此閥為各系統(tǒng)儀表安裝的專用產(chǎn)品，閥門打開，進(jìn)氣口與出氣口接通，排氣口關(guān)閉。當(dāng)手輪旋轉(zhuǎn)90°，進(jìn)氣口與出氣口切斷，出氣口與排氣口接通，排出測(cè)量儀表氣體。 It is a special product of various gauge installions. While the vavle opening,the admissior is connected with the oatlet and exhaust is closed when the handle is turned 90°,the admission abd outlet are cut off but the outlet is connected with the exhaust and the gauge gas is exhauster.
