Ma valve oponya ndi ma valve opangidwa ndi kuponyera.Kawirikawiri, kupanikizika kwa ma valve oponyedwa ndi otsika kwambiri (monga PN16, PN25, PN40, koma palinso othamanga kwambiri, omwe amatha kufika ku 1500Lb, 2500Lb), ndipo ma calibers awo ambiri ali pamwamba pa DN50.Mavavu opangidwa mwachinyengo amapangidwa ndipo nthawi zambiri amakhala ...
Werengani zambiri