THREE-WAY SELECTOR VALVE

摘要

PROBLEM TO BE SOLVED: To provide a three-way selector valve which speeds up the switch-over of a flow pass and achieves highly accurate calibration serving long and inexpensive with less vibration and impact.SOLUTION: A three-way selector valve 1 includes: an inlet port 2 connected to a gas standard flow meter and taking a gas from the gas standard flow meter; a discharge port 3 for discharging the gas taken from the inlet port 2; a constant-volume tank connection port 4 connected to a constant-volume tank and supplying the gas taken from the inlet port 2 to the constant-volume tank; a first air cylinder 7a for performing opening/closing of the discharge port 3; and a second air cylinder 7b for performing opening/closing of the constant volume tank connection port 4. Independently performing the opening/closing of the first air cylinder 7a and the second air cylinder 7b allows the flow pass from the inlet port 2 to the discharge port 3 and the flow pass from the inlet port 2 to the constant volume tank connection port 4 to be switched-over.