Patent ID: 7219683

Claim:
A cut valve with a check valve, the cut valve comprising: a body case that defines a vent hole and accommodates therein a float valve for opening and closing the vent hole; a cap member that is fitted to an upper portion of the body case and includes a connection pipe communicating with the vent hole and protruding from an outer wall thereof; a positive pressure valve that comprises resin, defines an opening part, and is disposed to be contactable with and separable from the vent hole from above; a first spring that is disposed on the positive pressure valve and presses the positive pressure valve in a direction in which the positive pressure valve closes the vent hole; a negative pressure valve that comprises resin and is disposed to be contactable with and separable from the opening part of the positive pressure valve from below; a second spring that presses the negative pressure valve in a direction in which the negative pressure valve closes the opening part of the positive pressure valve; and a lid that receives the first spring, wherein: the body case includes a cylindrical tube portion that is erected on an upper surface of the body case to surround the vent hole; the positive and negative pressure valves are accommodated in the tube portion; and the lid is attached to an upper end of the tube portion.