| 主权项 |
1. A rigid piston assembly for use in a flush valve, the flush valve having a valve body with a fluid inlet, a fluid outlet, an outer cover, and a handle member, the rigid piston assembly comprising:
a rigid piston having a central opening and a by-pass orifice, wherein the rigid piston is mounted within the valve body and is adapted to move axially in the direction of the flow of water from the fluid inlet to the fluid outlet; a relief valve positioned through the central opening of the rigid piston, the relief valve comprising an auxiliary valve and a shaft extending from the auxiliary valve; a top closure configured to connect to the valve body at an end opposite the fluid outlet; a piston seal adapted to fixedly engage to the rigid piston and sealingly engage to the valve body near an entrance of the fluid outlet, the piston seal having a by-pass orifice; a by-pass device having a body with a first end, a second end, and a passageway positioned through the body, wherein the by-pass device is adapted to fit inside the by-pass orifices of the rigid piston and the piston seal, thereby establishing fluid communication between the fluid inlet and an upper chamber formed between the rigid piston and the top closure; and a retaining ring adapted to fixedly engage to the piston seal, wherein the retaining ring comprises a by-pass orifice and the by-pass device is adapted to fit inside the by-pass orifice of the retaining ring. |
