Ka lebaka la khetho ea thepa ea ho tiisa ke EPDM kapa NBR.Belofo e bonolo ea heke e ka sebelisoa ka mocheso o phahameng oa 80 ° C.Hangata e sebelisoa liphaepheng tsa ho hloekisa metsi bakeng sa metsi le litšila tsa metsi.Li-valve tsa heke tse koalang tse bonolo li fumaneha ka maemo a fapaneng a moralo, joalo ka British Standard, German Standard, American Standard.Khatello ea lebitso la valve e bonolo ea heke ke PN10,PN16 kapa Class150.