Diaphragm valve controlled through electronic pressure detection and method

In a method for operating a flush valve in a waste water system, the flush valve having a fluid inlet;

• a fluid outlet;
• a 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;
• and a vent system for venting fluid from the fluid inlet to the fluid outlet to establish a pressure differential across a portion of the main valve element to cause the main valve element to open, the vent system having a control chamber in flow communication with the fluid inlet of the valve, a vent outlet in flow communication with the fluid outlet of the valve, and an electronically operated solenoid adapted to control fluid flow from the control chamber to the vent outlet to selectively vent fluid from the control chamber to the fluid outlet, the improvement comprising monitoring the static fluid pressure of fluid within the vent system and operating the solenoid for a time period associated with the static fluid pressure within the vent system to operate the valve by delivering a predetermined quantity of water through the valve based on the static fluid pressure, wherein dynamic fluid pressure within the vent system is monitored during operation of the valve, and the time period for operation of the solenoid is adjusted based on the dynamic fluid pressure to regulate the quantity of water delivered through the valve during valve operation.

A flush valve for a waste water system, comprising:

• a valve body 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 body and a vent outlet in flow communication with the fluid outlet of the valve body;
• an electronically operated solenoid valve adapted to establish flow communication between the control chamber and the vent outlet so as to selectively vent fluid from the control chamber to the fluid outlet to establish a pressure differential across a portion of the main valve element to permit the main valve element to open for fluid flow between the fluid inlet and the fluid outlet of the valve body, thereby causing operation of the flush valve;
• an actuator adapted for requesting operation of the valve;
• a pressure transducer adapted to sense the static fluid pressure of fluid within the vent system;
• and
• a microprocessor adapted to control operation of the solenoid valve upon receipt of a request for operation from the actuator so as to cause operation of the valve to deliver a predetermined quantity of water through the valve based on the static fluid pressure of fluid within the vent system as sensed by the pressure transducer, wherein the pressure transducer is adapted to monitor dynamic fluid pressure of fluid within the vent system during operation of the valve, and wherein the microprocessor is further adapted to control operation by adjusting the time period of energization of the solenoid based on the monitored dynamic fluid pressure to regulate the quantity of water delivered through the valve during valve operation.