| 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; a cap having a hollow stem that extends from a central opening in the cap, the cap configured to connect to the valve body at an end opposite the fluid outlet; a fitting having a first end and a second end, the first end of the fitting configured to fixedly connect to the cap; a solenoid adapted to connect to the second end of the fitting, and a piston seal adapted to fixedly engage to the rigid piston, wherein the piston seal comprises: (a) a central opening for receiving the rigid piston; (b) a central sealing ring extending out from and surrounding an edge of the central opening, the central sealing ring configured to form a seal with the fluid outlet of the flush valve; (c) a by-pass orifice; and (d) an annular skirt surrounding an outer edge of the piston seal and which is adapted to expand out toward the cap connected to the valve body and form a seal with the cap,wherein the piston seal is formed from a single rubber article. |
