1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationThermostatic mixing valves for use in care establishments Requirements and test methodsBS 7942:20nullnullBS 7942:2011 BRITISH STANDARDnullublishing and conullnullright informatio
2、nThe BSI copyright notice displayed in this docnullnullent indicates nullhen the docnullnullent nullas last issnullednullnull BSI 2011ISBN 97null 0 nullnull0 nullnull2null7 2InullS 91null140null70The nullollonulling BSI renullerences relate to the nullornull on this standard: nullonullnullittee renu
3、llerence Bnullnull04 Dranullt nullor conullnullent 09nullnull01null272null Dnullnullublication histornullnullirst editionnull nullannullary 2000Second nullpresentnull editionnull nullannullary 2011nullmendments issued since nullublicationnullate Text affected null BSI 2011 null iBS 7942:2011BRITISH
4、STANDARDnullontentsnullorenullord iii0 Introdnullction 1null Scope 12 Nornullatinulle renullerences 2null Ternulls and denullnitions 24 Tnullnull nullaterials 4null nulllassinullcations 4null Bacnullnullonull prenullention denullices 47 Renullonullanullle denullices nullRDsnull 4null Specinullens an
5、d test senullnullences 59 nulleanulltightness 6null0 Dnullranullility 11nullnull nullernullornullance 11null2 Designation 19nullnull nullarnulling 20null4 Installation and operating instrnullctions 21nullnnexesAnnenull A nullnornullatinullenull Apparatnulls and nulleasnullrenullents nullor dnullranu
6、llility test on thernullostat 22Annenull B nullnornullatinullenull Test nullor the dnullranullility onull onnullonullnull nullonull control 26Annenull null nullnornullatinullenull Test nullor the dnullranullility onull nullannullal dinullerters 27Annenull D nullnornullatinullenull Test nullor the dn
7、ullranullility onull dinullerters hanulling an anulltonullatic retnullrn 28Annenull null nullnornullatinullenull Test nullor the dnullranullility onull thernullostat 29Annenull null nullnornullatinullenull Apparatnulls nullor pernullornullance tests 30Annenull null nullnornullatinullenull Deternulli
8、nation onull thernullonulleter response tinulle 33Annenull H nullnornullatinullenull Test nullor nullonull rate and sensitinullity onulltenullperatnullre control 35Annenull I nullnornullatinullenull Tests nullor Tnullnulls hanulling electronic tenullperatnullre adnullnullstnullent 35Annenull null nu
9、llnornullatinullenull Test nullor nullinullednullnullater tenullperatnullre onullershoot on operation onull dinullerter nullnullannullal or anulltonullatic retnullrnnull 38Annenull null nullnornullatinullenull Test nullor nullinullednullnullater tenullperatnullre onullershoot on operation onull seco
10、nd onulltlet 39Annenull null nullnornullatinullenull Test nullor nullinullednullnullater tenullperatnullre onullershoot starting nullronull anullnullient tenullperatnullre 40Annenull null nullnornullatinullenull Test nullor nullinullednullnullater tenullperatnullre onullershoot on adnullnullstnullen
11、t onull nullinullednullnullater tenullperatnullre 41Annenull N nullinnullornullatinullenull Assessnullent onull transient nullalnulles 42Annenull null nullnornullatinullenull Test nullor thernullal shnulltnullonullnull 43Annenull null nullnornullatinullenull Test nullor tenullperatnullre stanullilit
12、y nullith changing nullater snullpply pressnullre 44Annenull null nullnornullatinullenull Test nullor tenullperatnullre stanullility nullith changing nullater snullpply tenullperatnullre 45Annenull R nullnornullatinullenull Test nullor tenullperatnullre stanullility at rednullced nullonull rate 46An
13、nenull S nullnornullatinullenull Additional testing anullter nullailnullre to nulleet pernullornullance and dnullranullility renullnullirenullents 47Annenull T nullinnullornullatinullenull Snullnullnullary onull thernullal pernullornullance renullnullirenullents 48Annenull null nullinnullornullatinu
14、llenull Reconullnullendations on conullnullissioning and innullsernullice tests 49Annenull null nullinnullornullatinullenull nullrenullnullency onull innullsernullice tests 51Binullliography 52BS 7942:2011ii null null BSI 2011BRITISH STANDARDnullist of nullguresnullignullre 1 null Specinullen test s
15、enullnullences 5nullignullre 2 null Hydranulllic resistance nullor lonull pressnullre dinullerters nullith anulltonullatic retnullrn 10nullignullre Anull1 null Test rig nullor dnullranullility test on thernullostat 22nullignullre Anull2 null nullressnullre tanullenullonullnull tee 24nullignullre nul
16、lnull1 null Test rig nullor pernullornullance tests 31nullignullre Nnull1 null nullnullanullple onull transient tenullperatnullre nullariation 42nullist of tablesTanullle 1 null Tnullnull general nullse conditions 1Tanullle 2 null nullinullednullnullater tenullperatnullre 2Tanullle null null Test pr
17、essnullres nullor nullannullal dinullerters 9Tanullle 4 null Test pressnullres and hydranulllic resistances nullor dinullerters nullith anulltonullatic retnullrn 10Tanullle null null nulllonull rates 13Tanullle null null nullinullednullnullater tenullperatnullre settings nullor deternullination onul
18、l nullonullrate and sensitinullity 14Tanullle 7 null Initial settings nullor thernullal pernullornullance tests 15Tanullle null null nullernullitted dnullration onull transient nullinullednullnullater tenullperatnullre rise 16Tanullle 9 null nulleanullage nullonull onull cold nullater 18Tanullle 10
19、null nullhanges in nullater snullpply pressnullre and pernullitted tenullperatnullre change 18Tanullle 11 null nullhanges in nullater snullpply tenullperatnullre and pernullitted tenullperatnullre change 19Tanullle 12 null Rednullced nullonull rates and pernullitted tenullperatnullre change 19Tanull
20、le 1null null Designation codes 20Tanullle Anull1 null Dinullensions onull pressnullre tanullenullonullnull tees 24Tanullle Bnull1 null nullressnullre onull nullater snullpply nullor dnullranullility tests 26Tanullle nullnull1 null Settings nullor thernullostat dnullranullility test 29Tanullle Snull
21、1 null nullanullinullnullnull nullargins onull nullailnullre 47Tanullle Tnull1 null Snullnullnullary onull thernullal pernullornullance renullnullirenullents nullor each sanullple 48Tanullle nullnull1 null Reconullnullended nullanullinullnullnull continnullonulls tenullperatnullre dnullring site tes
22、ts 50Summarnull of nullagesThis docnullnullent conullprises a nullront conullernull an inside nullront conullernull pages i to inullnull pages 1 to null2null an inside nullacnull conuller and a nullacnull conullernullnull BSI 2011 null iiiBS 7942:2011BRITISH STANDARDnullorenullordnullublishing infor
23、mationThis British Standard is pnullnulllished nully BSI and canulle into enullnullect on null1 nullannullary 2011null It nullas prepared nully Technical nullonullnullittee Bnullnull04nullWater supplynull A list onull organinullations represented on this conullnullittee can nulle onulltained on renu
24、llnullest to its secretarynullSunullersessionThis British Standard snullpersedes BS 7942:2000null nullhich is nullithdranullnnullnullnformation about this documentThis British Standard has nulleen denulleloped to conullplenullent the enullisting Tnullnull standardsnull BS nullN 1111 and BS nullN 12n
25、ull7null nullhere a particnulllar risnull onullscalding enullists to the nullsernullnullse of this documentIt has nulleen assnullnulled in the preparation onull this British Standard that the enullecnulltion onull its pronullisions nullill nulle entrnullsted to appropriately nullnullalinulled and en
26、ullperienced peoplenull nullor nullhose nullse it has nulleen prodnullcednullnullresentational conventionsThe pronullisions onull this standard are presented in ronullan nullinullenull nullprightnulltypenull Its nullethods are enullpressed as a set onull instrnullctionsnull a descriptionnullor in se
27、ntences in nullhich the principal anullnulliliary nullernull is nullshallnullnullCommentary, explanation and general informative material is presented in smaller italinull type, and does not nullonstitute a normative elementnullnullontractual and legal considerationsThis pnullnulllication does not p
28、nullrport to inclnullde all the necessary pronullisions onull a contractnull nullsers are responsinullle nullor its correct applicationnullnullomnullliance nullith a British Standard cannot confer immunitnull from legal obligationsnullBS 7942:2011inull null null BSI 2011BRITISH STANDARDnullnullis pa
29、ge delinullerately left nulllannullnull BSI 2011 null 1BS 7942:2011BRITISH STANDARD0 nullntroductionnullsers onull hot nullater nullor anulllnulltionary pnullrposes in care estanulllishnullents are onullten snullsceptinullle to innullnullry nully scaldingnull It has nulleen recogninulled that the ri
30、snull onull this occnullrring can nulle attennullated nully the nullse onull thernullostatic nullinulling nullalnulles nullTnullnullsnullnull This British Standard has nulleen denulleloped so that the linullelihood onull Tnullnulls enullitting scalding hot nullater and harnulling nullsers in care es
31、tanulllishnullents can nulle signinullcantly rednullcednull BS 7942 therenullore nullocnullses specinullcally on the renullnullirenullents nullor Tnullnulls nullsed in care estanulllishnullents and not on renullnullirenullents nullor Tnullnulls nullsed in nornullal donullestic sitnullations nullith
32、a less nullnulllneranullle nullser pronulllenull Tnullnulls nullsed in nornullal donullestic sitnullations are conullered nully other standards snullch as BS nullN 1111 and BS nullN 12null7nullThe test nullethods ginullen in BS 7942 are nullased on the nullorstnullcase snullpply conditions linullely
33、 to occnullr in a care estanulllishnullentnullnull SconulleThis British Standard specinulles pernullornullance and nullaterial renullnullirenullents and ginulles test nullethods nullor three types onull Tnullnullnull onull nonullinal sinulle nullp to and inclnullding DN2nullnull nullor nullse in car
34、e estanulllishnullentsnull The Tnullnulls conullered nully this standard are those nullhich are snullitanullle nullor the hot and cold nullater snullpply pressnullres and tenullperatnullres ginullen in Tanullle 1null and those nullhich are snullitanullle nullor the applications ginullen in Tanullle
35、2nullAnnenull A to Annenull null ginulle the apparatnulls and test nullethods nullor the dnullranullility onull Tnullnullsnull Annenull null to Annenull null and Annenull null to Annenull S ginulle the apparatnulls and test nullethods nullor the pernullornullance onull Tnullnullsnull Annenull N ginu
36、lles an assessnullent onull transient nullalnullesnull Annenull T ginulles a snullnullnullary onullthernullal pernullornullance renullnullirenullents and Annenull null and Annenull null ginulle reconullnullendations nullor conullnullissioning and innullsernullice testsnullTanullle 1 Tnullnull genera
37、l use conditionsnullressurenulltemnullerature range nulligh nullressure nullnullnullnull nullonull nullressure nullnullnullnullnullperating pressurenullanullinullnullnull static nullater pressnullre nullnullnullanull 1null0 1null0nulllonull pressnullrenull hot and cold nullnullnullanull 0null1 to 0n
38、ullnull 0null02 to 0null1nullperating temperatureHot snullpply tenullperatnullre nullnullnullnull nullnull to nullnull nullnull to nullnullnullold snullpply tenullperatnullre nullnullnullnull null to 20 null to 20BS 7942:20112 null null BSI 2011BRITISH STANDARDTanullle 2 nullixednullnullater temnull
39、eraturenullnullnulllication nullesignation Anullnullixednullnullater temnullerature nullat nulloint of dischargenullnullnull nullanullnullBidet HnullnullBnull Bnullnull nullnullnullBnull Bnull nullnullShonuller HnullnullSnull Snullnull nullnullnullSnull Snull 41 nullashnullasin Hnullnullnullnull nul
40、lnullnull nullnullnullnullnull nullnull 41Bath null44 nullnull nullllnull HnullnullT44null nullnullnullT44 44Bath null4null nullnull nullllnull HnullnullT4nullnull nullnullnullT4null 4nullBath and shonuller nullinuller null44 nullnull nullath nullllnull HnullnullD44 nullnullnullnullD44 41 nullshonul
41、lernullnull 44 nullnullathnullBath and shonuller nullinuller null4null nullnull nullath nullllnull HnullnullD4nullnull nullnullnullD4null 41 nullshonullernullnull 4null nullnullathnullnullnullnullnull nullor nullasnullnullasins, nullasnulling is assumed to tanulle planulle under running nullaternull
42、AnullA Tnullnull nullith a dinullerter designation nullDnull has the capanullility to change and control the nullinullednullnullater onulltlet tenullperatnullre in line nullith the tenullperatnullres denullned anullonulle nullhen the snullpply path is changed nullronull nullath to shonuller or shonu
43、ller to nullathnull2 nullormative referencesThe nullollonulling renullerenced docnullnullents are indispensanullle nullor the application onull this docnullnullentnull nullor dated renullerencesnull only the edition cited appliesnull nullor nullndated renullerencesnull the latest edition onull the r
44、enullerenced docnullnullent nullinclnullding any anullendnullentsnull appliesnullBS null920null1null nulluitanullility of nonnullmetallinull produnullts for use in nullontanullt nullitnullnullater intended for nulluman nullonsumption nullitnull regard to tnulleir effenullt on tnulle nulluality of tn
45、ulle nullater null nullart 1null nullpenullinullnullationBS null920null2 nullall sectionsnullnull nulluitanullility of nonnullmetallinull produnullts for use in nullontanullt nullitnull nullater intended for nulluman nullonsumption nullitnull regard to tnulleir effenullt on tnulle nulluality of tnul
46、le nullater null nullart 2null nulletnullods of testBS null920nullnullnull nulluitanullility of nonnullmetallinull produnullts for use in nullontanullt nullitnullnullater intended for nulluman nullonsumption nullitnull regard to tnulleir effenullt on tnulle nulluality of tnulle nullater null nullart
47、 3null nullignull temperature testsBS null920null4null nulluitanullility of nonnullmetallinull produnullts for use in nullontanullt nullitnullnullater intended for nulluman nullonsumption nullitnull regard to tnulleir effenullt on tnulle nulluality of tnulle nullater null nullart 4null nulletnullod
48、for tnulle nullCnullnull identinullnullation of nullater leanullnullanullle organinull sunullstannulles null Terms and denullnitionsnullor the pnullrposes onull this British Standardnull the nullollonulling ternulls and denullnitions applynullnullnullnull bacnullnullonull nullrevention devices nulln
49、ullnullnullnull associated bacnullnullonull nullrevention device nullalnulle or nullechanisnull that prenullents nullater nullronull nullonulling in the opposite direction to that nullhich it is intended and that is not nullnullilt into a Tnullnullnullnullt is designed nullor nullse nullith itnull BSI 2011 null nullBS 7942:2011BRITISH STANDARDnullnullnullnull2 integral bacnullnullonull nullrevention device nullalnulle or nullechanisnull nullnullilt into a Tnullnull that prenullents nullater nullronull nullonulling in the opposite direction to that nullhich it is intendednullnull2 care estab
