A Valavu ya Mpira Yoyendetsedwa ndi Pneumaticndi imodzi mwa ma valavu odziyimira pawokha omwe amagwiritsidwa ntchito kwambiri m'makina oyendetsera madzi a mafakitale. Imaphatikiza valavu ya mpira ngati chinthu chowongolera kuyenda kwa madzi ndi chowongolera mpweya ngati mphamvu yoyendetsera. Kumvetsetsa momwe imagwirira ntchito ndikofunikira kuti mainjiniya ndi magulu okonza zinthu asankhe, kukhazikitsa, ndikuthetsa mavuto a zidazi bwino.
Munkhaniyi, tikufotokoza zinthu monga momwe zimagwirira ntchito, mfundo zogwirira ntchito, komanso ubwino weniweni wa ma valve a mpira oyendetsedwa ndi mpweya pogwiritsa ntchito deta ya m'munda ndi miyezo yamakampani (ISA 75.02, ISO 5211). Mosiyana ndi mafotokozedwe wamba apaintaneti, bukuli likuphatikizapo njira zolephera zomwe zimawonedwa m'malo opitilira 200 m'malo opangira mankhwala, madzi, ndi mafakitale opangira chakudya.
Kodi aValavu ya Mpira Yoyendetsedwa ndi Pneumatic
A Vavu ya Mpira wa Pneumaticndi valavu yomwe imagwiritsa ntchito chowongolera mpweya kuti ilamulire kutsegula ndi kutseka kwa valavu ya mpira. Vavu ya mpira yokha imakhala ndi diski yozungulira (mpira) yokhala ndi dzenje pakati pa mpira. Vavu ikatsegulidwa, dzenjelo limagwirizana ndi njira yoyendetsera madzi, zomwe zimathandiza kuti madzi kapena mpweya zidutse. Ikatsekedwa, mpirawo umazungulira kuti utseke kuyenda kwa madzi, zomwe zimapangitsa kuti valavuyo ikhale yolimba.
Choyatsira mpweya chopondereza mpweya ndi chipangizo chomwe chimasintha mpweya woponderezedwa kukhala kayendedwe ka makina. Nthawi zambiri chimakhala ndi silinda, pisitoni, ndi ndodo yolumikizira. Mpweya ukaperekedwa ku choyatsira mpweya, umakankhira pisitoni, yomwe imazungulira valavu ya mpira kupita pamalo omwe mukufuna.
Zigawo Zofunika Kwambiri za Valve ya Mpira Yoyendetsedwa ndi Pneumatic
Valavu ya mpira yoyendetsedwa ndi pneumatic imakhala ndi zigawo zazikulu izi:
→Valavu ya mpira: Chigawo chachikulu chomwe chimayendetsa kayendedwe ka madzi. Ma valve a mpira amatha kupangidwa ndi zinthu zosiyanasiyana, kuphatikizapo chitsulo chosapanga dzimbiri (CF8M, CF3M), pulasitiki (PVC, CPVC), kapena mkuwa, kutengera momwe amagwiritsidwira ntchito. Mu kafukufuku wathu wamkati wa 2025, mitundu yachitsulo chosapanga dzimbiri inali 68% ya mankhwala ogwiritsidwa ntchito kwambiri chifukwa cha kukana dzimbiri.
→ Choyendetsa pneumatic: Amasintha mphamvu ya mpweya wopanikizika kukhala mphamvu yamakina. Ma actuator ambiri ogwirira ntchito kawiri amafuna mphamvu ya mpweya kuti atsegule ndi kutseka valavu, pomwe ma actuator obwerera m'mbuyo amagwiritsa ntchito mpweya kutsegula ndi kasupe kuti atseke (osatetezeka). Kukula kwa actuator (monga ISO 5211 F05/F07) kuyenera kufanana ndi mphamvu ya breakaway ya valavu ya mpira - kusagwirizana kumeneku kunayambitsa 23% ya kulephera kwamunda komwe tidalemba.
→ Valavu ya Solenoid: Valavu yowongolera yoyendetsedwa ndi magetsi yomwe imatsogolera mpweya wopanikizika kupita kumadoko a actuator. Pa makina ofunikira kwambiri pachitetezo, tikupangira valavu ya solenoid ya 5/2 way yokhala ndi override yamanja.
→ Zosintha za Positioner & Limit(ngati mukufuna koma ndikulimbikitsidwa): Choyimitsa chimatsimikizira kuti mphamvu ya throttling ndi yolondola (±1% yolondola), pomwe ma switch oletsa amapereka mayankho otseguka/otsekedwa patali. Mu 2024, kasitomala (fakitale yoyeretsera madzi ku Singapore), kuwonjezera choyimitsa chanzeru kunachepetsa nthawi yozungulira kuchoka pa 0.5s kufika pa 0.07s.
Kodi Valavu ya Mpira wa Pneumatic Imagwira Ntchito Bwanji?
Mfundo Yogwirira Ntchito (Gawo ndi Gawo)
TheMfundo yogwirira ntchito ya valavu ya mpira yoyendetsedwa ndi mpweya ndi yosavuta koma imafuna kulumikizidwa kolondola. Nayi njira yogwirira ntchito pang'onopang'ono:
1.Kulumikiza kwa mpweyaMpweya wopanikizika (nthawi zambiri umakhala ndi mipiringidzo 4‑8, wosefedwa ndi kudzozedwa) umalumikizidwa ku doko lolowera la actuator ya pneumatic. Mpweya wodetsedwa ndiye chifukwa chachikulu cha kulephera kwa chisindikizo msanga - gwiritsani ntchito fyuluta ya 5μm.
2. Chizindikiro ku valavu ya solenoid: Dongosolo lowongolera (PLC/DCS) limatumiza chizindikiro chamagetsi (monga, 24V DC) ku valavu ya solenoid.
3. Kusintha kwa kayendedwe ka mpweya: Valavu ya solenoid imatsogolera mpweya wopanikizika mbali imodzi ya actuator pamene ikutulutsa mpweya mbali inayo.
4. Kuyenda kwa rack ndi pinion / scotch yopingasa:
• Mu choyatsira cha rack ndi pinion, mpweya umakankhira ma pistoni awiri molunjika, kutembenuza pinion ndi tsinde la valavu.
• Mu actuator ya scotch-yoke (yogwiritsidwa ntchito pa ma valve akuluakulu kapena okwera kwambiri), mpweya umasuntha pisitoni yomwe imazungulira goli, kusintha kuyenda kolunjika kukhala kozungulira.
5. Kuzungulira mpira: Chitsinde cha valavu chimazungulira mpira (nthawi zambiri 90° kuyambira wotseguka kwathunthu mpaka wotsekedwa kwathunthu). Mpirawo uli ndi chibowo chozungulira - pamene chibowo chikugwirizana ndi payipi, valavu imatsegulidwa; ikazunguliridwa 90°, nkhope yolimba ya mpirayo imatseka kuyenda.
6. Kutseka: Mipando yofewa (PTFE, TFM, kapena Devlon) kapena mipando yachitsulo imakanikiza mpirawo kuti utsike bwino. Pa kutentha kwambiri (>200°C), ma valve a mpira okhala ndi chitsulo okhala ndi graphite packing amafunika - PTFE imalowa ndikutuluka madzi.
Chitsanzo chenicheni:Mu dongosolo la CIP (loyera pamalo pake) la chomera cha mkaka, valavu ya mpira yoyendetsedwa ndi chitsulo chosapanga dzimbiri yokhala ndi makina obwezeretsanso masika nthawi 15-20 pa ola limodzi. Pambuyo pa ma cycle 500,000, tinayesa kutuluka kwa mpando <0.01% ya mphamvu yovomerezeka - yoposa ANSI/FCI 70-2 Class VI.
Ubwino wa Ma Valves a Mpira Oyendetsedwa ndi Pneumatic
Poyerekeza ndi ma valve amagetsi kapena amanja, ma valve a mpira oyendetsedwa ndi pneumatic amapereka maubwino osiyanasiyana pamafakitale:
1. Hmoyo wa kuzungulira kwakukulu ndi kuyankha mwachangu
Ma actuator a pneumatic amatha kuzungulira sekondi iliyonse ya 0.5-1, pomwe ma actuator amagetsi amatenga masekondi 2-10. Mu mizere yodzaza mofulumira kwambiri, liwiro ili limachepetsa zinyalala ndi 12% (kutengera deta ya mafakitale atatu opaka).
2. Ntchito yoteteza kuphulika
Palibe magetsi oyaka mkati mwa actuator - ndi abwino kwambiri m'malo oopsa (Zone 1/2, Class I Div 1). Palibe chifukwa chosungira zinthu zodula zomwe sizingaphulike.
3. Kulephera kuchita zinthu mopanda vuto
Ma actuator obweza masika amasuntha valavu yokha kupita pamalo otetezeka (otseguka kapena otsekedwa) mpweya kapena mphamvu ikatayika. Ichi ndi chofunikira chofunikira m'makina ambiri otetezera (SIL 2/3).
4. Kukonza kochepa komanso moyo wautali wautumiki
Ndi mpweya wouma woyera komanso mafuta oyenera (monga mafuta a NLGI #2), zotsekera za actuator zimatha maulendo 1-2 miliyoni. Mipando yofewa ya valavu ya mpira nthawi zambiri imafunika kusinthidwa pambuyo pa maulendo 250,000-500,000 kutengera kuuma kwa media.
5. Mphamvu yotulutsa mphamvu zambiri pa ma valve akuluakulu
Chojambulira cha scotch-yoke chingapange mphamvu yoposa 10,000 Nm - yokwanira ma valve a mpira a mainchesi 24 pa kutsika kwa mphamvu ya bar 100. Ma actuator amagetsi okhala ndi mphamvu yofanana angakhale akulu kawiri komanso okwera mtengo kwambiri.
Chidule cha phunziro la nkhani:Kampani ina ya mankhwala ku Texas inasintha ma valve 32 amagetsi ndi ma valve oyendetsedwa ndi mpweya. Kwa miyezi 18, iwo anati:
• Kuchepa kwa 67% kwa nthawi yopuma yokhudzana ndi ma valve
• 41% yotsika mtengo wokonza pa valavu iliyonse
• Palibe kulephera kwa malo komwe kumakhudzana ndi kuyambitsa kwa actuator
Mapeto
Valavu ya mpira yoyendetsedwa ndi mpweya imagwira ntchito posintha mpweya wopanikizika kukhala wozungulira, womwe umatembenuza mpira kuti uyambe kapena kuyimitsa kuyenda kwake. Kuyankha kwake mwachangu, chitetezo chake pa kuphulika, komanso kapangidwe kake kosalephera kumapangitsa kuti ikhale chisankho chabwino kwambiri m'mafakitale amafuta ndi gasi, kukonza madzi, chakudya ndi zakumwa, komanso mankhwala.
Musanatchule valavu ya mpira yoyendetsedwa ndi pneumatic ya dongosolo lanu, nthawi zonse onetsetsani kuti:
• Mphamvu yofunikira (yotsegula/kutseka) poyerekeza ndi mphamvu yotulutsa ya actuator
• Ubwino wa mpweya (ISO 8573‑1 Class 4.4.3 osachepera)
• Njira yotetezeka (mpweya woti utsegulidwe kapena mpweya woti utseke)
Kuti muwerenge zambiri, onani:
• ISA‑75.02.01 – Kukula kwa Actuator ya Valve Yowongolera
• ISO 5211 – Ma valve a mafakitale – Cholumikizira cha actuator chozungulira mbali
• Lipoti la mayeso amkati a NSW Valves (2025):Moyo wa Valavu ya Mpira wa Pneumatic Pansi pa Mikhalidwe Yovuta- imapezeka ngati mupempha.
Yasinthidwa komaliza: June 2, 2026. Yawunikidwa ndi gulu la mainjiniya la NSW Valves.
Nthawi yotumizira: Feb-13-2025