The Test and Drain valve merges in one valve the following two functions of testing and draining the system. See below.
- A test connection not less than 1 in diameter terminating a smooth bore corrosion resistant orifice given a flow equivalent to one sprinkler of a type having the smallest orifice installed on the particular system shall be provided to test each waterflow alarm device for each system. The test connection valve shall be readily accessible. The discharge shall be to the outside to a drain connection capable of accepting full flow under system pressure or to another location where water damage willl not result.
- All sprinkler pipes and fittings shall be so installed that the system may be drained. Three positions OFF - TEST - DRAIN. These valves have a green indicator to see their open or closed position from 50 ft distance.