A circuit may be configured to reduce voltage dip or overshoot that can occur on power supply lines when current loads are turned on or off more quickly than a power supply can respond. The valve includes a valve housing, a valve closure member, and a valve seat. Further, a discharge space is formed at a downstream position of the water wheel chamber so as to be in communication with the fluid outlet port, to which fluid after having rotated the water wheel is ejected and a stagnation preventing protrusion part is formed in the discharge space to facilitate flow of air bubbles to the fluid outlet port. Impregnation of the relatively lightweight radiopaque material can be performed in a number of ways, including soaking the fabric in a solution containing the relatively lightweight radiopaque material or using the fabric as a filter in a passing solution of the lightweight radiopaque material.