| 摘要 |
A liquid flow sensing device which comprises a weight sensitive control means movable between first and second positions though biassed towards the first position. A first valve section is provided which is movable in response to movement of the control means while a second valve section is fixed in relation to the first section. First and second ports are provided with either of the first and second sections and a third valve section is located in a cooperating relationship with said first and second sections. The third valve section has means for providing communication between the first and second ports and is movable independently of the first and second sections so that the first and second ports are isolated when the control means is in said first position and moves to the second position. Means are provided for coupling said first and third valve sections whereby as the control means reverts to the first position the first and second ports are connected. |
