Abstract: A diaphragm valve is described, which has a valve body having disposed within it an upper chamber and a lower chamber. The valve body also has first and second connection members that extend from the valve body at substantially a right angle, and where the connection members are hollow and in fluid communication with the upper chamber of the valve body. The valve comprises: an entrance for admitting a fluid, an exit for passage of the fluid when the fluid is flowing, a draining port for draining of the fluid from the valve, and a passage between the entrance, the exit, and the draining port; wherein the passage is shaped to permit complete draining of the fluid from the valve under force of gravity when the draining port is open.