Bsi bs au 050 3 8 1985 (2001)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 50 3 8 1985 Incorporating Amendment No 1 Tyres and wheels — Part 3 Valves — Section 8 Code of practice for the selection and care of tyre inflation valves for[.]

Incor por a ting

A mend ment No 1

U C 6 9.1 3.0 2.5 1–3 6.2

N COPYIN WITH U BSI P R MIS IO E C P AS P RMIT ED BY COPYRIG T LAW

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stan ard:

Commit e reference A E/ 4

Draft for comment 8 / 71 4 DC

ISBN 05 0 1 3 7 9

Th e prep ration of this BritishStand rd was entrusted b the Automobie

Stand rds Commit e ( AUE/-) to Tech ical Commit e AUE/ 4 upon wh ich the

folowing bodies were represented:

Ag ricultural Eng ine r ’ Association

British In dustrial Truck Association

British Pres ure Gaug e Man facturer ’ A ssociation

British Rub er Man facturer ’ A ssociation

Bus and Coach Cou ci

Dep rtment of Transport

London Transport Executiv e

Ministry of Defence

Motor Cy cle Association ofGreat Britain

Motor Industry Resear h Association

Retrea Man facturer ’ A ssociation

Roa Haula e As ociation Ltd

Society of Motor Man facturer and Trad er L imited

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

1 0 3 June 20 1 Indicated b a sid el ne

Pag e

8.7 Check l st for care of inflation v alv es for commer ial v ehicles 2

This section of BSAU5 -3 has be n prep red un der the direction of the

Automobi e Stand rds Commit e This cod e ofpractice g iv es guid nce to v ehicle

man facturer on the initial steps to be taken in selectin g v alves for commer ial

v ehicles wh eels

Recommend tions are also giv en on the care of v alv es, which if fol owed would

lea to improved r oa safety

The d ta in this code of practice are b sed on the information provided b the

Society of Motor Man facturer and Tra er Ltd

Ty re, whe l, r im and v alve requirements are given in the fol owing p r ts and

sections of BSAU5 : Tyr es a nd whe l s:

— Pa r t1: Tyr es;

— Se t on0: Gener a l;

— Se t on1: Car tyr es;

— Se t on2: Commer cia l vehicle tyr es;

— Se t on3: O ff-the-r oa d tyr es;

— Se t on4: A gr icultur a l vehicle tyr es;

— Se t on5: Ind ustr ia l vehicle tyr es;

— Se t on6: Moto cycl e a nd s o ter tyr es;

— Pa r t2: Whe l s a n d r ims;

— Se t on0: Gener a l (includ ing ter ms and d efiniions, a nd constr ucton a nd

wor kma nship);

— Se t on1: R im pr ofil es a n d dimensions (includ ing openings fr va lve );

— Se t on2: Whe l na ve a nd h b c ntr es;

— Se t on3: Whe l a nd h b stud s a nd n ts, a nd bol ts

1)

;

— Secton4: Sup l ementa r y d a ta fr futur e d evelopments

1)

;

— Se ton5: R oa d whe l s ma nufa ctur ed whol ly o pa rtl y o light a l loy f r

pa ss nger ca r s;

— Se ton6: Spe ifica tion fr r oa d whe ls ma nufa ctur ed wholl y o pa r tly o

light al loy f r moped s a nd moto cycles;

— Se ton7: Cod e o pr a ctc fr the s lecton a nd car e o whe l s fr commer cia l

vehicles

1)

;

— Se ton8: Cod e o pr a ctc f r the s l ecton a nd ca r e o whe ls f r pa ss nger

ca r s (includ ing ca r a va ns a nd lght tr a iler s)

)

;

— Pa r t3: Va lve ;

— Se ton1: Va l ve d imensions;

— Secton2: Tyr e va lve thr ea d s5V1,5V2,6V1 a nd8V1;

— Secton3: Tyr e va lve thr ead s9V1,10V2,12V1 a nd13V1;

— Sect on4: Tyr e va lve thr ea d s 8V2, 10V1, 1 V1, 13V2, 15V1, 16V1, 17V1,

17V2, 17V3, 19V1 a nd20V1;

— Secton5: Dimensions f r ISO cor e cha mber No 1 f r tyr e infl a tion va lve ;

— Secton6: Dimensions f r ISO cor e cha mber No 2 f r tyr e infl a tion va lve ;

— Secton7: Cod e o pr actc f r the s l ecton a nd ca r e o tyr e infl a tion va lve

fr pa ss nger ca r s (incl ud ing ca r a va ns a nd light tr a il er s) ;

— Secton8: Cod e o pr actc f r the s l ecton a nd ca r e o tyr e infl a tion va lve

fr commer cia l vehicles

1)

In pre aration

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Sidel ning in th is document indicates the most recent changes b amendment

8.1 Scope

This section of BSA U5 -3 g iv es recommend tions for v ehicle man facturer on the initial steps to be

taken in selecting v alv es for commer ial v ehicle whe ls and recommend tionsfor the care of v alves for the

user

8.2 Valve selection by vehicle manufactur r

When selecting a v alv e for a whe l and tyre as embly it is important to ensure that the cor ect choice is

mad e

Basic factor which influence this choice are:

a) ty e of ty re ( tube ty e or tubeles );

b) inflation pres ur e of the ty re;

c) ty e of whe l

The b sic choice is betwe n tube ty pe and tubeles tyres This would g eneral y be decid ed b th e v ehicle

design an d per ormance requiremen ts and the v lve ty pe is therefore pred etermined

8.3 Types ofvalves

8.3.1 General

Valv es are a ai a le in the folowing two b sic ty pes:

a) tubeles ty pe v alves, which can be either of the rub er sna -n or metal clamp- n ty pes (se 8.3.2);

b) tube ty pe v alves, which can be either one piece or two piece v lv es ( se 8.3.3)

8.3.2 Tubeles valves

8.3.2.1 R ub er sna p-in va lve Rub er sna - n v alv es are av ai a le in sever al diferent lengths and siz s

an d care should be ex er ised in selecting the cor ect siz to suit the rim hole,an d the most suita le leng th

for ease ofac es so as not to be d amag ed in serv ice

The v alv e stem is thr ea ed internal y and exter nal y fo fitment of the v alv e cor e and v alve seal ng ca

respectiv ely

It is es ential that special care should be taken when fit ing rub er sn ap-n v alv es Fir t the rim hole

should be in spected to ensur e it is in g ood con dition and fr ee f om burr s and sharp edg es which can d ma e

the rub er bod y of the v lve Then the rub er bod of the v alve should be lubricated with an a proved

lubricant fo ease of fit ing and inser ted into the r im hole using a special v alv e insertion to l To ensure

th at the v lv e is cor ectly located, it is es ential that the moulded fit ing l ne on the rub er v lv e bod

p s es completely throug h the rim v alv e hole

NOT This ty e of v lv e is suita le for ty re inflation pres ures up t o a ma imum of4 5kPa( 4.7b r or6 psi

8.3.2.2 Cla mp-in va l ve Metal clamp- n v lv es are av aia le in a v ariety of siz s It should alway s be

ensured that the cor ect v alv e is fit ed for the rim hole siz and a plcation Clamp- n v lv es for tubeles

truck ty res are clamped into the r im and an airtig ht seal is achieved b means of a hex gonal n t and

rub er g rommet During fit ing it should be ensured that the v alve is cor ectly located relativ e to the whe l

components to ensure ease of ac es for pres ure checking and a justment

8.3.3 Tube va lves

8.3.3.1 O n e pie e va lve These are rub er b sed or rub er cov ered straight stem v lv es which are

vulcaniz d to the in er tube and bent when required to given angles and d imensions

8.3.3.2 Two pie e va lve These consist of a rub e “ spud” and a pre-bent stem (dimensions ac or ding to

requiremen t) which is at ached to the “ spud” when req uired The two piece v alve is sometimes refer ed to

as “un iv er al”

It is es ential that care is ex er ised to ensure cor ect location of the v alv e in the fla ( where fit ed) and in

th e rim a erture to preven t u neces ary strain on the v alv e in use

I the v alv e is of the univ er al s rew-on ty e it is es ential that it should be fit ed with the cor ect rub er

washer in g ood condition and suficiently tightened to form an airtight seal b contin ing to tig hten down

the stem a further two turns after the stem’s metal washer has touched the rub er washer The v alve

sh ould be al gned b a ditional tightening

8.4 Valve fit ing checks

Whenev er a tubeles ty re or a ty re an d tube as embly is inflated or the inflation pres ure is checked

and/or a justed it is es ential that a final check should be ma e that the v alve has corr ectly sealed Leaking

v lv e cor es should be r eplaced It should not be at empted to cure a leaking v lve b extra tig htening as

this ma d mag e the core seal

It should be ensured that the v alve hole in the r im is in g ood cond ition and is f e fom bur rs which could

d mag e the v lv e and cause d eflation of the ty re

A v lve ca of the ty e which acts as an a ditional air seal and wh ich protects the core f om dirt, d ust an d

water should alway s be fit ed

8.5 Valve acces ibi ity

W here ac es to the v alve for inflation or pres ure checkin g purposes is dificult, a v alve extension ma be

used

I extensions are requir ed to as ist ac es ibi ty for inflation, deflation and pres ure checking , it is

important that they should be securely at ached to the v lv e, prefera ly b l ght wrench tightening

Flexible extensions should be suita ly sup orted

It should be ensured that the extension is of the cor ect leng th and sty le to suit the required a plcation

The seal ng ex tension should be fit ed with a v lv e ca , unles the extension precludes th is

8.6 In- service valve checks

New rub er sna - n v lv es and the rub er components of metal clamp-n v alv es sh ould alwa s be fit ed

when fit ing new replacement tyr es

Rub er cov ered v alv es should be ex mined reg ularly for spl ts and cuts Damag ed v alv es sh ould be

replaced immed iately

All v lv es should be ex amined regularly for d ma ed ca th rea s and/or distorted v lv e mouth where the

ca is fit ed The internal v alv e core threa s should also be ex mined for cleanl nes I the v alv e mouth is

distorted the v alv e should be replaced

The metal p rts of tubeles or tube v lv es can become d ma ed or distorted during their service lfe

Distortions ma hav e weakened the v lve to a point of pos ible f acture and in such cases the v alv e should

be replaced immed iately

It should be ensured that the ra iused v lv e mouth wh ich contacts the ca sealng washer is smo th and

without nicks and bur rs which ma s uf and tear the ca seal

Damag ed ca threa s, internal core thread s an d v alv e mouths should be rep ired with an a propriate and

recommended rep ir to l

8.7 Check l st for car ofinflation valves for com m ercial vehicles

Th e folowing ch eck lst should be used for care of inflation v alv es for commer ial v ehicles

a) Do ensure the v alv e and v alve fit ing is the cor ect

siz and ty pe for the whe ls and usa e, e.g.it is

es ential that clamp- n v alv es are used for inflation

pres ures a ov e4 5kPa( 4.7b r or6 psi

Do not as ume that “ any-old” v lv e or v alve

fit ing is suita le

b) Do reg ularly ch eck on v alv e cores for leakage

Replace d mag ed or leaking cores

Do not at empt to cure leaking v alve cor e b

over-tig htening Damag e to core seat can

easi y r esult

c) Do ensure th at v alv e ca s are alway s fit ed and

replaced after remov al Sealng ty pe v alv e ca s are

prefer ed

Do not leav e v lve ca s on the g rou d when

serv icing They can become d mag ed or lost

d) Do ensure that the v alve holes in tubeles r ims are

in go d condition and the sur ou ding ar ea f e f om

rust, pits and bur s Se k a vice if in doubt

Do n ot at empt to remov e pits, rust an d bur s

b g rinding o hea y fi ing The holes ma

become ir eg ular in sha e an d afect v alv e

sealng

e) Do ensure that after fit ing a rub er cov ered

sna - n tubeles v alve, the indicating ring arou d the

bod is fuly v isible on the outside of the rim This is

an ind ication of cor ect fitment Use an a proved

lubricant

Do not at empt fitment of a sna - n ty pe

tubeles v alv e without the cor ect mou tin g

to l Do not use g rease or dirty lubricant

f) Do ensure th at clamp- n ty e v alv es are cor ectly

positioned and securely fit ed

Do not use ex ces iv e for e to tigh ten clamp- n

v lv e securing n ts

g) Do ex mine regularly the v alve’s rub er fitments

or rub er cov er for c acks or splts and ex amine the

metal portions of the v lv e for distortion and the

th rea s for d mag e Ensure that v alv e mouth is

rou d , smo th and with out n icks or bur s which

would hind er the sealng qual ty of the ca I in

doubt chan ge the v lve or a propriate fitment

immediately

Do not at empt to fi cr acks or spl ts with

p int, or at empt to rep ir v lve distortions,

nor at empt clearing or cleaning of threa

orv alve mouth without the a propriate and

recommended rep ir to l

h) Do ensure that new sna -n v alv es or clamp-n

v lv e rub er fit ings are fit ed when replacing

tubeles ty res

Do not as ume that ty re v lv es wi l last

forev er

i Do ensure that if v lv e extensions are used they are

th e cor ect ty pe and length for the a pl cation and

they are securely tig htened on to the v alve F lexible

ex tensions should be suita ly sup or ted

Do not use an extension if inflation and

pres ure checking can be achiev ed without it

j) Do ensure that v alv es of the u iv er al s rew-on

ty pe are fit ed with the corr ect rub er washer an d

suficiently tig htened to form a seal, b contin ing to

s rew down the stem a further two complete turns

after the stem’s metal washer has touched the rub er

washer Align v lve stem b a ditional tightening

Do not overtig hten u iver al s rew-on ty e

v lves or omit rub er washer no al gn v alves

b uns r ewing stem

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