Device for collecting air accumulated in pipe

A device for collecting air in a pipe, the device being installed at one side of the pipe, the device comprising:

• a collecting pipe provided at the one side of the pipe to collect air in the pipe;
• a diaphragm check valve provided at an end of the collecting pipe and configured to operate as a pressure balance is broken by an air layer existing in the pipe, the diaphragm check valve including at least one hole near an edge of the diaphragm check valve, wherein the diaphragm check valve is provided between an inner wall of the pipe and an outer wall of the pipe by penetrating the inner wall and the outer wall of the pipe;
• and
• a collected air storing unit configured to store the air coming through the diaphragm check valve and the collecting pipe;
• wherein the collecting pipe has a first section with a first diameter and a second section with a second diameter, the first section being nearest the side of the pipe and the first diameter being smaller than the second diameter, and
• wherein the diaphragm check valve includes a plurality of holes positioned between a projection of the first diameter onto the diaphragm and a projection of the second diameter onto the diaphragm.