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165 views27 pagesBS 5352
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/ 27
BST BS*5352 61 MH LL24L69 018959) 8 mm
i BS 5352: 1981
Dc 621,040.03:605.6.025
J CONFIRMED NOVEMBER 1983
Specification for
Steel wedge gate, globe and check valves
50 mm and smaller for the petroleum,
petrochemical and allied industries
Spécification pour les vannes a coin, sphériques et de retenue en acier de 50 mm
ou moins pour les industries du pétrole, pétrochimiques et industries associées
Spezifikation fr Stahlkeil-Absperr-, Durchgangs- und Regulierventile 50 mm und
kleiner, fiir die Erdél-, Erdéichemie- und verwandte Industrien
British Standards Institution
wi
bythe Bish Slondords nttton
hi 19 1548:59 7005 BS 5352: 1981
Contents
Page
Foreword 1
Cooperating organizations Back cover
Specification
Sei
none. General
Scope
References
Definition
Pressure classification
Pressure/temperature ratings
Nominal sizes
End types
Information to be supplied by the purchaser
Section two. Design
9. Sheil
10. Backseat face
11, Bolting
12. Direction of flow
13. Nameplate
14. Wedge
16, Dick and disk nut
16. Stem
17, Stutfing box
18. Yoke, yake sleeve and yoke bush
19. Body seat and body seat ring
20. Handwheel
21, Rallaws seal
22. Check valves
Section three, Materials
23, Shell
24. Body seat ring
26. Body and bonnet/cover gasket
28. Wedge, disk, piston or ball
27. Yoke
28. Handwheel
29. Handwheel and yoke bush/sleeve retaining nut
30. Yoke bush or sleeve
31. Gland
32. Bollows
33. Trim
34. Stom packing
35, Bolting 10
36. Nameplate 10
87. Special applications 10
Section four. Marking
38. General 10
39. Body markings 10
40. Identification plate marking 10
41. Adgitional markings 10
42. Omission of markings 10
Copah by the rsh Stndords Istuon
Sot dl 19 1550611 7003
BSx5352 61 MM Le24bb4 0189592 T i
‘Section five. Testing
48, Product pressure testing,
‘Section six. Preparation for despatch
44, Despatch preparation
‘Appendices
‘A. Application to piping systems with flanges
in accordance with BS 4504 : Part 1
B, Application to piping systems with scrow
threads in accordance with BS 21
C. Type test for bollows used in bellows seal
gate or globe valves
D. Details of butt-weld ends
Tables
1, Pressure/temperature ratings for class 800
screwed and socket-wold end valves
2. Prossure/temperature ratings for bellows
seal valves
3, End type availability according to class and
size of valve
4, Minimum body and bonnet wall thickness
{excluding pipe ends)
5, Minimum port diameter and seat bore
6. Minimum outside diameter or dimension
across flats of body ends
7. Mivinsuin wear waved
8 Minimum stem diamater for wedge gate valves
9. Minimum stem diameter for globe valves
10. Packing and stuffing bex dimension
11, Valve trim material
‘Tia, Required production pressure tests
TZ. Naminal pressure, class rating and nominal
size range
a
14, Minimum outside diameter of sealing face for
valves with parailel threads in accordance
with BS 21
15. Dimensions of butt-weld ands
Figures
Typical wodge gate valve (outside screw)
Typical wedge gate valve (inside screw)
‘Typical globe valve (outside scrow)
Typical globe vatve {inside screw)
‘Typical vertical ball check valve
‘Typical piston/ball check valve
‘Typical bollows seal wadge gate valve
Weld-end far connection to pipe of wall
thickness fof 4.8 mm to 22 mm inclusive
Page
10
18
18
19
ef-s ppe
BSI BSx5352 81 MH LL24LG9 0189593 L Mt
Foreword
‘This British Standard has been prepared under the
diraction of the Mechanical Engineering Standards
Committee and constitutes a revision of BS 2995 : 1966
and BS 3808 : 1964, This now metric standard covers:
classes 800 and 1800 screwed and socket-weld end
‘wedge gate, globe and check valves previously covered by
BS 2995 and BS 3808, also classes 160, 300, 600 end
1500 flanged and butt-weld end wedge gate, globe and
‘check valves previously coverad by BS 3808, BS 1414,
BS 1868 and BS 1873. Apart from metrication, Tho
valves are basically the same, but the list of shell and trim
‘materials has baen extended and bollows sel valves have
eon included,
8S 2995 and BS 3808 are withdrawn on publication of
this standard. Amendments to BS 1414, BS 1868 and
BS 1873 will dalote roferonoos to size 40 mm and,
smaller. BS 2080 will be amended.
The plug valves previously covered in BS 2996 will be
Included in the now metric version of BS 1570.
‘The previous sections in BS 2995 and BS 3808 dealing
with tests and inspection have not been included in this,
these are now the subject ofa separate
BS 6755: Pant
NOTE. Requiremonts or fina inspacton and aupplorvontary
inepestion at all stogos of manutecture previous spectod In
18S 61467 Part 1: 1974 (now withdeawn) should Be ststed by the
purchase Ins enquiry or order . *
‘Similarly, seations in BS 2995 and 8S 3808 dealing with
‘dimensional sizes end tolerances of screwod anc
socket-wold end details have been omitted and cross
‘eferentes made to the appropriate sections of the new
metrio version of 8S 3799, which in turn has boen
‘modified for bore dimensions of sockats to allow use of
pipe in accordance with BS 3600 and BS 1600,
Coy by the rst Stndords Istuon
19 /550:17 2003,
sc
BS 5352 : 1981
Iti the intention that valves complying with the
requirements of this standard shall be interchangeable as,
Units with those of similar type produced by American
manufacturers. In the preparation of this standard,
consideration has therefore been given to the latest
‘edition of API Standard 602.
Valves specified in this standard are primarily intended for
installation as follows:
(0) screwed ends, with pipes or fitings threaded in
accordance with API Standard 58 or ANSI 82.1;
(b) socket-weld ends, with plain end pipe in accordance
with API Standard 5L, BS 1600 or BS 3600;
{c} butteweld ends, with plain end pipe in accordance
with API Standard 51, BS 1600 or BS 3600;
(4) flanged ends, with flanges in accordance with
BS 1560: Part2.
Where valves are for use in piping systems using flanges
in accordance with BS 4504: Part 1 or screw-threads in
accordance with BS 21 attention is drawn to appondix A,
and appendix B respectively
‘This standard can algo be used as a general quide where
valves of material composition outside the scope of
section three of this standard are required as, for example,
for use in highly corrosive services and environments, or
for low temperatures.
Acknowledgoment is made to the American Petrofoum
Institute and to the American National Standards Institute
for data used
Certification. Attention is drawn to the certification
facilities described on the inside back cover. BS 6352 : 1981
BSI BSx5352 81 MM LL24LL9 0189594 3 am
British Standard Specification for
Steel wedge gate, globe and check valves 50 mm and smaller
for the petroleum, petrochemical and allied industries
Section one, General
1, Scope
‘This British Standard specifies requirements for forged,
cast orbar stock steel wedge gate, globe stop and chack
valves with flanged. screwed, socket-weld or butt-weld
fonds, in nominal sizes 50 mm (2 in) ané smaller in classes
1150, 300, 600, 800 and 1500 of the following types.
(a) Wedge gate valves, with outside screw and yoke,
Fising stem, bolted or walded bonnet and bolted gland
(1) reduced bore, compact (class 800 only};
‘and 800 only};
(2) standard bore
(b) Wedge gate valves, with inside screw, rising stem,
and handwheel, bolted or welded bonnet and gland nut,
for use at temperatures up to 425 °C only, and with
screwed and socket-wold ends!
(reduced bore, compact (class 800 only;
(2)standard bore (class 1500 on\y).
(c) Globe valves, including screw down check valves
{straight angle or oblique pattern), outside screw and
yoko, rising stem and handwheol, bolted or welded
bonnet and bolted gland, plug or needle type disk:
(1) reduced bore;
(2) standard bore
(@) Globe valves, including screw down check valves
(straight angle or oblique pattern) inside screw, rising
stem and handwhool, bolted or welded bonnet, gland
nut and plug or needle type disk, for use at temperatures
up 10.425 °Conly:
(1) reduced bore;
(2) standard bore,
NOTE. Serowed and sock wold ond asses 800 and 1500
only
{e] Belows-sealed valves.
(1) wedge gate, with outside screw and yoke, rising
stem, bolted of welded bonnet, screwed or bolted
‘gland, and reduced bore (compact);
(2) globe (straight angle or oblique pattern), with
outside screw and yoke, rising stem, bolted or walded
bonnet, screwed or bolted gland, plug or needle type
disk, and reduced or standard bore.
(f} Check valves, with bolted, welded or union cover:
(1) piston type
(2) bal type (for angle or horizontal flow);
(3) ball type (for vortical flow).
NOTE, The terms vertical, ‘horizontal and ‘angle’ relate tothe
axis ofthe body ends,
for angle or horizontal flowl;
Copa by the ish Stndords Istuon
sc
19 1550: 2003,
2. References
The titles ofthe standards publications referred to inthis
standard are listed on page 20.
3. Definition
For the purposes ofthis British Standard the following
dofinition applies.
nominal size (DN}.A numerical designation of size
‘common to all components in a piping system other than
those designated by outside diameter or by thread size. It
is convenient round number for reference purposes and
is normally only loosely related to manufacturing
dimensions.
NOTE. tis designated by theleters DN followed by @ number
4, Pressure classification
‘This standard applies to velves of the following class
ratings:
150; 300; 600; 800; 1500.
NOTE, The number in thosa class ratings ropresente the primary
service pressure rating of the valve inIb1/in®-
5. Pressure/temperature ratings
5.1 Goneral. The prossure/temperature ratings
applicable to valves covered by this standard shall be in
accordance with tables PE-1 to PE-12 of BS 1560
Part 2: 1970 for the particular shell material exeept that
class 800 valves shell bo in accordance with table 1
tition on certain
NOTE 1. There is, however, @ temperature
trim materials (see 334 and table 11)
NOTE2. Inside serew valves are subject toa service temperature
restition (see 6.2),
NOTE 3. Valves with a bellows sael may be subject to reduced
proscure/tomporatur ratings compared with standard valves
(coos)
NOTE 4, Where valves complying with the requirements ofthis
standard are tobe used at servicn tomporatures below —20"C,
florence should be made to BS 3351. Service empereture
‘ofors to the tamparature ofthe fui in the line at the valve
NOTE 5. Forprassure/temperature ratings fr valvos eupplied for
se in piping systems with flanges in accordance with BS 4504
Part | 00 A2,
5.2 Inside screw valves, Tho following types of valve
shall not be usod at service temperatures excoeding
425°C.
(a} inside serew wedge gate valves;
(b} inside screw globe and screw down check valves.
5.3 Bellows seal valves, The pressure/temporature
ratings for bellows seal valves shall be in accordance with
table 2, and area minimum requirement for valves
complying with the requirements ofthis standard and
having a body rating in excess of the values specified in
tablo 2; for valves with a lower body rating, the velues
specified in table 2 shall still apply “BSI BS*5352 81 MM LL24LG9 0189595 5 ml
Table 1. Pressure/temperature ratings for class.
800 screwed and socket-weld end valves
BS 5352 : 1981
Table 2. Pressure/temperature ratings for
bellows seal valves
Service ‘Maximum non-shosk sevice pressure rating
carbon | 1% s¢ehromium- | 6 3 ohromium
stool | ¥simolybdonum | 1% molybdenum
sea stool
“c bart | bart bart
-sowsa | 138 | 138 138
50. 137 | 137 137
15 138 | 135 135
300 iss | 133 133
128 132 | 132 132
180 130 | 130 130
178 120 | 129 129
200 sae | 128 128.
225 12s | 125 125
250 saa | 122 122
278 te | 116 116
300 110 | 110 110
328 103 | 103 103
360 37 | 97 97
375 se | 91 1
400 a1 | as 86
425 n | 80 80
450 ss | 74 74
454 ser | 73 73
475 a7 | 68 68
00 34 | ea 63
525 22 | s5r 85
540 18 | 50 50
1 bar= 108 N/mm? =100 kPa,
‘Primary service pressure,
NOTE 1. The above pressure /tomporature ratings are the
Ininimum requirement and valves having ratings in excess of
these may be obtain rom individual manufacturers
NOTE2. The use of valves t temperatures where the creep,
strength might the liking exteion is eubject tothe
tetablishment of design Io.
6. Nominal sizes
Valves of the following nominal sizes are specified inthis
standard
DN 8 (Kin)
DN10 (%in)
DNI5 (sin)
DN20 (Kin)
DN 25 (1in)
DN 32¢ (1% in)
DN40 (1%in)
DN50 (2in)
7. End types
Table 3 specifies the types of ends available for each class
and size of valve covered by this standard,
#Non-preterred size.
Coyrinht by the rsh StndordsIstuon
sc
19 5:50:76 2003,
Service ‘Manu non-ehock | Tost presaure|
temperature | sonvce protaure rating
{eoonatet and 3} Body _| seat
“c bar bar | bar
-sot03s | 09
50 98
6 97
100 96
125 95
100 94
178 93
200 31
225 90
250 87 |
278 83
300 3 150 | 103
325 75
350 n
375 7
400 63
425 59
450 55
454 st
475 47
‘500 34
525 22
540 16
Primary eorvieo procure
NOTE 1. The above prossure/temperature ratings apply tothe
bellows sealing eloment and are a minimum requirament for
valves complying with this standard; bellows ratings higher than
the values lsted above may be obtainable from inivisual
‘manutacturors who should be consulted as to the maximum
pressure/temperature ratings applicable to thelr particular
product,
NOTE 2. The use of valves at eomperatures where the croep
strength mightbe the limiting tera is subject vo the
establishment of a design ie
Table 3. End type availability according to class
and size of valve
Nominal
Claes
size ~
ow ro [200 [oo | eo | 1600
8 = |e e- [---
10 = Je [= je= |==-
18 a |a ja lac |aae
20 a la ja [ac jase
25 a la fa [ec jasc
32 a la ja loc jase
40 a |a ja loc jaae
50 a fa ja [ee fase
Note
‘A donotes flanged onde and butt-wald ends;
B denotes screwed end
Cadanotes socket-weld ends BS 6352 : 1981
8, Information to be supplied by the purchaser
Certain clauses of this standard permit alternatives and
the purcheser may require features which depart from this
standard, The purchaser shal statin his enquiry and
purchase order, the following
(a) Type, class rating and nominal sizo, standard or
reduced bore (see clauses 1,4,6 and 9.3)
(b} Whether screwed, socket-weld, flanged or butt-weld
tends ere required (soe clause 7)
(1) flanged ends are required, whether welded-on
flanges ere acceptable, and type of facing (see 9.5)
(2) Ifbutt-weld ends are required, state the pipe
‘schedule number or wall thickness, and outside
diameter (see clause 9.7)
(3) If serewed ends are roquirod, state form of thread
required (see 9.4),
{c) Whether a bolted or welded bonnet/coveris
required (see 9.8), or a union nut for check valves,
(soo 22.1)
( Whether a particular form of disk is required (see
clause 18)
{6) Stuffing box requirements forbellows seal valves
(see clause 17)
(The body and bonnet/cover material (see clauso 23),
(a) The body and bonnst/cover gasket type (see
clause 26).
{hl The bellows material {see clause 32).
{0 The nominal tim material (s90 clause 33).
(i) State if any special packing is required, and specity
packing design temperature if above 400°C, orf the
design pressure is above 60 bar (see clause 34).
(ki Material for bonnet/cover bolting, if required for
‘operation at process design temperatures below
=30 “Cor above 400 °C, o fr othor special operating
conditions (see clause 38)
(0) Special material requicomants for valves in highly
corrosive environment or for low temperature service
(see clause 37).
(m) Whether any additional markings are required (see
clauseat),
‘ini Whether @ lower seat test leakage rate is required for
check valves (see clause 43)".
{0} Requirements for special packaging (see 44.6).
Table 5. Minimum port diamieter and seat bore
BSI BS*5352 81 MH Lb24L69 OLBIS%b 7 mm
Section two. Design
9. Shell
9.4 General. The shell shall be designed to resist the
‘maximum pressure ratings, to minimize pressure loss and
‘to minimize corrosive and erosive effects,
9.2 Body and bonnet wall thickness. With the exception
of pipe ends, the minimum wall thickness of body and
bonnet, measured at any point, shall be not less than that
specifiedin table 4,
Table 4. Minimum body and bonnet wall
thickness {excluding pipe ends}
Nominal | Minimum body and bonnet wall hicknoss
ite
bn {ass 180,300, 600and800 | ctass 1800
Stancardbore
Standardbore | Reduced bore
8 33 20 -
10 4d 33 = e@
16 43 aa 52
20 56 4a 84
25 5a [ss 87
32 6 68 78
40 m1 61 78
50 75 mM a6
9.3 Port diameter and seat bore: The body end ports
shallbe circular, The port diameter and seat bore shall
comply with tho valuae epecifiod in table 6.
9.4 Body onds for serewed-end and socket-weld ond
valves
9.4.1 General, The outside diameter or dimension across
flats of body ends for al types of screwed-end and
socket-weld end valves shall be not loss than the
‘minimum values specified in table 6 for lasses 800 and
1500.
9.42 Socket-weld ends. Socket-wold end valves shall
have circular ends and end faces machined square to the
axis, Socket details shall comply with the requirements of
BS 3799,
9.4.3 Screwed ends. Screwad-end valves shall be of an
‘appropriate shape to facilitate tightening and shell have
either hexagonal or circular ends, The ends shall project
clear of the body to permit the affective use of a pipe
Hominsase | Minimum por dlamoterandcat bore
Segre | [ewww
meg
Standardbore | Reducedbore | Standardbore | Reduced bore | Standard bore | Standard bore
Copyriht b the rsh Stndords Instuon
Sot dl 19 155079 7003 BSI BSx5352 al
‘wrench. For screwed-end valves with hexagonal ends the
across flats dimension shall be suitable for use with
open-ended spanners complying with the requirements of
Bs 192,
Thread lengths shall comply with the requirements of
BS 3799, Tho throad shall be in accordance with either
{API Standard 6B or ANSI B2.1 unless otherwise stated
by the purchaser.
9.5 End flanges. End fianges shall comply with the
requirements of BS 1560 : Part 2. The type of flange
facing sholl be specified by the purchaser and shall bs one
cof the types shown in igure 1 of BS 1660: Part 2: 1970,
End flanges shall be either:
(a) forged: or
(b} cast integral with the body; or
(c] welded to the body, if agreed between manufacturer
and purchaser.
‘The welds of end flanges attached by butt welding shall
comply with the requirements of BS 3351. The
attachment of flangos by othor welding processes shall be
the subject of agreement between the manufacturer and
the purchaser.
9.6 Face-to-face and end-to-end dimensions.
Face-to-face dimensions for flanged-end valves and
end-to-end dimonsions for butt-weld end valves and
ring-joint end valves shall conform to the dimensions,
specified in BS 2080.
9.7 Butt-weld ends. Butt-weld ends shall conform tothe
details specified in appendix D. For burt-weld ends, tho
purchaser shall state either:
(a) the pipe schedule number and outside diameter; or
(b) the pipe wall thickness and outside diameter.
Table 6. Minimum outsi
across flats of body ends
le diameter or dimension
Nominal aize
on
Minimam outside diameter or dimension
‘sorose flats of body ends
(toes 800,
‘Ub24b69 0289597 9 me
Tho bonnet or cover
shall be attached to the body by means of either:
(2) bolting (see clause 11); or
{b) if specified on the purchase order, welding
complying with the requirements of BS 3351.
9.9 Flanges between body and bonnet/cover. For
bonnet/cover attachment by bolting, the mating flange
between the body and bonnet/cover shall be of a suitable
shape to provide adequate strength. The joint between
body and bonnet/cover shall be ofa type that confines the
gasket
10. Backseat face
A bbackseat face shall be provided for wedge gate and,
globe valves.
Cora by the ris Stndords Istuon
19 5:50:57 2003,
sc
BS 5352 : 1981
11. Bolting
11.1 This clause is concerned only with that bolting
forming part ofthe valve and is not concerned with bolting
for flanged connections between the valve and a pipeline
orpipe fitting
11.2 The working stress in bolting material for
bonnet/cover flanges at the primary service pressures
aiven in clause 6 shall not exceed 62 N/mm2, assuming
that the pressure acts upon an area circumscribed by the
‘outside periphery of the gaskot or, for a ring joint, that the
pressure acts through the pitch circle of the ring joint.
Bonnet/cover flange bolting shal be of the stud or stud
bolt type. Not less than four bolts shall be used in eny
flange and no bolting shall be less than 10 mim (% in)
diameter. Stud bolts and nuts shall comply with the
requirements of BS 4882 except that any bolting smallor
than % in shall be screwed in accordance with BS 2693
Part t (UNC) or BS 4439 {metric} to the tolerance grade
specified in BS 4882. Studs shall comply with tho
requirements of 8S 2693 : Part 1 or BS 4439 as rogards
dimensions and BS 4882 as regards material.
NOTE, Studs need not be of the wrench fit type.
11.3 Gland bolting shall be one of the following types:
(a) hinged bolt secured by either « headed bolt ps
through the eye and secured by a nut, or a pin passed
through the eye and effectively secured;
(b) ewing bolt having an integral eye mounted on
trunnion, forged or cast with the bonnet/cover;
(c) stud bolt passed through a plain hole inthe flange on
‘the bonnet/cover neck and secured to the flange by
twonuts;
(a) stud bolts screwed into a tapped hole in the flange
(on the bonnet/cover neck and secured by a lock nut;
{e} headed bolt passed through a plain hole inthe flange
fon the bonnet/cover neck, and secured by a nutif
required.
Bolts, stud bolts and nuts shall be threaded metric or UNC
‘and the dimensions of the threads shall comply with the
requirements of BS 4882, BS 1768 (below 12 mm (% in)
nominal sizo), BS 1769, BS 3692 or BS 4190 except
that a square head, side head and tee head bolts are
acceptable.
12. Direction of flow
| check valves of the vertical or angle pattern are used,
the flow shall be in the upward direction.
NOTE. For the purposes of this standard, any line with a slope
{upward or downward) of 8“ ortoss Is Goomed tobe horlzontal.
Globo valves shall be designed to be suitable for
installation in either diraction of fiow but the preferred
direction of flow for globe valves shall be from
under the disk.
13. Nameplate
‘The nameplate chall be located on top of the handwheel,
the side of the yoke or the side or top of the cover, or
provided that the minimum thickness shall be retained, by
driling or pinning to the wall of a pressure-containing part.
14. Wedge
‘The wedge of wedge gate valves shall be of the solid type
with integral or deposited faces. The sharp outer edges of
the seating surfaces shall be removed to prevent scoring
of the body seating surfaces, Coa by te ris Stondords sition
sc
BS 6362 : 1981
‘The wedge shell be guided in tho body to prevent rotation
‘and to ensure re-entry between the seats. The wedge
shall be provided with a slot at the top to raceive the
button or teehead of the stem. The minimum values of
Wear travel shell bein accordance with table 7.
15, Disk and disk nut
‘The disk of globe valves shall be of either:
(a) the fat-faced type; or
(b) the plug type; or
(c) if specified by tho purchaser, the needle-point type,
either ioose or intageal with the etorn,
‘When assembied, the disk shall bo retained on the stem in
such a way as to prevent any possiblity of it becoming
detachod in service. Where a disk nutis used it shall be
securely locked in place,
‘When in the fully-opened position, the net erea between
the disk and the seat shall be atleast equal to the area
through the seat (see 9.3),
16.Stem
16.1 The minimum stem diameter, measured where it
passes through the packing, shall be as specified in
tables 8 or 9 for wedge gate and globe valves
respectively.
NOTE, These minimum stom diameters may not be adequate for
allseating design, stem materials and service conditions.
16.2 The stem shall have a bevelled, spherical or flat seat
machined on it to seat on to the backseat when the valve
is fully opened or, for globe valves, tho avating ahalll be on
the stem oron the disk nut.
16.3 Stem threads shall be of ACME or other trapezoidal
form for stem diameters 12 mm and above. For smaller
stem diameters the choice of throad shall be at the option
of the manufacturer.
16.4 On inside screw gate and all globe valves the stom
shall be of sufficient langth to ensure that the handwhee!
stands clear of the yoke when the valve isin the worn
closed position. The upper end of the stem shall be
provided with positive and adequate location for mounting
the handwheel, eg. a square end, keyway or other suitable
16,5 Stems on gate vaives shall have an integral end, in
the form of a techead, fitting into. slot in tho top of the
wedge to provide flexibility between the stem and wedge,
‘Threaded o pinned connections between the stem and
the wedge shall not be used. The design of outside screw
‘stems shall be such as to prevent the wedge leaving the
stem, or the base of the stem turning in che wedge during
‘operation of the valve. Stoms for inside screw valves shall
have an integral end in the form of a button which rotates
during operation of the valve,
16.6 The design of the stom disk attachment on globe
valves shall be such that the disk can articulate to pormit
correct alignment with the seat, the thrust point being of
radiused form, and shallbe such that the disk cannot
become detached in service, Retention shall be by an
effective method.
16.7 Stems on noodle valves shall have the disk as an
integral part or alternatively shall be such that the needle
‘can articulate to permit correct alignment with the seat,
the thrust point boing of radused form, The stem shall be
such thet the disk cannot become detached in service.
Rotention shall be by an effective method,
19 5:50:56 2003,
“BSE BS¥53S2 61 MM 1L24b69 O18
17. Stuffing box
The stuffing box shail be integral with the bonnat/eover
and shall be flat bottomed. The relationship between the
stuffing box diameter and the stem diamoter shall be such
that the packing size specified in table 10 can be
accommodated. The depth of the stuffing box shail be not
less than six times the nominal packing width specified in
table 10,
Table 7. Minimum wear travel
Table 8. Minimum stem diameter for wedge gate
valves
Nominal meter
size
bn Classes 160,300, 600 and800 | ciass 1600
- Standard bore
Stondardbore | Reducedtbore
8 70 70 -
10 a5 70 =
15 85 35. 125
20 119 98 145
28 125 110) 180
sz. | tas 125 178
40 160 145 190
50 190 160 205
Table 9. Minimum stem diameter for globe valves
Nominal | Minimur ater diarmater
0
DN Classes 160,300,600end 900 | Class 1600
Standard bore
Standardbore | Reduced bore
8 80 30 -
10 95 0 =
is 110 85 125
20 125 119 160
25 145 128 180
32 160 145 19.0
40 130 160 19.0
50 130 190 205
Table 10. Packing and stuffing box dimensions
Nominat
pecking wath
‘Nominal stom diameter
7.0 up oand including 95 2 @
Anove 9 upto andintuting 12.5 a0
‘Above 12 untoond ncn 180 50
‘ove 180 60 BSI BS*5352 61 i
18. Yoke, yoke sleeve and yoke bush
18.1 Yoke, The yoke shall be either integral with the
bonnet or screwed and secured effectively on to the
bonnet.
18.2 Yoke sleeve, The yokes sleeve on wedge gate valves
shall be machine finished on all contact surfaces.
18.3 Yoke bush. The yoke bush on globe valves shall be
cither serewad or othorwise fitted into the yoke and
locked in position.
19. Body seat and body seat ring
19:1 Body seat The body seat shall be either.
{a} integral with the body shel; or
{b} aseparete insert; or
(clin the case of steel shells, a hard faced deposit
19.2 Body seat ring. If fitted, the body seat ring shall be
secured in such a way that it cannot loosen in service. The
seat ting in globe valves shall be scravred in and either
shoulder-seated or bottom-seated and provided with lugs,
slots or a hexagon socket to facilitate removal. The
dimension of the seat bore shall be as specifiod in table 6,
20. Handwheel
20.1 The handwheel shall be preferably of a spoked
design with knobs or studs projecting beyond the outside
diameter of the whee! to provide an effective grip. Valves
shall be closed by turning the handwheel in a clockwise
direction, The handwheel shall be suitably marked with an
arrow and the word ‘OPEN’ or ‘CLOSE" or ‘SHUT’ (as
appropriate) to indicate the operating direction of rotation,
20.2 The handwheel shall be secured to the yoke sleeve
‘or stom in such a way as to preclude loosening in service,
21, Bellows seal
Exoopt for the teohead or button, the whole of the stem,
back seating arrengement and stem packing shall be
isolated from the line medium by a flexible metallic
bellows.
‘Tho bollows shal be attached to the bottom end of the
stem and the body or bonnet by welding. Globe valve
‘stems shall be prevented from rotating by provision of 2
‘spline or similar arrangement.
The design of the bellows and attachment shall
that the valve head assombly is capable of a
cycle lfe of 10 000 cycles for globe valves and
2000 cycles for wadge gate valves where one cycle is
specified as fully open to fully closed to fully open.
‘The suitability ofthe bellows assembly design shall be
demonstrated by means of prototype tests upon
representative samples in accordance with appendix C.
22. Check valves
22.1 Covers. Valvos shall be provided with bolted or
‘welded covers or union nuts, a8 specified by the purchaser
(see also 9.8). IF union nuts are used they shall be of
hexagonal or octagonal shape.
NOTE, The outer surface ofthe union nuts need not be machined,
Union joints shall be of the male and female type wi
gasket,
22.2 Cheok mechanism. Tho chock mechanism shall
either be ofthe piston type as specified in 22.2.1 or of the
ball type specified in 22.2.2.
such
Ub2aubb? 0189599 2
BS 5352 : 1981
22.2.1 Piston type. The piston shall be in the form of a
cylinder, the lower end of which is shaped to form a
seating face. The cylindrical part shall fit into the shell or
guide, with a bleedhole, 50 as to make an effective