Patent ID: 8490646
Filing Date: 2013-07-23
Classification: E03D,F16K,Y10T

Abstract:
1. A flush valve for a waste water system, comprising: a valve comprising a fluid inlet, a fluid outlet and a main valve element extending between the fluid inlet and the fluid outlet, the main valve element adapted for movement to allow fluid flow between the fluid inlet and the fluid outlet based on a pressure differential across a portion of the main valve element; a vent system comprising a control chamber in flow communication with the fluid inlet of the valve, a vent chamber in flow communication with the control chamber through a vent inlet passage extending between the control chamber and the vent chamber, and a vent outlet passage extending between and in flow communication with the fluid outlet and the vent chamber; a solenoid having a piston configured to open to establish flow communication between the control chamber and the vent outlet passage, thereby venting fluid from the control chamber to the fluid outlet and establishing a pressure differential across a portion of the main valve element and permitting the main valve element to open for fluid flow between the fluid inlet and fluid outlet of the valve, and to close to prevent fluid communication between the control chamber and the vent outlet passage to close the main valve element; a bleed fitting having a first end connected to the valve and a second end connected to the solenoid such that the piston of the solenoid moves into and out of the bleed fitting; and a relief system incorporated into the bleed fitting comprising a relief chamber having a relief inlet in flow communication with the control chamber, a relief outlet in flow communication with the vent outlet passage, and a mechanical relief device positioned completely within the bleed fitting and 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, wherein at least the vent outlet passage and the vent inlet passage of the vent system and the relief system are positioned within the bleed fitting and the vent outlet passage, the vent inlet passage, and the relief chamber are positioned parallel to each other and the relief outlet is positioned perpendicularly to the relief chamber and the vent outlet passage.