Flow system control with time delay override means
First Claim
1. 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.
3 Assignments
0 Petitions
Accused Products
Abstract
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.
-
Citations
12 Claims
- 1. 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.
- 4. In the sewage flow system employing a vacuum source means connected to the downstream end of a sewer line buried in the ground for conducting sewage through the line as a result of pressure and which line may include low accumulating portions, a fluid activated sewer line valve means having an operator means for opening and closing said sewer line, a fluid controller means having an input means for timed actuation of said operator means of said valve means, fluid supply means for supplying fluid to said controller and said operator means, a fluid admission control means connecting said fluid supply means to said controller and including a timed signal means having an input means coupled to said sewer line downstream of said valve means and having a time delay means to limit operation thereof to an input signal of a minimum duration, said input means transmitting said line pressure to said signal means to actuate the control means in response to a selected change in line pressure of said minimum duration, said control means including reset means for resetting the admission control means in response to the opening of the line valve means.
- 9. A sewage flow system employing a vacuum source means connected to the downstream end of at least one sewer line buried in the ground for conducting sewage through the line as a result of pressure and which line may include low accumulating portions, a fluid activated sewer line valve having a pressure responsive pneumatic operator means for opening and closing said sewer line valve, a controller having a pressure responsive input means and a timing means for timed actuation of said operator means in response to a trigger signal of a given minimum time, pneumatic supply means for supplying air to said controller and said operator means, an air admission control means connecting said supply means to said controller and including a pressure responsive trigger valve means coupled to said pressure responsive input means to supply a trigger signal to the controller, said trigger valve means having an input means coupled to said sewer line downstream of said sewer line valve means in series with a time delay means to limit valve operation to an input signal of a minimum duration, vacuum sensing valve means responsive to the line pressure downstream of the line valve means to actuate the time delay means to start the timing cycle, said trigger valve input means transmitting said line pressure to actuate the trigger valve means in response to a selected change in line pressure of said minimum duration, said control means including reset means for resetting the admission control means in response to the opening of the line valve.
Specification