| 摘要 |
A flush valve for a waste water system includes a valve body and a vent system. The valve includes a fluid inlet, a fluid outlet and a main valve element extending therebetween and adapted for movement to allow fluid flow therethrough based on a pressure differential across a portion of the main valve element. The vent system includes a control chamber, in flow communication with the fluid inlet of the valve and a vent outlet in flow communication with the fluid outlet of the valve. The flush valve further includes a relief system including a relief chamber with a relief inlet in flow communication with the control chamber and a relief outlet in flow communication with the vent outlet. A mechanical relief device is configured to open and close the relief inlet based on a predetermined fluid pressure at the relief inlet, thereby venting fluid from the control chamber to the vent outlet. The flush valve may further include a solenoid having a piston configured to open to establish flow communication between the control chamber and the vent outlet to effect opening of the main valve element, and to close to prevent fluid communication between the control chamber and the vent outlet to close the main valve element.
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