Valve for testing and draining sprinkler systems

In a valve for testing and draining sprinkler systems comprising:

• a valve body consisting of an inlet half-body with an inlet channel and an outlet half-body with an outlet channel which define an open first chamber for housing a ball shutter, whereby said first chamber is in a permanent fluid communication with said inlet channel;
• a ball shutter rotatably housed within said first chamber and provided with a through channel having two end openings with different diameters, namely a smaller opening for a test function and a bigger opening for a drain function on opposite first and second flattenings, and a third flattening having an axis which is at right angle to said through channel and defines an inlet opening of a joining channel which opens out into said through channel;
• a control lever controlling, through a control stem, said shutter in three presettable positions, namely a closure position, a drainage position, and a test position, respectively;
• and
• observation windows for the visual detection of a flowing flow;
• the improvement wherein:
• i) the shutter is supported at one side in the outlet channel by an annular gasket and at the other side by a springing insert which is housed in said inlet half-body of the valve;
• said springing insert being engaged, with a guiding action, onto said ball shutter, and exerting onto said shutter a substantially axial elastic thrust in a direction towards the outlet channel of the valve;
• ii) the springing insert is provided with openings having edges which cause turbulences in the flowing flow, thereby facilitating the visual detection of said flowing flow through the observation windows.