Valavu ya mpira wa pulasitiki inachokera ku valavu yolumikizira. Gawo lake lotsegulira ndi kutseka ndi mpira, womwe umagwiritsa ntchito mpirawo kuzungulira madigiri 90 mozungulira mzere wa tsinde la valavu kuti ukwaniritse cholinga chotsegulira ndi kutseka. Valavu ya mpira wa pulasitiki ndi yoyenera kuletsa njira yonyamulira ndi zinthu zowononga. Malinga ndi zipangizo zosiyanasiyana, kutentha kogwira ntchito ndi PVC 0℃ ~ 50℃, C-PVC0℃～90℃, PP -20℃～100℃, PVDF -20℃～100℃. Valavu ya mpira wa pulasitiki ili ndi kukana dzimbiri kwabwino kwambiri. Mphete yotsekera imagwiritsa ntchito EPDM ndi FKM; ili ndi kukana dzimbiri kwabwino kwambiri ndipo imawonjezera moyo wa ntchito. Kusinthasintha kosinthasintha komanso kosavuta kugwiritsa ntchito. Valavu ya mpira wa pulasitiki Valavu ya mpira wofunikira ili ndi malo ochepa otayikira, mphamvu yayikulu, ndipo valavu ya mpira wamtundu wolumikizira ndi yosavuta kusonkhanitsa ndikuchotsa.

Valavu ya mpira wa pulasitiki si yophweka kokha pa kapangidwe kake, ndi yabwino pakutseka, komanso ndi yaying'ono kukula kwake, yopepuka kulemera kwake, yogwiritsidwa ntchito pang'ono, yaying'ono kukula kwake, komanso yaying'ono pa torque yoyendetsa mkati mwa mulifupi mwake. Ndi yosavuta kugwiritsa ntchito ndipo ndi yosavuta kutsegula ndi kutseka mwachangu. Ndi imodzi mwa mitundu ya mavavu yomwe ikukula mwachangu kwambiri m'zaka khumi zapitazi. Makamaka m'maiko otukuka monga United States, Japan, Germany, France, Italy, West, ndi Britain, kugwiritsa ntchito mavavu a mpira ndi kwakukulu kwambiri, ndipo mitundu ndi kuchuluka komwe kumagwiritsidwa ntchito kukukulirakulirabe.

Mfundo yogwirira ntchito ya valavu ya pulasitiki ndikutsegula valavu kapena kutsekereza pozungulira tsinde la valavu. Chosinthiracho ndi chonyamulika, chaching'ono, chodalirika pakutseka, chosavuta kupanga komanso chosavuta kukonza. Malo otsekereza ndi pamwamba pa buluku nthawi zambiri amakhala otsekedwa ndipo sawonongeka mosavuta ndi cholumikiziracho. Chimagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana.

Valavu ya mpira ndi mtundu watsopano wavalavuyomwe yakhala ikugwiritsidwa ntchito kwambiri m'zaka zaposachedwa. Ili ndi ubwino wotsatira:

1. Kukana kwa madzimadzi ndi kochepa, ndipo mphamvu yake yokana ndi yofanana ndi gawo la chitoliro cha kutalika komweko.

2. Kapangidwe kosavuta, kakang'ono kukula ndi kulemera kopepuka.

3. Ndi yolimba komanso yodalirika. Pakadali pano, zinthu zotsekera pamwamba pa valavu ya mpira zimagwiritsidwa ntchito kwambiri mu mapulasitiki omwe amagwira ntchito bwino potsekera, ndipo yagwiritsidwanso ntchito kwambiri mu makina oyeretsera mpweya.

4. Kugwiritsa ntchito kosavuta, kutsegula ndi kutseka mwachangu, kumangofunika kuzungulira 90° kuchokera potseguka kwathunthu mpaka potseka kwathunthu, zomwe ndizosavuta kugwiritsa ntchito patali.

5. Kukonza kosavuta, kapangidwe kosavuta kavalavu ya mpira, mphete yotsekera nthawi zambiri imakhala yosunthika, ndi yosavuta kuichotsa ndikuyiyika m'malo mwake.

6. Ikatsegulidwa kapena kutsekedwa kwathunthu, pamwamba pa mpira ndi mpando wa valavu zimachotsedwa pa sing'anga, ndipo sing'angayo sidzayambitsa kuwonongeka kwa pamwamba pa sing'angayo ikadutsa.

7. Ili ndi ntchito zosiyanasiyana, kuyambira mamilimita angapo mpaka mamita angapo, ndipo ingagwiritsidwe ntchito kuyambira pa vacuum yambiri mpaka pa kuthamanga kwambiri.