameter spindle thread (in inches)
Distance when closed, underside crutch Distance when closed, to top of head Length of extended thread on spindle Depth of washer plate stem hole in spindle Diameter of washer plate stem hole in spindle
Length under crutch of spindle Length under crutch
Length of crutch Bar stock size for crutches end of spindle Size across flats square of spindle Length of square end
Dimension
Table ? square heads, crutches, spindles, washers and washer plates and washer plates washers crutches, spindles, of square heads, — Dimensions Table 5on
Ref.
Q R
N ? r>F ? ? dimensions given in this line are boss sizes, which may be reduced by up to0.4mm in polishing and finishing. The dimensions given in this line are boss See also clause
It is permissible to use
no.
a ? 14 15
12
10 11
All dimensions are in millimetres unless otherwise marked. are in millimetres All dimensions
Line
(c) BSI 08-1999 11
BS 5433:1976
15
min.
9.5
3.0
32.0
67.3
63.8
14
max.
10.0
3.2
67.8 25.4 28.6
64.313
min.
8.0
3.0
32.0
51.0
47.8
12
max.
8.5
3.2
"
25.4 28.6
51.5
48.3(see Figure ? nd Figure Figure ? in.
8.0
2.5
32.0
43.3
40.6
10
max.
8.5
2.7
!
25.4
28.6
43.6
41.0
1min.
6.0
2.5
19.0
36.1
33.5
Nominal size of stopvalve size of Nominalmax.
6.4
2.7
15.8
19.0
36.4
33.8
1min.
6.0
2.0
19.0
28.0
25.5max.
6.4
2.2
15.8
19.0
28.3
25.8
#min.
4.7
2.0
19.0
20.9
18.8max.
5.0
2.2
15.8
19.0
21.2
19.1
"Size across flats of iron Size across flats of iron square head (top)
Length of taper of iron Length of taper of iron square head Size across flats of iron square head (bottom) Diameter of hole in washer
Outside diameter of washer plate
Inside diameter of Inside diameter washer plate
Depth of counter bore Depth of counter
Dimension
Table ? square heads, crutches, spindles, washers and washer plates washer and washers spindles, crutches, heads, of square ? ableon
Ref.
W
V ? S
figureno.
Line
22
21 23 24
20
19
18
12 (c) BSI 08-1999
BS5433:1976
Figure ? (see Table 5)
(c) BSI 08-1999 13
BS5433:1976
Figure ? crutches, spindles, washers and washer plates (see Table 5)
14 (c) BSI 08-1999
BS5433:1976
Table ? threads (external) on spindles for engagement with
headthreads(internal)
Limits and tolerances: free class
1 ? 2
Line Nominal Number Major diameter Effective diameter Minor diameter
no. size of of
valve threads max. tolerance min. max. tolerance min. max. tolerance min.
per inch
in. in. in. in. in. in. in. in. in
1 " 11 0.6233 0.0114 0.6119 0.5651 0.0084 0.5567 0.5069 0.0144 0.4925
2 ? 0.7360 0.6842 0.0090 0.6752 0.6202 0.0153 0.6049
3 ? 0.8621 0.8039 0.0096 0.7943 0.7328 0.0163 0.7165
4 1! ? .9863 0.9200 0.0102 0.9098 0.8400 0.0173 0.8227
5 1" ? .1105 1.0335 0.0107 1.0228 0.9420 0.0183 0.9237
6 ? 1.2351 1.1585 0.0111 1.1474 1.0670 0.0187 1.0483
NOTEThe sizes given above are BS Whitworth “bolt” sizes (see Table ? the limits and tolerances for the various
sizes correspond to those given in Table ? r>Table ? threads (internal) on heads for engagement with
spindlethreads(external)
Limits and tolerances: normal class
1 ? ine Nominal Number of Major Effective diameter Minor diameter
no. size of threads per diameter
valve inch (min.) max. tolerance min. max. tolerance min.
in. in. in. in. in. in. in.
1 " 11 0.6250 0.5752 0.0084 0.5668 0.5338 0.0252 0.5086
2 ? 0.0090 0.6860 0.6490 0.0270 0.6220
3 ? 0.0096 0.8039 0.7620 0.0292 0.7328
4 1! ? .0102 0.9200 0.8720 0.0320 0.8400
5 1" ? .0107 1.0335 0.9776 0.0356 0.9420
6 ? 0.0111 1.1585 1.1026 0.0356 1.0670
NOTEThe sizes given above areBS Whitworth “nut” sizes, (see Table ? the limits and tolerances for the various
sizes correspond to those given in Table ? r>Table ? form screw threads (external) on heads for engagement
withbodythreads (internal)
Limits and tolerances: medium class
1 ? 2
Line Nominal Number Major diameter Effective diameter Minor diameter
no. size of of
valve threads max. tolerance min. max. tolerance min. max. tolerance min.
per inch
in. in. in. in. in. in. in. in. in.
1 " 18 0.9531 0.0081 0.9450 0.9175 0.0056 0.9119 0.8819 0.0106 0.8713
2 ? 1.2106 1.1831 0.0056 1.1775 1.1475 0.0106 1.1369
3 ? 1.5842 1.5480 0.0066 1.5414 1.5023 0.0124 1.4899
4 1! 14 1.8594 0.0095 1.8499 1.8137 0.0066 1.8071 1.7680 0.0124 1.7556
5 1" 14 2.1562 0.0099 2.1463 2.1105 0.0070 2.1035 2.0648 0.0128 2.0520
6 ? 2.8026 2.7668 0.0070 2.7598 2.7211 0.0128 2.7083
NOTEThe tolerances given above are based on values given in BS84:1956.
(c) BSI 08-1999 15
BS5433:1976
Table ? form screw threads (internal) on bodies for engagement
withheadthreads (external)
Limits and tolerances: medium class
1 ? ine Nominal Number Major Effective diameter Minor diameter
no. size of of threads diameter
valve per inch (min.) max. tolerance min. max. tolerance min.
in. in. in. in. in. in. in.
1 " 18 0.9531 0.9231 0.0056 0.9175 0.9014 0.0195 0.8819
2 ? 0.0056 1.1831 1.1670 0.0195 1.1475
3 ? 0.0066 1.5480 1.5260 0.0237 1.5023
4 1" 14 1.8594 1.8203 0.0066 1.8137 1.7917 0.0237 1.7680
5 1" 14 2.1562 2.1175 0.0070 2.1105 2.0885 0.0237 2.0648
6 ? 0.0070 2.7668 2.7448 0.0237 2.7211
NOTEThe tolerances given above are based on values given in BS84:1956.
Table 10 — BS Whitworth form screw threads (external) on glands for engagement with stuffing
box threads (internal)
Limits and tolerances: medium class
1 ? 2
Line no. Nominal Number Major diameter Effective diameter Minor diameter
size of of
valve threads max. tolerance min. max. tolerance min. max. tolerance min.
per inch
in. in. in. in. in. in. in. in. in.
1 " 18 0.6875 0.0078 0.6797 0.6519 0.0053 0.6466 0.6163 0.0103 0.606
2 ? 0.7422 0.7144 0.0053 0.7091 0.6788 0.0103 0.668
3 ? 1.0544 1.0269 0.0056 1.0213 0.9913 0.0106 0.980
4 1! 14 1.2500 0.0091 1.2409 1.2043 0.0062 1.1981 1.1586 0.0120 1.146
5 1" 14 1.4375 0.0095 1.4280 1.3918 0.0066 1.3852 1.3461 0.0124 1.333
6 ? 1.6155 1.5793 0.0066 1.5727 1.5336 0.0124 1.521
NOTEThe tolerances given above are based on values given in BS84:1956.
Table 11 — Whitworth form screw threads (internal) in stuffing box for engagement
withglandthreads (external)
Limits and tolerances: medium class
1 ? ine no. Nominal Number of Major Effective diameter Minor diameter
size of threads per diameter
valve inch (min.) max. tolerance min. max. tolerance min.
in. in. in. in. in. in. in.
1 " 18 0.6875 0.6572 0.0053 0.6519 0.6358 0.0195 0.6163
2 ? 0.0053 0.7144 0.6983 0.0195 0.6788
3 ? 0.0056 1.0269 1.0108 0.0195 0.9913
4 1! 14 1.2500 1.2105 0.0062 1.2043 1.1823 0.0237 1.1586
5 1" 14 1.4375 1.3984 0.0066 1.3918 1.3698 0.0237 1.3461
6 ? 0.0066 1.5793 1.5573 0.0237 1.5336
NOTEThe tolerances given above are based on values given in BS84:1956.
16 (c) BSI 08-1999
BS5433:1976
Table 12 — Parallel spigot and cone end tail pipes for underground
stopvalves (see Figure 6)
All dimensions are in millimetres unless otherwise stated.
1 ? 13 14 15
Size of screwing for body and ? G2"
nut, pipe thread to BS2779
Nominal size of underground
stopvalve " ? br>Line Ref. Dimension max. min. max. min. max. min. max. min. max. min. max. min.
no. Parallel spigot tail
pipesa
b
1 Aa Parallel spigot
diameter 17.50 22.20 29.40 37.30 44.50 54.00
2 Ab Parallel bore for spigot
in end of valve,
diameter 17.90 17.60 22.60 22.30 30.00 29.50 37.90 37.40 45.00 44.50 54.60 54.10
3 Ac Parallel spigot axial
length 6.40 4.70 6.40 4.70 8.00 6.30 9.60 7.90 9.60 7.90 9.60 7.90
4 Ad Parallel bore in end of
valve, axial length 7.20 6.40 7.20 6.40 8.80 8.00 10.40 9.60 10.40 9.60 10.40 9.60
5 Ba Collar diameter 24.00 23.50 30.10 29.30 38.80 37.80 44.70 43.50 56.50 55.30 72.00 70.80
6 Bb Collar axial length 2.40 3.00 3.30 3.80 4.0 4.30
c
7 Ca Outside diameter of
pipe and shoulder 20.40 17.50 25.90 23.90 33.50 31.80 40.20 39.70 50.20 46.10 65.30 60.40
8 Cb Length of optional
shoulder 3.90 3.90 4.70 5.50 5.50 5.80
9 Da Pipe bore 12.70 19.10 25.40 31.70 38.10 50.80
10 Db Pipe length from under
collar to end 53.00 57.00 60.00 63.00 69.00 73.00
11 Ea Thickness of wall 2.40 2.40 3.20 4.00 4.00 4.80
Cone end tail pipes
9° taper
18° included angle
12 Fa Cone large end
diameter 20.40 25.90 33.50 40.20 50.20 65.30
13 Fb Cone axial length 7.90 7.90 9.50 9.50 12.70 12.70
14 Fc Cone (cap) face of collar
to face of internal end 3.20 3.20 4.00 4.00 4.80 4.80
15 Fd Conical bore diameter
of mouth in end of
valve 19.30 24.80 32.20 38.90 48.70 63.80
Coupling nuts
16 Ga Coupling nut, bore 21.00 20.70 26.80 26.40 34.70 34.20 41.40 40.90 51.60 51.10 66.80 66.30
17 Gb Coupling nut, flange
thickness 3.10 3.40 3.90 4.70 4.70 5.00
18 Gc Coupling nut axial
length 16.60 17.40 22.20 23.80 23.80 25.40
19 Gd Coupling nut, size of
flats on hexagon 30.50 37.30 47.00 53.80 66.70 82.20
20 Ha Length of thread on
end of valve 9.50 9.50 12.70 12.70 12.70 12.70
21 Variation on thickness
of pipe due to
eccentricity 0.25 0.30 0.40 0.50 0.50 0.50
a For materials for parallel spigot tail pipe joint washers see clause22.
b When so desired, in order to provide ? her, the minimum wall thickness of the spigot may be1.50mm.
c The large tolerance on the outside diameter of the pipe may be used to form ? ferred.
(c) BSI 08-1999 17
BS5433:1976
Figure ? ends, tail pipes and nuts (see Table 12)
18 (c) BSI 08-1999
BS5433:1976
Publications referred to
BS21, Pipe threads for tubes and fittings where pressure-tight joints are made on the threads.
BS57, B.A. screws, bolts and nuts.
BS61, Threads for light gauge copper tubes and fittings.
BS84, Parallel screw threads of Whitworth form.
BS864, Capillary and compression tube fittings of copper and copper alloy.
BS864-2, Metric units.
BS864-3, Compression fittings for polyethylene pipes.
BS1010, Draw-off taps and stopvalves for water services (screwdown pattern).
BS1010-1, Imperial units.
BS1010-2, Draw-off taps and above-ground stopvalves.
BS1083, Precision hexagon bolts, screws and nuts (B.S.W. and B.S.F. threads).
BS1400, Copper alloy ingots and copper and copper alloy castings.
BS1452, Grey iron castings.
BS1806, Dimensions of toroidal sealing rings (“O” seals and their housings).
BS1972, Polythene pipe (Type32) for cold water services.
BS2494, Materials for elastomeric joint rings for pipework and pipelines.
BS2494-1, Rubber joint rings for gas mains and water mains.
BS2591, Glossary for valves and valve parts (for fluids).
BS2591-1, Screw-down stop, check and gate valves.
BS2779, Pipe threads where pressure-tight joints are not made on the threads.
BS2872, Copper and copper alloys. Forging stock and forgings.
BS2874, Copper and copper alloys. Rods and sections (other than forging stock).
BS3284, Polythene pipe (Type50) for cold water services.
BS3457, Materials for water tap and stopvalve seat washers.
BS3885, Tolerances for hot brass stampings.
BS4518, Metric dimensions of toroidal sealing rings (“O”-rings and their housings).
(c) BSI 08-1999
BS5433:1976
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