Evaporative Check Valve

TWO-WAY VALVE OPENS AT:
Vacuum 5 - 15 mmHg (0.2 - 0.6 in.Hg)
Pressure 10 - 35 mmHg (0.4 - 1.4 in.Hg)

Two-Way Valve Stabilizing Pressures:
Vacuum should stabilize momentarily at 5 - 15 mmHg (0.2 - 0.6 in Hg)
Pressure should stabilize at 10 - 35 mmHg (0.4 - 1.4 in Hg).