초록 ▼

A vacuum operated sewage system includes a static pressure sensor establishing a trigger signal at a selected first level in a standpipe. The sensor is connected upstream of a discharge control valve and actuates a trigger and timer controller at the selected sensed pressure to establish flow for a

A vacuum operated sewage system includes a static pressure sensor establishing a trigger signal at a selected first level in a standpipe. The sensor is connected upstream of a discharge control valve and actuates a trigger and timer controller at the selected sensed pressure to establish flow for a predetermined period. A separate air admission control is provided to separately actuate the timer controller if the vacuum level in the sewage flow line drops below a selected level, to thereby reset the system vacuum pressure. The air admission control includes a level trigger valve operable to actuate the controller. A by-pass pressure sensing valve has an input connected to sense line pressure and holds the trigger valve in standby until the line pressure drops below a selected vacuum pressure. A resettable fluid timer is also connected to the level trigger valve and is charged under normal pressure system conditions. The timer holds the trigger valve in the set state for a selected period after the by-pass sensing valve responds to system level pressure decreasing below the selected minimum operating pressure and thereby prevents response to momentary changes in the flow line vacuum level.

대표청구항 ▼

A sewerage flow control system having an accumulating means for storing of sewerage and means for establishing a predetermined differential pressure in a line connected to said accumulating means and to said collector means and having a normally closed main valve means in said line upstream of said

A sewerage flow control system having an accumulating means for storing of sewerage and means for establishing a predetermined differential pressure in a line connected to said accumulating means and to said collector means and having a normally closed main valve means in said line upstream of said collector means for deliverying of accumulated fluid medium to said collector means, comprising a controller having sensing means to sense the pressure condition upstream of said valve means and having valve control means actuated by said sensing means for selectively opening said normally closed valve means to apply said pressure to the opposite side of the valve means and to establish a predetermined flow cycle for delivery of said fluid medium, and pressure control means to sense the pressure in the downstream side of the valve means with the valve means closed and connected to actuate said valve control means of said controller to open said valve means to initiate said flow cycle in response to an abnormal pressure condition between the valve means and the collector means and operating independently of the sensing means, and said pressure control means including a time delay means to restrict the response thereof to a time period in excess of transient abnormal pressure condition created between the valve means and the source means, whereby said valve control means is independently actuated by said sensing means and by said pressure control means.