China ƒe Valve Dɔwɔƒe ƒe Ŋgɔyiyi Ŋutinya (3) .

Valvɔ dɔwɔƒea ƒe ŋgɔyiyi si yi edzi (ƒe 1967-1978) .

01 Egblẽa nu le dɔwɔƒewo ƒe ŋgɔyiyi ŋu

Tso ƒe 1967 va ɖo ƒe 1978 me la, le tɔtrɔ gã siwo va le hadomenuwɔnawo me ta la, ekpɔ ŋusẽ ɖe valvɔ dɔwɔƒea ƒe ŋgɔyiyi hã dzi ŋutɔ. Nusiwo koŋ woɖena fianae nye:

1. Valvɔa ƒe ʋuƒoa nusiwo wowɔna dzi ɖena kpɔtɔna ŋutɔ, eye woƒe nyonyome dzi ɖena kpɔtɔna ŋutɔ

2. Valvɔa ƒe ʋuƒoa dzɔdzɔmeŋutinunya me numekuku ƒe ɖoɖo si dze nɔnɔme xɔm la kpɔ ŋusẽ ɖe edzi

3. Medium nyaƒoɖeamenu valvɔ nuwɔna va zua ɣeyiɣi kpui aɖe ake

4. Wodze mɔ̃ siwo ƒe nyaƒoɖeamenu sesẽ kple esiwo le titina ƒe wɔwɔme si ŋu womewɔ ɖoɖo ɖo o gɔme

02 Wɔ afɔɖeɖewo be nàdidi “valve short line” la ɖe edzi .

Nusiwo wowɔ ƒe nyonyome leʋuƒoa ƒe ʋuƒoadɔwɔƒewo dzi ɖe kpɔtɔ ŋutɔ, eye le ɣeyiɣi kpui aɖe ƒe nyaƒoɖeamenu ƒe ʋuƒo siwo ƒe nyaƒoɖeamenu gã kple titina ƒe nuwɔna siwo wowɔna vɔ megbe la, dziɖuɖua dea asixɔxɔ esia ŋu ŋutɔ. Mɔ̃wo ƒe Dɔwɔƒe Gbãtɔ ƒe Dɔwɔƒe si Kpɔa Dɔwɔnyawo Gbɔ ƒe Dɔwɔƒe Gã ɖo valvɔwo ƒe ƒuƒoƒo aɖe be woakpɔ valvɔ dɔwɔƒea ƒe mɔ̃ɖaŋununya ƒe tɔtrɔ dzi. Le numekuku deto kple numekuku megbe la, valvɔwo ƒe ƒuƒoƒoa tsɔ “Nyatakaka si ku ɖe Nukpɔsusu siwo ku ɖe wɔwɔme ƒe afɔɖeɖewo wɔwɔ na Valvɔ siwo ƒe nyaƒoɖeamenu gã kple titina ŋu”, si wotsɔ yi Dukɔa ƒe Ðoɖowɔha gbɔ. Le numekuku megbe la, wotso nya me be woade yuan miliɔn 52 valvɔ dɔwɔƒea be woawɔ mɔ̃ɖaŋununya ƒe tɔtrɔ atsɔ akpɔ kuxi si nye nyaƒoɖeamenu gã kple titina ƒe hiahiã vevie gbɔvalvɔwo ƒe ʋuƒo kple eƒe nyonyome dzi ɖeɖe kpɔtɔ kaba ale si wòanya wɔ.

1. Kaifeng ƒe kpekpe eve

Le May 1972 me la, Mɔ̃ɖaŋudɔwɔƒe Gbãtɔ wɔ dukɔa me tɔvalvedɔwɔƒewo ƒe dɔwɔwɔ ŋuti nuƒo kpui aɖe le Kaifeng City, Henan Nutome. Dɔwɔƒe 125 kple eteƒenɔla 198 tso valvɔ dɔwɔƒe 88, dzɔdzɔmeŋutinunya me numekuku kple aɖaŋuwɔƒe 8 siwo sɔ, nutome kple dudzikpɔƒe ƒe mɔ̃ɖaŋudɔwɔƒe 13 kple ezãla aɖewo va kpekpea. Kpekpea tso nya me be yewoagbugbɔ dɔwɔƒea ƒe habɔbɔ eveawo kple nyatakakaxɔlawo ƒe habɔbɔa aɖo te, eye wotia Kaifeng High Pressure Valve Factory kple Tieling Valve Factory be woanye nyaƒoɖeamenu gã kple nyaƒoɖeamenu sue ƒe ƒuƒoƒoa ƒe ŋgɔnɔlawo, eye Hefei General Machinery Research Institute kple Shenyang Valve Research Institute ye akpɔ nyatakakaxɔƒe ƒe dɔa dzi. Kpekpea dzro nya siwo ku ɖe “egbegbe tɔtrɔ etɔ̃” hã me eye wosrɔ̃ nu tso wo ŋu, adzɔnuwo ƒe nyonyome dodo ɖe ŋgɔ, mɔ̃ɖaŋu ŋuti numekuku, adzɔnuwo mama, kple dɔwɔƒewo kple nunya ƒe dɔwɔnawo dodo ɖe ŋgɔ. Tso ɣemaɣi la, dɔwɔƒewo kple nyatakakaxɔlawo ƒe dɔwɔna siwo wotɔ te ƒe ade sɔŋ la gadze egɔme ake. Afɔɖeɖe siawo wɔ akpa gã aɖe le valvɔwo wɔwɔ dodo ɖe ŋgɔ kple nɔnɔme si nɔa anyi ɣeyiɣi kpui aɖe la tɔtrɔ me.

2. Gbugbɔ dze dɔwɔƒea ƒe habɔbɔ ƒe dɔwɔnawo kple nyatakakawo ɖɔliɖɔli gɔme

Le Kaifeng Takpekpea megbe le ƒe 1972 me la, dɔwɔƒewo ƒe ƒuƒoƒowo gadze woƒe dɔwɔnawo gɔme ake. Ɣemaɣi la, dɔwɔƒe 72 koe kpɔ gome le dɔwɔƒea ƒe habɔbɔa me, eye valvɔ dɔwɔƒe geɖe mekpɔ gome le dɔwɔƒea ƒe habɔbɔa me haɖe o. Be woate ŋu awɔ ɖoɖo ɖe valvɔ dɔwɔƒe geɖe ŋu alesi woate ŋui la, nuto ɖesiaɖe wɔa ɖoɖo ɖe dɔwɔƒewo ƒe dɔwɔnawo ŋu ɖe wo nɔewo yome. Shenyang Kɔkɔ kple Titina Nyaƒoɖeamenu Valve Dɔwɔƒe, Beijing Valve Dɔwɔƒe, Shanghai Valve Dɔwɔƒe, Wuhan Valve Dɔwɔƒe,Tianjin Valve Dɔwɔƒe, Gansu High and Medium Pressure Valve Factory, kple Zigong High Pressure Valve Factory ye kpɔa Dzieheɣedzeƒe, Dziehe China, Ɣedzeƒe China, Titina Anyiehe, Dzieheɣetoɖoƒe, kple Anyieheɣetoɖoƒe Nutowo dzi. Le ɣeyiɣi sia me la, valvɔ dɔwɔƒea kple nunyadɔwo nɔ vovovo eye wotse ku, eye dɔwɔƒe siwo le dɔwɔƒea lɔ̃ wo ŋutɔ. Le dɔwɔƒea ƒe dɔwɔnawo ƒe ŋgɔyiyi, nuteƒekpɔkpɔwo ɖɔliɖɔli enuenu, kpekpeɖeŋunana wo nɔewo kple wo nɔewo sɔsrɔ̃ ta la, menye ɖeko wòdoa adzɔnuwo ƒe nyonyome ƒe nyonyo ɖe ŋgɔ ko o, ke boŋ edoa ɖekawɔwɔ kple xɔlɔ̃wɔwɔ ɖe ŋgɔ le dɔwɔƒe vovovowo dome, ale be valvɔ dɔwɔƒea ɖo blibo ɖeka, le ɖekawɔwɔ me, asi le asi me Yi ŋgɔ, le nukpɔkpɔ si me dzo le eye wòle dzidzim ɖe edzi la ɖem fia.

3. Wɔ “egbegbe tɔtrɔ etɔ̃” siwo wowɔna le valvɔnuwo ŋu

Le ɖekawɔwɔ me kple Kaifeng kpekpe eveawo ƒe gbɔgbɔ kple Mɔ̃wo ƒe Dɔwɔƒe Gbãtɔ ƒe Dɔwɔƒe si Kpɔa Mɔ̃wo ƒe Kpekpewo Kple Dɔwɔƒe Gãtɔ ƒe nukpɔsusuwo nu la, Mɔ̃wo Ŋuti Numekuƒe Gã la gawɔ ɖoɖo ɖe valvɔwo ƒe “egbegbe tɔtrɔ etɔ̃” ƒe dɔ gã aɖe ŋu ake kple dɔwɔƒe vovovo siwo le dɔwɔƒea ƒe kpekpeɖeŋu veviedodotɔe. “Egbegbe tɔtrɔ etɔ̃” dɔa nye mɔ̃ɖaŋudɔ vevi vevi aɖe, si nye afɔɖeɖe nyui aɖe si ana dɔwɔƒewo nawɔ mɔ̃ɖaŋununya ƒe tɔtrɔ kabakaba eye woana valvɔ-nuwɔnawo ƒe agbɔsɔsɔme nanyo ɖe edzi. Valvɔ “egbegbe tɔtrɔ etɔ̃” dɔwɔha la wɔa dɔ le “nyui ene” (eƒe zazã le bɔbɔe, etutu le bɔbɔe, edzadzraɖo le bɔbɔe eye wòsɔ nyuie) kple “ɖekawɔwɔ ene” (kpɔɖeŋu, dɔwɔwɔ ƒe nɔnɔmewo, kadodo kple didime bliboa, akpa siwo woɖo ɖi) ƒe gɔmeɖosewo nu. Akpa etɔ̃e le dɔa me koŋ, ɖekae nye be woana ƒomevi siwo wotsɔ ƒo ƒui la nanɔ bɔbɔe; bubue nye be woawɔ mɔ̃ɖaŋununya ƒe dzidzenuwo ƒe hatsotso aɖe ahagbugbɔ wo atrɔ asi le wo ŋu; etɔ̃liae nye be woatia nusiwo wowɔ ahawu wo nu.

4. Mɔ̃ɖaŋununya ŋuti numekuku do dzɔdzɔmeŋutinunya me numekuku ƒe ŋgɔyiyi ɖe ŋgɔ

(1) Dzɔdzɔmeŋutinunya me numekulawo ƒe ƒuƒoƒowo toto vɛ kple dodokpɔwɔƒewo tutu Le ƒe 1969 ƒe nuwuwu la, woɖe Mɔ̃wo Ŋuti Numekuƒe Gã la tso Beijing yi Hefei, eye wogbã mɔ̃ gbãtɔ si wotsɔ doa sisi ƒe tsitretsitsi kpɔ, si gblẽ nu le dzɔdzɔmeŋutinunya me numekukuwo ŋu vevie. Le ƒe 1971 me la, dzɔdzɔmeŋutinunyalawo trɔ gbɔ va ƒuƒoƒoa me ɖe wo nɔewo yome, eye valvɔ ŋuti numekukuwɔƒea dzi ɖe edzi va ɖo ame 30 kple edzivɔ, eye subɔsubɔha la de dɔ asi nɛ be wòawɔ ɖoɖo ɖe mɔ̃ɖaŋununya ŋuti numekuku ŋu. Wotu nudokpɔƒe bɔbɔe aɖe, wode dodokpɔmɔ̃ si te ŋu nɔa te ɖe sisi nu, eye wowɔ nyaƒoɖeamenu, nubablɛ kple dodokpɔmɔ̃ bubu aɖewo koŋ hewɔe, eye wodze mɔ̃ɖaŋununya me numekuku gɔme le valvɔ ƒe nutrenu ƒe anyigba kple nu babla ŋu.

(2) Nu vevi siwo wowɔ Kaifeng Takpekpe si wowɔ le ƒe 1973 me la wɔ mɔ̃ɖaŋu ŋuti numekuku ƒe ɖoɖo na valvɔ dɔwɔƒea tso ƒe 1973 va ɖo ƒe 1975, eye wodo numekuku vevi 39 ƒe susu ɖa. Wo dometɔ 8 nye dzoxɔxɔ ƒe dɔwɔwɔ, nu 16 siwo nye nutrenu ƒe anyigba, nu 6 siwo wotsɔ blaa nu, nu 1 si nye elektrikmɔ̃, kple nu 6 siwo nye dodokpɔ kple dɔwɔwɔ dodokpɔ. Emegbe le Harbin Welding Research Institute, Wuhan Material Protection Research Institute, kple Hefei General Machinery Research Institute la, woɖo dɔwɔla tɔxɛwo be woawɔ ɖoɖo ɖe nuwo me dzodzro edziedzi ŋu ahawɔ ɖoɖo ɖe wo ŋu, eye wowɔ dɔwɔwɔ ƒe takpekpe eve le akpa vevi siwo le high and medium pressure valves ŋu tsɔ ƒo nuteƒekpɔkpɔwo nu ƒu, kpekpeɖeŋunana wo nɔewo kple wo nɔewo ɖɔliɖɔli, eye wowɔ 1976 -Basic parts research plan le ƒe 1980. To agbagbadzedze ɖekae si wowɔ le ƒe 1980 me dɔwɔƒe bliboa, wokpɔ dzidzedze gãwo le mɔ̃ɖaŋu ŋuti numekukudɔwo me, si do dzɔdzɔmeŋutinunya me numekuku ƒe ŋgɔyiyi ɖe ŋgɔ le valvɔ dɔwɔƒea. Nu vevi siwo dona tso emee nye esiawo:

1) Tack le nutrenu ƒe anyigba. Nutrenu ƒe anyigba ŋuti numekukua ƒe taɖodzinue nye be woakpɔ kuxi si nye ememe tsi si le dodom le...ʋuƒoa ƒe ʋuƒoa. Ɣemaɣi la, nutrenu ƒe anyigba koŋue nye 20Cr13 kple 12Cr18Ni9, siwo ƒe sesẽme mede o, womete ŋu nɔa te ɖe vuvu nu o, ememe tsi ƒe sisi ƒe kuxi sesẽwo le valvɔ ƒe nuwɔna me, eye woƒe agbenɔƒe le kpuie. Shenyang Valve Numekuku Dɔwɔƒe, Harbin Welding Numekuku Dɔwɔƒe kple Harbin Boiler Dɔwɔƒe ɖo numekuku ƒuƒoƒo si me wowɔa nu etɔ̃ le. Le ƒe 2 ƒe dɔ sesẽ wɔwɔ megbe la, woto chrome-manganese nutrenu ƒe anyigbadzinu yeye aɖe vɛ (20Cr12Mo8). Nusiwo wotsɔ wɔe la ƒe dɔwɔwɔ nyuie le dɔwɔwɔ ŋu. Tsitretsitsi nyuie na ʋuʋudedi, agbenɔƒe didi, kple nickel kple chromium si mesɔ gbɔ o, nunɔamesiwo ate ŋu anɔ te ɖe aƒeme dzi, le mɔ̃ɖaŋununya ƒe asixɔxɔ dede eŋu megbe la, exɔ asi ŋutɔ na dodo ɖe ŋgɔ.

2) Numekukuwo yɔyɔ fũ. Taɖodzinu si le packing numekukua ŋue nye be woakpɔ kuxi si nye valve leakage gbɔ. Ɣemaɣi la, asbestos si me ami le kple rababa asbestos koŋue nyea valvɔa ƒe babla, eye nutrenu ƒe dɔwɔwɔ menyo o, si na valvɔa me tsi vevie. Le ƒe 1967 me la, Mɔ̃wo Ŋuti Numekuƒe Gãtɔ ɖo gotagome tsi si le dodom ŋuti numekuku ƒuƒoƒo aɖe be woaku nu me le atikewɔƒe aɖewo, amiɖaƒewo kple elektrikdɔwɔƒewo ŋu, eye emegbe wowɔ numekuku vevie be woatsɔ axe mɔ ɖe xɔxlɔ̃ nu le nusiwo wotsɔ blaa nu kple valvɔ ƒe kewo ŋu.

3) Adzɔnuwo ƒe dɔwɔwɔ dodokpɔ kple gɔmedze nukpɔsusu ŋuti numekuku. Esime wonɔ mɔ̃ɖaŋu ŋuti numekuku wɔm la, .valvɔ dɔwɔƒeahã wɔ adzɔnuwo ƒe dɔwɔwɔ dodokpɔ kple nukpɔsusu veviwo ŋuti numekuku vevie, eye wòkpɔ nu geɖe.

5. Wɔ mɔ̃ɖaŋununya ƒe tɔtrɔ le dɔwɔƒewo ŋu

Le Kaifeng Takpekpea megbe le ƒe 1973 me la, dɔwɔƒe bliboa wɔ mɔ̃ɖaŋununya ƒe tɔtrɔ. Kuxi vevi siwo nɔ valvɔdɔwɔƒewo ɣemaɣi: Gbã la, dɔwɔwɔa tsi megbe, wotsɔ asi wɔe keŋkeŋ, wotsɔa nu ɖeka ƒua gbe, eye zi geɖe la, wozãa mɔ̃ siwo wozãna le mɔ gbadza nu kple nusiwo wotsɔ blaa nu le mɔ vovovowo nu tsɔ wɔa dɔ le vuvɔ me. Elabena wogbugbɔna dɔwɔƒe ɖesiaɖe ƒe ƒomeviwo kple eƒe nɔnɔmewo gbugbɔna fũ akpa, eye xexlẽmea sɔ gbɔ le dukɔ bliboa me, gake le dɔwɔƒe ɖesiaɖe mama vɔ megbe la, nusiwo wowɔna ƒe hatsotso la le sue ŋutɔ, si kpɔa ŋusẽ ɖe nuwɔwɔ ƒe ŋutete ƒe dɔwɔwɔ dzi. Le kuxi siwo míeyɔ ɖe etame gbɔ kpɔkpɔ me la, Mɔ̃ɖaŋudɔwɔƒe Gbãtɔ ƒe Dɔwɔƒe si Kpɔa Dɔwɔnyawo Gbɔ ƒe Dɔwɔƒe Gã la do afɔɖeɖe siwo gbɔna: woawɔ ɖoɖo ɖe elektrikŋusẽnamɔ̃ siwo ƒe ʋuʋudedi sesẽ kple esiwo le titina siwo li fifia ŋu, woawɔ ɖoɖo ɖekae, woama dɔwɔlawo me le susu me, eye woakeke nusiwo wowɔna le agbɔsɔsɔ gã me ɖe enu; xɔ mɔ̃ɖaŋununya deŋgɔwo, ɖoa nuwɔƒewo, eye wowɔa nu aduadu le dɔwɔƒe veviwo kple teƒe ƒuƒluwo. Woɖo gakpo ƒuƒlu wɔwɔ ƒe mɔnu 4 ɖe gakpo siwo wotsɔ ƒua gbe ƒe dɔwɔƒea, eye woɖo akpa 10 siwo wotsɔa fafɛ wɔe le dɔwɔƒe vevi ade me; wotsɔ ga si katã nye yuan miliɔn 52 de mɔ̃ɖaŋununya ƒe tɔtrɔ me.

(1) Dzoxɔxɔ ƒe dɔwɔwɔ ƒe mɔ̃ɖaŋununya ƒe tɔtrɔ Le dzoxɔxɔ ŋuti dɔwɔwɔ ƒe mɔ̃ɖaŋununya ƒe tɔtrɔ me la, wova xɔ mɔ̃ɖaŋununya abe tsi ƒe ahuhɔ̃e ƒe ƒutsotsoewo ƒe aŋɔ, ke si me tsi le, ƒutsotsoe ƒe nɔnɔme kple precision casting. Precision casting ate ŋu akpɔ chip-less alo chip-free machining gɔ̃ hã adze sii. Esɔ na agbo, packing gland kple valve ŋutilã kple bonnet of small-diameter valves, kple ganyawo ƒe viɖe siwo dze ƒã. Le ƒe 1969 me la, Shanghai Lianggong Valve Factory zã precision casting mɔnu zi gbãtɔ le valve wɔwɔ me, na PN16, DN50 agbo valve ŋutilã, .

(2) Vuvɔ me dɔwɔwɔ ƒe mɔ̃ɖaŋununya ƒe tɔtrɔ Le vuvɔ me dɔwɔwɔ ƒe mɔ̃ɖaŋununya ƒe tɔtrɔ me la, wozãa mɔ̃ tɔxɛwo kple ewɔwɔ ƒe kawo le valvɔ dɔwɔƒea. Le keke ƒe 1964 me ke la, Shanghai Valve No. 7 Factory wɔ agbo ƒe valvɔ ŋutilã crawler ƒomevi si nye semi-automatic production line, si nye gbãtɔ si ƒe nyaƒoɖeamenu sue valve semi-automatic production line le valve dɔwɔƒea. Emegbe la, Shanghai Valve No. 5 Factory wɔ ɖoɖo eye wòwɔ afã-automatic wɔwɔ fli DN50 ~ DN100 low-nyaƒoɖeamenu globe valve ŋutilã kple bonnet le ƒe 1966 me.

6. To ƒomevi yeyewo vɛ vevie eye nàna ƒuƒoƒo blibowo ƒe agbɔsɔsɔme nanyo ɖe edzi

Be woakpɔ dɔwɔnu blibo gãwo abe ami, atikewɔƒe, elektrikŋusẽ, gaŋutinunya kple amidɔwɔƒe ƒe nuhiahiãwo gbɔ la, valvɔ dɔwɔƒea le nu yeyewo wɔm vevie le mɔ̃ɖaŋununya ƒe tɔtrɔɣi ma ke me, si na valvɔ ƒe nuwɔna ƒe sɔsɔme nyo ɖe edzi.

03 Kpuie ko la

Ne míetrɔ kpɔ megbe le ƒe 1967-1978 me la, ŋgɔyiyi si wowɔ le ƒe 1967-1978 mevalve dɔwɔƒea gblẽ nu le eŋu vevie ɣeaɖeɣi. Le ami, atike, elektrikŋusẽ, gaŋutinunya kple dzotsidɔwɔƒewo ƒe ŋgɔyiyi kabakaba ta la, nyaƒoɖeamenu gã kple titina ƒe ʋuƒo va zu “nu siwo wowɔna ɣeyiɣi kpui aɖe” hena ɣeyiɣi aɖe. Le ƒe 1972 me la, valvɔ dɔwɔƒewo ƒe habɔbɔa gadze dɔwo gɔme ake hewɔ wo. Le Kaifeng takpekpe eveawo megbe la, wowɔ “egbegbe tɔtrɔ etɔ̃” kple mɔ̃ɖaŋu ŋuti numekukudɔ vevie, si he mɔ̃ɖaŋununya ƒe tɔtrɔ ƒe ƒutsotsoe aɖe vɛ le dɔwɔƒe bliboa me. Le ƒe 1975 me la, valvɔ-dɔwɔƒewo dze ɖɔɖɔɖo gɔme, eye dɔwɔƒea ƒe nuwɔwɔ va nyo wu.

Le ƒe 1973 me la, Dukɔa ƒe Ðoɖowɔha da asi ɖe xɔtuɖoɖowo dzi be woatsɔ adzi nyaƒoɖeamenu gã kple esiwo le titina ƒe wɔwɔ ɖe edzivalvɔwo ƒe ʋuƒo. Le gadede asi megbe la, valvɔ dɔwɔƒea wɔ tɔtrɔ si ate ŋu adzɔ. To mɔ̃ɖaŋununya ƒe tɔtrɔ kple dodo ɖe ŋgɔ me la, woxɔ mɔ̃ɖaŋununya deŋgɔ aɖewo, ale be wona alesi wowɔa dɔ le vuvɔ me le dɔwɔƒe bliboa me la nyo ɖe edzi va ɖo afi aɖe, eye wona dzoxɔxɔ ƒe dɔwɔwɔ ƒe mɔ̃wo ƒe agbɔsɔsɔme nyo ɖe edzi va ɖo afi aɖe. Esi wodo plasma spray welding ƒe mɔnu ɖe ​​ŋgɔ vɔ la, woganyo ɖe edzi ŋutɔ le nusiwo wowɔ ƒe nyonyome si le ʋuƒo siwo ƒe nyaƒoɖeamenu sesẽ kple esiwo le titina me ŋu, eye woganyo ɖe edzi le kuxi si nye “tsi sisi kpui ɖeka kple eve ƒe sisi” hã ŋu. Esi wowu xɔtuɖaŋu ƒe afɔɖeɖe 32 nu eye wole dɔ wɔm ta la, gɔmeɖoanyi sesẽ wu le China ƒe valvɔ dɔwɔƒea si eye eƒe nuwɔwɔ ƒe ŋutete lolo wu. Tso ƒe 1970 me la, nusiwo dona tso mɔ̃ siwo ƒe nyaƒoɖeamenu gã kple esiwo le titina me yi edzi le dzidzim ɖe edzi. Tso ƒe 1972 va ɖo ƒe 1975 me la, nusiwo wowɔna dzi ɖe edzi tso 21,284t va ɖo 38,500t, kple dzidziɖedzi ŋutɔŋutɔ si nye 17,216t le ƒe 4 me, si sɔ kple ƒe sia ƒe ƒe dɔwɔwɔ le ƒe 1970. Ƒe sia ƒe ƒe nusiwo dona tso valvɔ siwo ƒe nyaƒoɖeamenu suewo me la li ke le tɔn 70,000 va ɖo 80,000 ƒe seƒe. Le ɣeyiɣi sia me la, .ʋuƒoa ƒe ʋuƒoa dɔwɔƒewo to nu yeyewo vɛ vevie, menye valvɔ vovovo siwo wozãna le mɔ gbadza nu koe woto vɛ ŋutɔ o, ke boŋ valvɔ tɔxɛ siwo wozãna na elektrikdɔwɔƒewo, pɔmpiwo, nyaƒoɖeamenu si nu sẽ ŋutɔ, dzoxɔxɔ si bɔbɔ kple nuklia dɔwɔƒewo, yamenutome kple valvɔ bubu siwo wozãna na taɖodzinu tɔxɛwo hã to vɛ ŋutɔ. Ne ƒe 1960-awo nye ɣeyiɣi si me wowɔ ŋgɔyiyi gã aɖe le valvɔ siwo wozãna na nusianu ŋu la, ekema ƒe 1970-awo nye ɣeyiɣi si me wowɔ valvɔ siwo wozãna na dɔ tɔxɛwo ŋutɔ. Aƒemetɔwo ƒe kpekpeɖeŋunana ƒe ŋutetevalvɔwo ƒe ʋuƒo wowɔe wònyo ɖe edzi ŋutɔ, si koŋ kpɔa dukɔa ƒe ganyawo ƒe akpa vovovowo ƒe ŋgɔyiyi ƒe nuhiahiãwo gbɔ.