| 摘要 |
<p>A sprinkler drain and test valve for testing sprinkler systems including a housing, an inlet and outlet disposed on either end of the housing, a ball disposed within the housing between the inlet and the outlet having three channels extending therethrough that provide communication between the inlet and outlet. A pressure relief valve is carried within one of the channels for opening the flow through the valve when a pressure from fluid flow exceeds a predetermined pressure when the valve is in the first position and for blocking fluid flow when the valve is in a hydrostatic test angular position.</p> |
