Flow system with pressure level responsive air admission control
First Claim
1. In a 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 a triggered input means for actuating 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 set means coupled to said sewer line downstream of said valve means and responsive to a selected line pressure to actuate the control means and including reset means for resetting the admission control means in response to the opening of the line valve means.
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Accused Products
Abstract
A vacuum operated sewerage system includes a static pressure sensor establishing a trigger signal at selected first level in a standpipe. The sensor is connected upstream of a discharge control valve and actuates a timer at the selected sensed pressure. The timer is connected to actuate the discharge control valve after a suitable time delay to prevent transient signal actuation, and establish flow for a predetermined period. An air admission valve is connected in series with the sensor to the timer to actuate the timer if the system vacuum drops below a selected level in the same manner as an increased hydrostatic pressure. The sensor can be eliminated for separate air admission control directly in response to the vacuum condition of the line.
26 Citations
15 Claims
- 1. In a 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 a triggered input means for actuating 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 set means coupled to said sewer line downstream of said valve means and responsive to a selected line pressure to actuate the control means and including reset means for resetting the admission control means in response to the opening of the line valve means.
- 11. A 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 for opening and closing said sewer line and having a fluid operator, a pilot valve means having a standby position connecting atmospheric pressure to the valve means and an actuated position connecting vacuum pressure to the line valve, a fluid controller means having a triggered input means for actuating said pilot valve means, a pressure sensor connected to said line for sensing accumulation of sewerage, fluid supply means for supplying fluid to said controller and said operator means, an admission control valve means including a high pressure level sensing set valve means having an input signal chamber connected to the sewer line and having valved passageway connected in series with said sensor to said fluid supply means and to said controller means to supply a trigger signal pressure to the controller in response to closing of said valved passageway, said control valve means including a low pressure level sensing reset valve means having an input signal chamber connected to the output of said pilot valve means and having a passageway to by-pass the first valved passageway and operative to remove said trigger signal pressure from said controller, and a fluid time delay means connected between the input chamber of the reset valve means and the pilot valve means.
Specification