| 摘要 |
PURPOSE:To prevent the radiation of heat from the bath heater by a method wherein the captioned check valve is provided in a sucking port under the bath heater. CONSTITUTION:A stop groove 6 is provided in the wall of a cylindrical insert 4 which is connected to one side of a valve box and which is removable by inserted into a lower circulation pipe of the bath heater. In this case, the upper portion 3 of the valve box is made longer than the lower part 2 thereof and the check valve 1 is attached aslant to the side of the valve box opposite the side to which the cylindrical insert 4 is connected, through a pin 10 in such a manner that the valve 1 opens only in the direction of the arrow 9. Further, projections 7 are provided on the inner wall of the sucking port of the lower circulation pipe so that when the cylindrical insert 4 is fitted in the sucking port, the projections 7 engage the stop groove 6. |
