Evaporative Check Valve

TWO-WAY VALVE:
Open VACUUM 5 to 15 mmHg (.2 to .6 in.Hg)
Open PRESSURE 10 to 35 mmHg (0.4 to 1.4 in.Hg)
Two-Way Valve Stabilizing Pressures:
Vacuum should stabilize momentarily at 0.2 to 0.6 in Hg (5 to 15 mmHg)
Pressure should stabilize at 0.4 to 1.4 in Hg (10 to 35 mmHg.)