Whether you need the simplicity of a basic valve or the flexibility of added features, the Sentinel Series is your solution. Choose from two models, plus different options and accessories to fit the level of adjustment and controls you need.

For the most dependable draining, install the Van Air Sentinel Series motorized ball valve. The Sentinel's heavy-duty ball valve can manage virtually any fluid in a wide variety of applications. Depend on it for nearly any fluid service.

MDV-400I
For dependable draining at consistent intervals choose Sentinel model MDV-400I. A power-on LED and test button are conveniently located on the top cover. To reset the valve, simply adjust the switches on the internal circuit board. Adjustable intervals between valve actuations are 30 minutes to 30 hours. Adjustable draining periods are 5, 10, 15 and 20 seconds.

MDV-400L
If you prefer an easy-to-use keypad for convenient cycle timing adjustments and a handy LCD cycle status readout, choose Sentinel model MDV-400L. You'll never wonder when it's set to actuate again with its continuous, clear countdown display of remaining cycle or drain open times. Added features include an external test and valve fault functions, both with LCD readout. Adjustable intervals between valve actuations are 1 minute to 99 hours 59 minutes. Adjustable draining periods are 1 second to 99 minutes 59 seconds.